CN115107942B - A method and system for constructing an offshore floating wind turbine foundation structure and its model - Google Patents

Abstract

The invention discloses a construction method and a construction system of an offshore floating fan foundation structure and a model thereof, and relates to the technical field of offshore wind power structures.A super-high-performance concrete representative body element model is established on a material scale so as to obtain the yield behavior of super-high-performance concrete, and a super-high-performance concrete honeycomb structure representative body element model is established on a component scale so as to obtain the yield behavior of the super-high-performance concrete honeycomb structure; the yield parameters are obtained through the yield behavior of the ultra-high performance concrete and the yield behavior of the ultra-high performance concrete honeycomb structure to construct a continuous medium equivalent model with a homogenized honeycomb structure, and the continuous medium equivalent model with the homogenized honeycomb structure is applied to bearing calculation and strength check of an offshore floating fan foundation structure model, so that multi-scale coupling of ultra-high performance concrete, the honeycomb structure and the fan foundation structure is realized, and the optimal design of the offshore floating fan foundation structure model is realized.

Description

A method and system for constructing an offshore floating wind turbine foundation structure and its model

Technical Field

The present invention relates to the technical field of offshore wind power structures, and in particular to an offshore floating wind turbine foundation structure and a construction method and system for its model.

Background technique

Offshore wind turbines are the main means to achieve offshore renewable energy development. Floating wind turbine foundation structures can be used in relatively deep waters near the coast (generally the water depth is greater than 50 meters), and have important industrial value. The main components of the traditional floating wind turbine foundation structure include pontoons, connecting beams and support trusses, all of which are welded steel structures. The current steel price is extremely high, the welding process is expensive and the construction carbon emissions are extremely high. In addition, steel structures are prone to corrosion in the marine environment. Therefore, the comprehensive cost of traditional floating wind turbine foundation structures is extremely high and cannot be put into industrial application. Reinforced concrete structures have low material and process costs and relatively good corrosion resistance, but the concrete itself has low strength. In order to achieve the bearing performance of steel structures, the required concrete structure volume is large, which is not conducive to offshore towing construction. The proportion of steel bars needs to be increased, which increases the cost of steel bar binding process, and general concrete structures still have certain corrosion problems.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides a method and system for constructing an offshore floating wind turbine foundation structure and a model thereof.

The present invention achieves the above technical objectives through the following technical means.

An offshore floating wind turbine foundation structure comprises a hollow star-shaped buoyancy support and a central column arranged at the center of the star-shaped buoyancy support;

An ultra-high performance concrete honeycomb structure is embedded in the hollow portion of the star-shaped buoyancy support, so that the floating foundation structure can provide support and buoyancy for the wind turbine.

A method for constructing an offshore floating wind turbine foundation structure model comprises the following steps:

Step 1: Establish a representative volume element model of ultra-high performance concrete, apply periodic boundary conditions and perform finite element analysis to obtain the yield behavior of the ultra-high performance concrete; based on the yield behavior of the ultra-high performance concrete, obtain the target yield behavior of the ultra-high performance concrete;

Step 2: Establish a representative volume element model of the ultra-high performance concrete honeycomb structure, apply periodic boundary conditions and perform finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb structure, and determine the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure based on the yield behavior of the ultra-high performance concrete honeycomb structure, which is used for strength judgment in the strength verification of the offshore floating wind turbine foundation structure model;

Step three: Based on the target yield behavior of the ultra-high performance concrete, the target yield behavior of the ultra-high performance concrete honeycomb structure is obtained to obtain yield parameters, a continuous medium equivalent model of the honeycomb structure is constructed, and the continuous medium equivalent model of the honeycomb structure is applied to the load calculation and strength verification of the offshore floating wind turbine foundation structure model; the continuous medium equivalent model of the honeycomb structure is homogenized, including elastic parameters and yield parameters, wherein the elastic parameter is the elastic modulus, and the yield parameter is the yield stress and the yield surface.

Furthermore, in the step 1, a method of establishing a representative volume element model of ultra-high performance concrete, applying periodic boundary conditions and performing finite element analysis to obtain a target yield behavior of ultra-high performance concrete includes:

Establish a representative volume element model of ultra-high performance concrete;

Applying periodic boundary conditions to the representative volume element model of the ultra-high performance concrete and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete;

Different yield points of the ultra-high performance concrete are obtained according to different force-displacement curves of the ultra-high performance concrete, and target yield behaviors of the ultra-high performance concrete are obtained based on the different yield points of the ultra-high performance concrete.

