COLD-FORMED STRUCTURES

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COLD-FORMED STRUCTURES Czech Technical University in Prague 2E12 Design of steel structures for renewable energy systems 1 21/11/2010

Transcript of COLD-FORMED STRUCTURES

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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