Cable-Bridge Presentation

RVS COLLEGE OF ENGINEERING & TECHNOLOGY
Jamshedpur
Mini Project
CABLE-STAYED BRIDGE
Introduction
What is a Cable-Stayed Bridge ?
Its a bridge form in which the weight of the deck is supported

by a number of nearly straight diagonal cables in tension
running directly to one or more vertical towers.
The cable-stayed bridge is optimal for spans longer than

cantilever bridges and shorter than suspension bridges. This is
the range within which cantilever bridges would rapidly grow
heavier, and suspension bridge cabling would be more costly.
History
Talking about the history of the concept?
Cable-stayed bridges were being designed and constructed by the late

16th century.
Cable-stayed designs fell from favor in the early 20th century as larger
gaps were bridged using pure suspension designs, and shorter ones
using various systems built of reinforced concrete.
DIMENSION
Dimensions of the model
Height of the bridge : 1000mm

clear distance between the deck
and the ground : 200mm
width of the deck: 250mm
total span of the bridge: 1400mm
free span (distance between two
piers): 900mm
Working System
In a nutshell, the working principle of a cable-stayed bridge can be explained as being the
balanced transfer of all the forces and tensions.
In cable-stayed bridges, the load on the bridge creates vertically downward-acting stress.
This stress gets converted to tensile forces, acting on several cables which are attached at
regular intervals along the span of the bridge’s deck. All these cables are further attached
to a central pillar or tower.
They transfer their tension to the pillar in the form of compressive load.
The pillar must also be strong enough to overcome the shearing stress applied by the
cables pulling at it laterally. Thus, for this system to work, a balance needs to be
established between all these tensile and compressive forces.
MATERIALS TO BE USED
Cable-stayed bridges can be constructed using various materials, including:
Concrete: This is the most common material used to construct cable-stayed
bridges.
Steel: Steel is often used in combination with concrete to increase the strength and
stability of the bridge.
Composite materials: Composite materials such as fibre-reinforced polymers (FRP)
can also be used to construct cable-stayed bridges. These materials offer
advantages such as high strength-to-weight ratios and resistance to corrosion.
Prestressed concrete: This type of concrete is used to increase the strength and
stability of the bridge by applying tension to the concrete before it sets.
Sub-parts of the concept
Design: Cable-stayed bridges have a unique design that consists of a tall tower and a
deck supported by cables attached directly to the tower.
Cable system: The bridge deck is supported by several cables, each connected at one
end to the tower and the other end to the deck. The cable system provides the
primary structural support for the bridge.
Tall towers: Cable-stayed bridges are characterised by tall towers that support the
cables and transfer loads from the deck to the foundations.
Long spans: Cable-stayed bridges can span long distances, making them ideal for
crossing extensive waterways or valleys.
Load distribution: The cable system distributes the load evenly between the tower
and the deck, reducing the stress on each component.
Versatility: Cable-stayed bridges can be designed in various shapes and
configurations to suit the specific needs of each project.
Aesthetic appeal: The towers and cables of cable-stayed bridges often create an
aesthetically pleasing structure.
Advantages
Cable-stayed bridges take less time to complete than other options.
It can be significantly cheaper to build a cable-stayed bridge.
Cable-stayed bridges can be constructed to almost any length.
The design of the cable-stayed bridge supports itself.
The design is that the cables hold the deck by connecting it directly to the
support pillars instead of using suspending wires or cables to stabilize the
span.
A cable-stayed bridge is suitable for light rail as well. Engineers use this option
when a span must be longer than what a cantilever bridge can support
because of its weight, yet it is also short enough so that a suspension bridge is
not the most practical option.
DISAdvantages
This design option can become unstable in specific environments.
Cable-stayed bridges can be challenging to inspect and repair.
It is a design that can sometimes be susceptible to rust or corrosion.
Most of the cable-stayed bridges that are built today use a combination of concrete and steel to
create a rigid, supportive structure. Unless there are protections in place that maintain the
quality of the metals used for the span, the support cables can be highly susceptible to corrosion
and rust.
A cable-stayed bridge can be built in different variations:
A side-spar cable-stayed bridge: has only one tower and is supported only on one
side. One bridge built on this principle is bridge in
Winnipeg, Manitoba, Canada and is made to carry
pedestrians.
A Cantilever-spar cable-stayed bridge: has a single cantilever spar on one side of the span. Its
spar is made to resist the bending caused by the cables
because cable forces of this bridge are not balanced by
opposing cables and bridge applies large overturning force
on its foundation.
Multiple-span cable-stayed bridge: is a cable-stayed bridge with more than 3 spans. It is a
more complex bridge because the loads from the main
spans are not anchored back near the end abutments.
Extradosed bridge: has stiffer and stronger deck and its cables are
connected to the deck further from the towers which
are also lower than those of standard cable-stayed
bridges.
conclusion
The fabrication and erection of cable-stayed bridges involve major changes in
structure configuration through the addition and removal of structure
components. In every stage of the construction process, adequate information
on the constructed structure is important to determine the real structure
situation for the analysis of errors and to verify construction requirements.
Cable-stayed bridges are widely constructed all over the world. This type of
bridge is very competitive economical for medium and long span. In
comparison with other types of bridge, cable-stayed bridges are particularly
pleasing to the visual senses. Moreover, this type of bridge fills the gap of
efficient span range between conventional girder bridges and the very long
span bridges.

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RVS COLLEGE OF ENGINEERING & TECHNOLOGY

Its a bridge form in which the weight of the deck is supported

The cable-stayed bridge is optimal for spans longer than

Cable-stayed bridges were being designed and constructed by the late

Height of the bridge : 1000mm

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