Furthermore, in the step 2, a representative volume element model of the ultra-high performance concrete honeycomb structure is established, periodic boundary conditions are applied and finite element analysis is performed to obtain the yield behavior of the ultra-high performance concrete honeycomb structure, including:

Establish a representative volume element model of ultra-high performance concrete honeycomb structure;

Applying periodic boundary conditions to the representative volume element model of the ultra-high performance concrete honeycomb structure and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete honeycomb structure;

Different yield points are obtained according to different force-displacement curves of the ultra-high performance concrete honeycomb structure, and the yield behavior of the ultra-high performance concrete honeycomb structure is obtained based on the different yield points.

Furthermore, in the step 2, based on the yield behavior of the ultra-high performance concrete honeycomb structure, the method for determining the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure includes:

Establish a numerical model of ultra-high performance concrete honeycomb sandwich beams;

The elastic foundation constraint was applied to the bottom of the numerical model of the ultra-high performance concrete honeycomb sandwich beam and the uniformly distributed load was applied to the top. Finite element analysis was performed to obtain the yield behavior of the ultra-high performance concrete honeycomb sandwich beam.

Based on the yield behavior of UHPC honeycomb sandwich beams and the stress field characteristics under typical load-bearing states of UHPC honeycomb structures, the target yield behavior of UHPC honeycomb in the sandwich structure is determined.

Furthermore, in the step 3, the target yield behavior of the ultra-high performance concrete honeycomb structure is obtained based on the target yield behavior of the ultra-high performance concrete, and the method for constructing a continuous medium equivalent model of a homogenized honeycomb structure includes:

The target yield behavior of the ultra-high performance concrete honeycomb structure is obtained according to the target yield behavior of the ultra-high performance concrete, and the force-displacement curves of the compression sections of the ultra-high performance concrete honeycomb structure in the x, y, and z directions and the force-displacement curve of the shear force in the vertical direction are calculated and determined;

The force-displacement curve is converted into a stress-strain curve, and the elastic modulus and yield stress of the ultra-high performance concrete honeycomb structure are calculated by the stress-strain curve;

The yield stress and elastic modulus in each direction are input into ABAQUS, and the calculation can be performed to replace the honeycomb structure with a homogenized solid unit to obtain a homogenized equivalent continuous medium model of the honeycomb structure.

A system for constructing an offshore floating wind turbine foundation structure model, comprising:

The first target yield behavior calculation unit is used to establish a representative volume element model of ultra-high performance concrete, apply periodic boundary conditions and perform finite element analysis to obtain the yield behavior of the ultra-high performance concrete; based on the yield behavior of the ultra-high performance concrete, obtain the target yield behavior of the ultra-high performance concrete;

The second target yield behavior calculation unit is used to establish a representative volume element model of the ultra-high performance concrete honeycomb structure, apply periodic boundary conditions and perform finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb structure, and determine the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure based on the yield behavior of the ultra-high performance concrete honeycomb structure;

A model building unit, which obtains the target yield behavior of the ultra-high performance concrete honeycomb structure based on the target yield behavior of the ultra-high performance concrete, obtains yield parameters, and builds a continuous medium equivalent model of the homogenized honeycomb structure;

The model load calculation and strength verification unit applies the continuous medium equivalent model with homogenized honeycomb structure to the offshore floating wind turbine foundation structure model, and implements load calculation and strength verification.

In the above technical solution, the first target yield behavior calculation unit is specifically used to:

Establish a representative volume element model of ultra-high performance concrete;

Applying periodic boundary conditions to the representative volume element model of the ultra-high performance concrete and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete;

Different yield points of the ultra-high performance concrete are obtained according to different force-displacement curves of the ultra-high performance concrete, and target yield behaviors of the ultra-high performance concrete are obtained based on the different yield points of the ultra-high performance concrete.

In the above technical solution, the second target yield behavior calculation unit is specifically used for:

Establish a representative volume element model of ultra-high performance concrete honeycomb structure;

Applying periodic boundary conditions to the representative volume element model of the ultra-high performance concrete honeycomb structure and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete honeycomb structure;

Different yield points are obtained according to different force-displacement curves of the ultra-high performance concrete honeycomb structure, and the yield behavior of the ultra-high performance concrete honeycomb structure is obtained based on the different yield points.

