COLD-FORMED STRUCTURESpeople.fsv.cvut.cz/www/wald/steel/suscos/PP/2E12-04-Cold-formed... ·...
Transcript of COLD-FORMED STRUCTURESpeople.fsv.cvut.cz/www/wald/steel/suscos/PP/2E12-04-Cold-formed... ·...
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COLD-FORMED STRUCTURESCzech Technical University in Prague
2E12 Design of steel structures for renewable energy systems 1
21/11/2010
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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)
shap
e va
riabi
lity
(Tre
bilc
ock)
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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 longitudinal stiffeners
With transverse and longitudinal 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 fyb = fy < fya
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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
supMsu
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