Steel Structures Design Based On Eurocode 3
Steel Structures Design Based On Eurocode 3
Steel Structures Design Based On Eurocode 3
Part I
Florea Dinu
Lecture 5: 22/02/2017
European Erasmus Mundus Master Course
Sustainable Constructions
under Natural Hazards and Catastrophic Events
520121-1-2011-1-CZ-ERA MUNDUS-EMMC
European Erasmus Mundus Master Course
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
Categories of halls:
• Standard low cost (budget price)
fast available - provided from stock
Θ lack of flexibility (difficult to adapt)
Θ light cranes only (if any…)
• Purpose-made ... suitable for given production, use
(e.g. heavy cranes, lighting and ventilation,...)
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Warehouse
Production Comercial
Sport
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures www.lindab.com 4
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Standard types
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
Standard types
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Purpose-made
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Crane
overlap
frame
spacing ℓ
bay span L
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Sustainable Constructions under Natural Terminology of cross section with roof truss
Hazards and Catastrophic Events
alt. 1 alt. 2
Hot rolled purlins and rails Thin-walled purlins and cassettes
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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by courtesy of
Dowling – Knowles –Owens:
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
Structural Steel Design 1988 10
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Sustainable Constructions under Natural Cross-section of halls (i.e. common frames and gables)
Hazards and Catastrophic Events
2. Frames
small basements,
aesthetical structure,
• sensitive to settling of supports and
temperature effects
• at crane halls: crane vibrations up to roof
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
3. Gables
common frame with additional framing
Solution
• hall may easily be extended
gable wall
• the frame is heavy, expensive
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
Dilatation segments:
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Composition
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Bearing layer
1) Trapezoidal sheeting economic spans L = 1 ÷ 3 m (up to 6 m)
•
usually galvanized 275 g/m2.
•
superior with additional coating of polyester 15-25 μm,
•
perfect protection PVDF 25 μm,
•
or also protection against mechanical damage: PVC 200 μm.
fixing to purlins: - self-tapping screws
- cartridge fired pins
Typical arrangements:
• without insulation
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
16
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• insulated
- cladding from thin-walled sheeting (steel, aluminium, stainless steel)
breaking of thermal bridge
(self-adhesive tape 30x8 mm)
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
2) Silicate slabs
• reinforced/prestressed concrete slabs (L ≈ 3 m) or panels (L ≈ 6 m),
• reinforced light concrete slabs (cellular concrete, liapor - keramzite, etc).
3) Translucent panels
• polycarbonate plates planar, corrugated, lenses, skylights,
• glass in grid structure.
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Hot-rolled purlin
Generally loaded in bi-axial bending and torsion (giving σ, τ)
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
a) Non-rigid roofs
• assembly stages of rigid roofs, great slopes of roofs,
• trapezoidal sheeting not sufficiently connected in sidelaps and to purlins,
• non-rigid bearing layer (translucent soft panels, fragile eternit, etc.).
b) Rigid roofs
•
silicate roofs after imbedding,
•
trapezoidal sheeting: - with sidelap connection at ≤ 500 mm,
- connected to purlins at ≤ 300 mm.
Due to deflection arises only bending about y (My).
E.g. similarly as above:
Class 2 cross-section: My,Ed ≤ Mc,Rd =Wplfy / γ M0
Loading in slope direction (qz) of rigid roofs is transferred by roof plate to:
a. eaves purlin,
b. eaves bracing,
c. connection at apex (namely in thin-walled purlins),
d. connection of roof plate to rafters (particularly in roofs without purlins).
a) Eaves purlin (loaded from smaller loading width in comparison to intermediate purlin)
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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thin walled
latch lock
Note: in non-rigid roofs, the eaves purlin is loaded as intermediate purlins, but with smaller
loading width.
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Apex purlin:
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures 25
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Example
www.dimond.co.nz
L = Span length
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Example
www.Lindab.com
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– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Continuous purlins are usually staggered to ensure the same loading of main
frames. The reactions are: 0,375 qL + 1,25 qL + 0,375 qL
Advantages:
• redistributed moments are 31% lower,
• deflections are approx. 40 % lower.
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
Detail of hinge:
(in acc. to roof slope)
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Plan
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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European Erasmus Mundus Master Course
Roof trusses
Types:
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L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
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Structural details
• shop connections are mostly welded
• site connections bolted (may be also welded).
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
34
European Erasmus Mundus Master Course
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
35
European Erasmus Mundus Master Course
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
36
European Erasmus Mundus Master Course
The SUSCOS powerpoints are covered by copyright and are for the
exclusive use by the SUSCOS teachers in the framework of this Erasmus
Mundus Master. They may be improved by the various teachers
throughout the different editions.
L5 - 2C08
L10 Single properties
– B.2 – Mechanical storey Industrial buildings
of cast iron, mild iron and steel at historical structures
37
florea.dinu@upt.ro
http://ct.upt.ro/suscos