In the above technical solution, the second target yield behavior calculation unit is further specifically used for:

Establish a numerical model of ultra-high performance concrete honeycomb sandwich beams;

The elastic foundation constraint was applied to the bottom of the numerical model of the ultra-high performance concrete honeycomb sandwich beam and the uniformly distributed load was applied to the top. Finite element analysis was performed to obtain the yield behavior of the ultra-high performance concrete honeycomb sandwich beam.

Based on the yield behavior of UHPC honeycomb sandwich beams and the stress field characteristics under typical load-bearing states of UHPC honeycomb structures, the target yield behavior of UHPC honeycomb in the sandwich structure is determined.

The beneficial effects of the present invention are:

(1) The present invention provides an offshore floating wind turbine foundation structure, including a star-shaped buoyancy support and a central column. By coupling an ultra-high performance concrete honeycomb structure to the star-shaped buoyancy support, the foundation structure has the characteristics of lighter weight, better mechanical properties, and less corrosion compared to the previous pontoon-type design.

(2) The present invention provides a method and system for constructing an offshore floating wind turbine foundation structure model. At the material scale, a representative volume element model of ultra-high performance concrete is established to obtain the target yield behavior of the ultra-high performance concrete. At the component scale, a representative volume element model of the ultra-high performance concrete honeycomb structure is established to obtain the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure. The yield behavior of the ultra-high performance concrete honeycomb structure is obtained through the yield behavior of the ultra-high performance concrete, and then a continuous medium equivalent model of the homogenized honeycomb structure is constructed. The continuous medium equivalent model of the homogenized honeycomb structure is applied to the load calculation and strength verification of the offshore floating wind turbine foundation structure model, thereby realizing the multi-scale coupling of the ultra-high performance concrete, the honeycomb structure, and the wind turbine foundation structure, and realizing the optimized design of the offshore floating wind turbine foundation structure model.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

FIG1 is a schematic diagram of the offshore floating wind turbine foundation structure provided by Example 1 of the present invention;

FIG2 is a schematic flow chart of a method for constructing an offshore floating wind turbine foundation structure model provided in Example 2 of the present invention;

FIG. 3 is a schematic diagram of a representative model structure of an ultra-high performance concrete element provided in Example 2 of the present invention.

FIG4 is a schematic diagram of a representative model of an ultra-high performance concrete honeycomb structure element provided in Example 2 of the present invention;

FIG5 is a schematic diagram of a single cell structure RVE of a honeycomb structure provided in Example 2 of the present invention;

FIG6 is a schematic diagram of a honeycomb structure sandwich beam provided in Example 2 of the present invention;

FIG7 is a stress-strain curve of ultra-high performance concrete provided in Example 2 of the present invention;

FIG8 is a system block diagram of the same construction of the offshore floating wind turbine foundation structure model provided in Example 3 of the present invention;

In the attached drawings, 1-star-shaped buoyancy support, 2-center column.

Detailed ways

The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

Example 1

As shown in FIG1 , an embodiment of the present invention provides an offshore floating wind turbine foundation structure, comprising a hollow star-shaped buoyancy support 1 and a central column 2 disposed at the center of the star-shaped buoyancy support 1;

An ultra-high performance concrete honeycomb structure is embedded in the hollow portion of the star-shaped buoyancy support 1, so that the floating wind turbine foundation structure can provide support and buoyancy for the wind turbine.

In the embodiment of the present invention, the offshore floating wind turbine foundation structure is distributed in a star shape, and vertical axis wind turbines are set up at the ends of the branches of the star-shaped buoyancy support 1. Compared with the traditional wind turbine foundation structure, the offshore buoyancy wind turbine foundation structure provided by the present invention is farther from the shore, can be used in water depths of more than 50m, and has a wider range of adaptability.

It should be noted that in actual use, each branch of the star-shaped buoyancy support 1 is very long and bears the impact of waves, which puts forward high requirements on its shear and compression resistance. According to previous designs, the branches are mostly designed as hollow pontoon boxes. In the embodiment of the present invention, the hollow part of the branch is embedded with a lightweight ultra-high performance concrete honeycomb structure, which retains the excellent mechanical properties of ultra-high performance concrete and is lightweight enough. The concrete is not corrosive, which greatly reduces the subsequent maintenance costs. Therefore, the offshore floating wind turbine foundation structure coupled with the ultra-high performance concrete honeycomb structure of the present invention has great application prospects in the future.

