2e12 04 cold formed structures
TRANSCRIPT
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COLD-FORMEDSTRUCTURES
Czech Technical University in Prague
2E12 Design of steel structures for renewable energy systems 1
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Contents
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Advantages, disadvantages
Production
Effect of cold working on strength
Case studies
Structural details
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Advantages/disadvantages
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Advantages / disadvantages
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Advantages:
low weight
shape variability
surface protection
Disadvantages
unit price
difficult connecting low fire resistance
more careful treatment is required (assembly) s h a p e
v a r i a b i l i t y
( T r e b i l c o
c k )
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Typical cross-sections
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Profiles - bars
Open sections Closed sections
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Profiles – bars - build-up sections
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Open build-up sections
Closed build-up sections
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Profiled sheeting
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Profiled (trapezoidal) sheeting
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Without stiffeners
With longitudinalstiffeners
With transverse andlongitudinal stiffeners
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Production of sections
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Cold rolled coated sheet steel coil (Dubina)
Production from cold-formed sheet
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Production
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From thin-walled sheet
by bending
by pressing
by rolling
Final surface protection in roll
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Roll-forming process (Rhodes)
Rolling
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(Dubina)
Roll-forming of lipped channel
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(Dubina)
Roll-forming of profiled sheeting
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(Vrany)
Roll-forming of profiled sheeting
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(Vrany)
Roll-forming of profiled sheeting
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(Vrany)
Roll-forming of profiled sheeting
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Forming by folding
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Press-braking
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(Dubina)
Press-braking
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Influence of production route
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Strength increase due to cold working
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In Eurocode
In tensional load cases f yb = f y < f ya
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Utilisation
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Utilisation
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floors (support for concrete slabs / permanent
shuttering)
cladding, roofing
purlins, rails
elements of light-weight structures
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Utilisation
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columnliner tray
thermal insulation
thermal insulation strap
sheeting
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Utilisation
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Cold-formed purlins and rails
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Profiles
Span – up to 10 m (12-15 m)
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Cold-formed purlins and rails
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Roofing
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Corrugated sheeting
Sandwich panels
Rigid in its plane
Support of purlin top flange
Uniaxial bending
Lateral and rotational restraint
CDK
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Continuous beams
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Overlap
Sleeve
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Overlap – at support
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M
/ 2
s u p
M
s u p
překrytí
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Sleeve
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Sleeve – bigger sheet thickness
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Structural details
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Structural details
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Support on main frame
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Structural details
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Roof apex connection