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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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D i f t l t t f bl t

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Roof apex connection