Example 2

As shown in FIG. 2 , FIG. 2 is a flow chart of a method for constructing an offshore floating wind turbine foundation structure model provided in this embodiment, and the method includes the following steps:

Step 1: Establish a representative volume element model of ultra-high performance concrete, apply periodic boundary conditions and perform finite element analysis to obtain the target yield behavior of ultra-high performance concrete;

Specifically, first, as shown in FIG3 , a representative volume element model (RVE) of ultra-high performance concrete is established. For example, the model is a cubic block, the volume element size is determined according to the Hill criterion, and steel fibers with a length of 8 mm and a cross-sectional diameter of 0.12 mm and spherical aggregates with a diameter of 1 mm are embedded in a common node manner;

Secondly, periodic boundary conditions are applied to the representative volume element model of ultra-high performance concrete. Since the representative volume element of ultra-high performance concrete characterizes the characteristics of the entire ultra-high performance concrete through a small-sized model, and the accuracy of the characterization requires the control of periodic boundary conditions, therefore, in actual situations, a small-sized part of a normal-sized concrete block will inevitably be affected by the surrounding concrete during the stress process, and periodic boundary conditions can characterize this interaction. Therefore, periodic boundary conditions are applied to the representative volume element model of ultra-high performance concrete to ensure the accuracy of the calculation results obtained through the representative volume element;

Then, a displacement load is applied to any direction of the representative volume element model of ultra-high performance concrete to make it yield. The yield is characterized by the force-displacement curve, which can fully characterize the evolution of concrete from elasticity, yield to plasticity. The inflection point in the force-displacement curve is the yield point. By applying different loads to the concrete in two directions at the same time, different yield points are obtained. By converting the force-displacement curve into a stress-strain curve, the yield behavior of ultra-high performance concrete (i.e., the yield surface of ultra-high performance concrete) and the yield criterion corresponding to the yield surface can be obtained. The yield behavior of ultra-high performance concrete obtained here is the target yield behavior required.

Further, based on the above embodiment, the umat subroutine based on ABAQUS is written through the yield behavior of ultra-high performance concrete and the stress-strain curve of ultra-high performance concrete measured experimentally. Among them, although the ultra-high performance concrete can be characterized by writing CDP through the constitutive model that comes with ABAQUS, the damage characterization of ultra-high performance concrete by umat is more detailed and can improve the calculation efficiency. Therefore, the umat subroutine is used here to characterize the yield behavior of ultra-high performance concrete, that is, the target yield behavior of ultra-high performance concrete required.

Step 2: Establish a representative volume element model of the ultra-high performance concrete honeycomb structure, apply periodic boundary conditions and perform finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb structure. Consider the anisotropy of the ultra-high performance concrete honeycomb structure, and determine the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure based on the yield behavior of the ultra-high performance concrete honeycomb structure. This is used for strength verification of the offshore floating wind turbine foundation structure model. The target yield behavior refers to the yield characteristics of the honeycomb in the sandwich structure. The yield characteristics of the honeycomb will vary for different structures. Based on the target yield behavior of the ultra-high performance concrete in step 1, the target yield behavior of the ultra-high performance concrete honeycomb structure is obtained, and a homogenized equivalent continuous medium model of the ultra-high performance concrete honeycomb structure is constructed.

Specifically, first, as shown in FIG4 , a representative volume element model of an ultra-high performance concrete honeycomb structure is established. Exemplarily, the overall size of the representative volume element model of the ultra-high performance concrete honeycomb structure is determined according to the Hill criterion, and the size of a unit cell ( FIG5 ) of the honeycomb structure is determined according to the overall size of the fan;

Secondly, periodic boundary conditions are imposed on the representative volume element model of ultra-high performance concrete honeycomb structure;

Then, a displacement load is applied in any direction of the representative volume element model of the ultra-high performance concrete honeycomb structure to make it yield. The yield is also represented by the force-displacement curve. The inflection point of the force-displacement curve is also selected as the yield point. By applying different loads in two directions of the representative volume element model of the ultra-high performance concrete honeycomb structure at the same time, different yield points are obtained. The force-displacement curve is converted into a stress-strain curve, and the yield behavior of the ultra-high performance concrete honeycomb structure can be obtained.

