COLD-FORMED STRUCTURESCzech Technical University in Prague
2E12 Design of steel structures for renewable energy systems 1
21/11/2010
Contents
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Advantages, disadvantages Production Effect of cold working on strength Case studies Structural details
Advantages/disadvantages
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C9 Design of steel structures for renewable energy systems
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)
Typical cross-sections
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C9 Design of steel structures for renewable energy systems
Profiles - bars
Open sections Closed sections
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C9 Design of steel structures for renewable energy systems
Profiles – bars - build-up sections
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Open build-up sections
Closed build-up sections
Profiled sheeting
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Profiled (trapezoidal) sheeting
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Without stiffeners
With longitudinal stiffeners
With transverse and longitudinal stiffeners
Production of sections
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C9 Design of steel structures for renewable energy systems
Cold rolled coated sheet steel coil (Dubina)
Production from cold-formed sheet
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C9 Design of steel structures for renewable energy systems
Production
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From thin-walled sheet by bending by pressing by rolling
Final surface protection in roll
Roll-forming process (Rhodes)
Rolling
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C9 Design of steel structures for renewable energy systems
(Dubina)
Roll-forming of lipped channel
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C9 Design of steel structures for renewable energy systems
(Dubina)
Roll-forming of profiled sheeting
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C9 Design of steel structures for renewable energy systems
(Vrany)
Roll-forming of profiled sheeting
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C9 Design of steel structures for renewable energy systems
(Vrany)
Roll-forming of profiled sheeting
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C9 Design of steel structures for renewable energy systems
(Vrany)
Roll-forming of profiled sheeting
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C9 Design of steel structures for renewable energy systems
Forming by folding
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C9 Design of steel structures for renewable energy systems
Press-braking
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C9 Design of steel structures for renewable energy systems
(Dubina)
Press-braking
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C9 Design of steel structures for renewable energy systems
Influence of production route
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C9 Design of steel structures for renewable energy systems
Strength increase due to cold working
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In Eurocode In tensional load cases fyb = fy < fya
Utilisation
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C9 Design of steel structures for renewable energy systems
Utilisation
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floors (support for concrete slabs / permanent shuttering)
cladding, roofing purlins, rails elements of light-weight structures
Utilisation
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columnliner tray
thermal insulation
thermal insulation strap
sheeting
Utilisation
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Cold-formed purlins and rails
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Profiles
Span – up to 10 m (12-15 m)
Cold-formed purlins and rails
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C9 Design of steel structures for renewable energy systems
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
Continuous beams
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Overlap
Sleeve
Overlap – at support
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M
/2
supMsu
p
překrytí
Sleeve
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Sleeve – bigger sheet thickness
Structural details
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C9 Design of steel structures for renewable energy systems
Structural details
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Support on main frame
Structural details
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Roof apex connection
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