Since the mechanical behavior of the ultra-high performance concrete honeycomb structure is anisotropic, the yield behavior in different directions is different. Theoretically, there are three two-dimensional yield surfaces for tension. At the same time, the shear resistance of the ultra-high performance concrete honeycomb structure in different directions must also be considered. Therefore, the yield behavior of the ultra-high performance concrete honeycomb structure obtained above is not the required target yield behavior.

Furthermore, in order to obtain the target yield behavior, it is necessary to analyze the stress conditions of the ultra-high performance concrete honeycomb structure in actual situations. As shown in Figure 6, a numerical model of the ultra-high performance concrete honeycomb sandwich beam is established in the finite element software, and the model is subjected to mechanical analysis and calculation; specifically, the ultra-high performance concrete honeycomb sandwich beam is treated as a simply supported beam, that is, one end of the ultra-high performance concrete honeycomb sandwich beam is fixedly restrained, while the other end is free from the degree of freedom in the direction of the sandwich beam, and an elastic foundation constraint is applied to the bottom of the sandwich beam. It should be noted that the unit area foundation stiffness coefficient of the foundation constraint is 0.3, and a uniformly distributed load is applied to the top of the ultra-high performance concrete honeycomb sandwich beam. It can be obtained from the calculation results that the honeycomb structure in the ultra-high performance concrete honeycomb sandwich beam is mainly subjected to the shear force in the vertical direction of the sandwich beam (i.e. the shear force in the y direction) and the pressure in the three directions of the sandwich beam, i.e. the pressure in the x, y and z directions, thereby determining the actual stress condition of the ultra-high performance concrete honeycomb sandwich beam, that is, the yield behavior of the ultra-high performance concrete honeycomb sandwich beam. Based on the yield behavior of the honeycomb sandwich beam and according to the stress field characteristics under the typical load-bearing state of the ultra-high performance concrete honeycomb structure, the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure is determined, wherein the target yield behavior is specifically the yield criterion under compressive stress and compression-shear combined stress.

Since the mechanical analysis and calculation of the ultra-high performance concrete honeycomb sandwich beam has been carried out, the stress condition of the middle honeycomb plate is clear, that is, the shear force in the vertical direction of the ultra-high performance concrete honeycomb sandwich beam (i.e., the shear force in the y direction) and the pressure in the three directions of the sandwich beam (i.e., the pressure in the x, y, and z directions) are clear, and the force-displacement curve or stress-strain curve of the ultra-high performance concrete in the compression section and the tension section is completely different, as shown in Figure 7. According to the method of obtaining the target yield behavior of ultra-high performance concrete in step 1, the target yield behavior of the ultra-high performance concrete honeycomb structure is obtained, and then the force in the compression section of the ultra-high performance concrete honeycomb structure in three directions is obtained. -displacement curve and the force-displacement curve of shear force in the vertical direction, and then convert the force-displacement curve into a stress-strain curve; the inflection point in the force-displacement curve is the yield point, and the stress value corresponding to the yield point is the yield stress in different directions of the ultra-high performance concrete honeycomb structure; the elastic modulus of the ultra-high performance concrete honeycomb structure in different directions (that is, the slope of the elastic section of the stress-strain curve) is calculated through the stress-strain curve, and the above elastic modulus and the yield stress in each direction are input into ABAQUS to implement the calculation, replacing the honeycomb structure with a homogenized solid unit, thereby obtaining a homogenized equivalent continuous medium model of the ultra-high performance concrete honeycomb.

Step 3: Apply the homogenized equivalent continuous medium model to the load calculation and strength verification of the offshore floating wind turbine foundation structure model;

Although the target yield behavior of the required ultra-high performance concrete and ultra-high performance concrete honeycomb structure can be accurately described, due to the huge size of the floating wind turbine, the length of one branch can reach 40m. If the honeycomb structure sandwich beam solid model is directly used, the calculation efficiency, accuracy and convergence are difficult to guarantee. Therefore, when the homogenized equivalent continuous medium model of the ultra-high performance concrete honeycomb structure obtained in step 2 is used to construct the floating wind turbine finite element model, the ultra-high performance concrete honeycomb structure layer is replaced by the above-mentioned equivalent continuous medium, and the floating wind turbine foundation structure bearing calculation and strength verification are performed. If the equivalent medium shows the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure described in step 2 during the model calculation process, it can be judged that the structural strength is insufficient. At this time, adjust the material composition or honeycomb structure parameters, or adjust the material composition and honeycomb structure parameters at the same time, and re-implement steps 1 and 2 to achieve material-component-structure multi-scale coupling optimization.

In summary, the embodiment of the present invention provides a method for constructing an offshore floating wind turbine foundation structure model based on an ultra-high performance concrete honeycomb structure. At the material scale, a representative volume element model of ultra-high performance concrete is established to obtain the target yield behavior of ultra-high performance concrete. At the component scale, a representative volume element model of ultra-high performance concrete honeycomb structure is established to obtain the target yield behavior of ultra-high performance concrete honeycomb in the sandwich structure; the target yield behavior of ultra-high performance concrete honeycomb structure is obtained through the target yield behavior of ultra-high performance concrete, and then a continuous medium equivalent model of honeycomb structure homogenization is constructed, wherein the continuous medium equivalent model of honeycomb structure homogenization includes elastic parameters and yield parameters, wherein the elastic parameters are elastic modulus, and the yield parameters are yield stress and yield surface; the continuous medium equivalent model of honeycomb structure homogenization is applied to the load calculation and strength verification of the offshore floating wind turbine foundation structure model, thereby realizing the multi-scale coupling of ultra-high performance concrete, honeycomb structure, and wind turbine foundation structure, and realizing the optimization design of the offshore floating wind turbine foundation structure model. The sandwich beam structure based on ultra-high performance concrete honeycomb structure in the present invention has the characteristics of lighter weight, better mechanical properties, and less corrosion than the previous pontoon design. Specifically, the floating wind turbine foundation structure is a star-shaped structure, and each branch is very long and bears the impact of waves, which puts high requirements on its shear and compression resistance. According to previous designs, the branches are mostly hollow pontoon-type designs, so lightweight ultra-high performance concrete honeycombs are embedded in the hollow part. While retaining the excellent mechanical properties of ultra-high performance concrete, it is lightweight enough, and the concrete is non-corrosive, which greatly reduces the subsequent maintenance costs. Therefore, the multi-scale coupled offshore floating wind turbine foundation structure of ultra-high performance concrete honeycombs and wind turbine foundation structures provided by the present invention has great application prospects in the future.

Example 3

As shown in FIG8 , FIG8 is a system block diagram of a system for constructing an offshore floating wind turbine foundation structure model provided in this embodiment, and the system shown includes:

The first target yield behavior calculation unit is used to establish a representative volume element model of ultra-high performance concrete, impose periodic boundary conditions and perform finite element analysis to obtain the target yield behavior of ultra-high performance concrete;

The second target yield behavior calculation unit is used to establish a representative volume element model of the ultra-high performance concrete honeycomb structure, apply periodic boundary conditions and perform finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb structure, and determine the target yield behavior of the ultra-high performance concrete honeycomb structure based on the yield behavior of the ultra-high performance concrete honeycomb structure;

A model building unit, which obtains yield parameters based on the target yield behavior of the ultra-high performance concrete and the target yield behavior of the ultra-high performance concrete honeycomb structure, and builds a continuous medium equivalent model of a homogenized honeycomb structure;

The model load calculation and strength verification unit applies the continuous medium equivalent model with homogenized honeycomb structure to the offshore floating wind turbine foundation structure model, and implements load calculation and strength verification.

A system for constructing an offshore floating wind turbine foundation structure model provided in an embodiment of the present invention and a method for constructing an offshore floating wind turbine foundation structure model provided in the aforementioned embodiment are based on the same inventive concept. Therefore, the more detailed working principles of each unit in the embodiment of the present invention can be referred to the aforementioned embodiment and will not be repeated here.

Based on the same inventive concept as a method for constructing an offshore floating wind turbine foundation model, the present application also provides an electronic device, which includes one or more processors and one or more memories, wherein a computer-readable code is stored in the memory, wherein the computer-readable code, when executed by one or more processors, implements the method for constructing an offshore floating wind turbine foundation model. Among them, the memory may include a non-volatile storage medium and an internal memory; the non-volatile storage medium may store an operating system and a computer-readable code. The computer-readable code includes program instructions, which, when executed, enable the processor to execute any method for constructing an offshore floating wind turbine foundation model. The processor is used to provide computing and control capabilities to support the operation of the entire electronic device. The memory provides an environment for the operation of the computer-readable code in the non-volatile storage medium, and when the computer-readable code is executed by the processor, the processor can execute any method for constructing an offshore floating wind turbine foundation model.

It should be understood that the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

A computer-readable storage medium is also provided in an embodiment of the present application. The computer-readable storage medium stores a computer-readable code. The computer-readable code includes program instructions. The processor executes the program instructions to implement the method for constructing an offshore floating wind turbine foundation structure model of the present application.

The computer-readable storage medium may be an internal storage unit of the electronic device described in the aforementioned embodiment, such as a hard disk or memory of the computer device. The computer-readable storage medium may also be an external storage device of the electronic device, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims (9)

1. The construction method of the offshore floating type fan foundation structure model is characterized by being based on an offshore floating type fan foundation structure, wherein the offshore floating type fan foundation structure comprises a hollow star-shaped buoyancy support and a central upright post arranged in the center of the star-shaped buoyancy support, and an ultra-high-performance concrete honeycomb structure is embedded in the hollow part of the star-shaped buoyancy support so that the floating type foundation structure can provide support and buoyancy for a fan;

The construction method comprises the following steps:

Step one: establishing an ultra-high performance concrete representative body element model, applying periodic boundary conditions and carrying out finite element analysis to obtain the yield behavior of the ultra-high performance concrete; obtaining a target yield behavior of the ultra-high performance concrete based on the yield behavior of the ultra-high performance concrete;

Step two: establishing an ultra-high performance concrete honeycomb structure representative body element model, applying periodic boundary conditions and carrying out finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb structure, and determining the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure based on the yield behavior of the ultra-high performance concrete honeycomb structure for strength judgment in strength check of an offshore floating fan foundation structure model;

Step three: obtaining the target yield behavior of the ultra-high performance concrete honeycomb structure based on the target yield behavior of the ultra-high performance concrete, constructing a continuous medium equivalent model with a uniform honeycomb structure, and applying the continuous medium equivalent model with the uniform honeycomb structure to bearing calculation and strength check of an offshore floating fan foundation structure model; the continuous medium equivalent model for homogenizing the honeycomb structure comprises an elastic parameter and a yield parameter, wherein the elastic parameter is elastic modulus, and the yield parameter is yield stress and yield surface.

2. The method for constructing a model of a floating offshore wind turbine foundation structure according to claim 1, wherein in the first step, a model of a representative body element of ultra-high performance concrete is established, periodic boundary conditions are applied and finite element analysis is performed, and the method for obtaining the target yield behavior of the ultra-high performance concrete comprises:

Establishing an ultra-high performance concrete representative voxel model;

Applying periodic boundary conditions to the ultra-high performance concrete representative body element model and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete;

and obtaining different yield points of the ultra-high performance concrete according to different force-displacement curves of the ultra-high performance concrete, and obtaining the target yield behavior of the ultra-high performance concrete based on the different yield points of the ultra-high performance concrete.

3. The method for constructing a model of an offshore floating wind turbine foundation according to claim 1, wherein in the second step, a model of a representative element of an ultra-high performance concrete honeycomb structure is established, periodic boundary conditions are applied and finite element analysis is performed, and the method for obtaining yield behavior of the ultra-high performance concrete honeycomb structure comprises:

Establishing an ultra-high performance concrete honeycomb structure representative voxel model;

Applying periodic boundary conditions to the ultra-high performance concrete honeycomb structure representative body element model and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete honeycomb structure;

And obtaining different yield points according to different force-displacement curves of the ultra-high performance concrete honeycomb structure, and obtaining the yield behavior of the ultra-high performance concrete honeycomb structure based on the different yield points.

4. A method of constructing a model of an offshore floating wind turbine foundation according to claim 3, wherein in step two, the method of determining the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure based on the yield behavior of the ultra-high performance concrete honeycomb structure comprises:

Establishing a numerical model of the ultra-high performance concrete honeycomb sandwich beam;

applying elastic foundation constraint to the bottom of a numerical model of the ultra-high performance concrete honeycomb sandwich beam, uniformly distributing load to the top of the numerical model, and performing finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb sandwich beam;

Based on the yield behavior of the ultra-high performance concrete honeycomb sandwich beam, determining the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure according to the stress field characteristics of the ultra-high performance concrete honeycomb structure in a typical bearing state.

5. The method for constructing a model of an offshore floating wind turbine foundation structure according to claim 1, wherein in the third step, the target yield behavior of the ultra-high performance concrete honeycomb structure is obtained based on the target yield behavior of the ultra-high performance concrete, and the method for constructing a continuous medium equivalent model for homogenizing the honeycomb structure comprises the following steps:

obtaining the target yield behavior of the ultra-high-performance concrete honeycomb structure according to the target yield behavior of the ultra-high-performance concrete, and calculating and determining a force-displacement curve of a compression section in the x, y and z directions and a force-displacement curve of shearing force in the vertical direction of the ultra-high-performance concrete honeycomb structure;

Converting the force-displacement curve into a stress-strain curve, and calculating the elastic modulus and the yield stress of the ultra-high performance concrete honeycomb structure through the stress-strain curve;

the yield stress and the elastic modulus in each direction are input into ABAQUS, and calculation can be implemented to replace the honeycomb structure with the homogenized entity unit, so as to obtain the homogenized equivalent continuous medium model of the honeycomb structure.

6. A system for constructing a model of an offshore floating wind turbine foundation structure, comprising:

The first target yield behavior calculation unit is used for establishing an ultra-high performance concrete representative body element model, applying periodic boundary conditions and carrying out finite element analysis to obtain yield behavior of the ultra-high performance concrete; obtaining a target yield behavior of the ultra-high performance concrete based on the yield behavior of the ultra-high performance concrete;

The second target yield behavior calculation unit is used for establishing a representative voxel model of the ultra-high-performance concrete honeycomb structure, applying periodic boundary conditions and carrying out finite element analysis to obtain the yield behavior of the ultra-high-performance concrete honeycomb structure, and determining the target yield behavior of the ultra-high-performance concrete honeycomb in the sandwich structure based on the yield behavior of the ultra-high-performance concrete honeycomb structure;

the model construction unit is used for obtaining the target yield behavior of the ultra-high-performance concrete honeycomb structure based on the target yield behavior of the ultra-high-performance concrete and constructing a continuous medium equivalent model for homogenizing the honeycomb structure;

And the model bearing calculation and strength check unit applies the continuous medium equivalent model with the uniform honeycomb structure to the offshore floating fan foundation structure model and carries out bearing calculation and strength check.

7. The system for constructing an offshore floating wind turbine foundation structure model of claim 6, wherein the first target yield behavior calculation unit is specifically configured to:

Establishing an ultra-high performance concrete representative voxel model;

Applying periodic boundary conditions to the ultra-high performance concrete representative body element model and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete;

and obtaining different yield points of the ultra-high performance concrete according to different force-displacement curves of the ultra-high performance concrete, and obtaining the target yield behavior of the ultra-high performance concrete based on the different yield points of the ultra-high performance concrete.

8. The system for constructing an offshore floating wind turbine foundation structure model of claim 6, wherein the second target yield behavior calculation unit is specifically configured to:

Establishing an ultra-high performance concrete honeycomb structure representative voxel model;

Applying periodic boundary conditions to the ultra-high performance concrete honeycomb structure representative body element model and applying different displacement loads in any two directions to obtain different force-displacement curves of the ultra-high performance concrete honeycomb structure;

And obtaining different yield points according to different force-displacement curves of the ultra-high performance concrete honeycomb structure, and obtaining the yield behavior of the ultra-high performance concrete honeycomb structure based on the different yield points.

9. The system for constructing an offshore floating wind turbine foundation structure model of claim 8, wherein the second target yield behavior calculation unit is further specifically configured to:

Establishing an ultra-high performance concrete honeycomb sandwich beam ground numerical model;

Applying elastic foundation constraint to the bottom of the ultra-high performance concrete honeycomb sandwich beam ground numerical model, applying uniform load to the top of the ultra-high performance concrete honeycomb sandwich beam ground numerical model, and performing finite element analysis to obtain the yield behavior of the ultra-high performance concrete honeycomb sandwich beam;

Based on the yield behavior of the ultra-high performance concrete honeycomb sandwich beam, determining the target yield behavior of the ultra-high performance concrete honeycomb in the sandwich structure according to the stress field characteristics of the ultra-high performance concrete honeycomb structure in a typical bearing state.