8/19/2019 2E12 04 Cold Formed Structures

1/37

COLD-FORMEDSTRUCTURES

Czech Technical University in Prague

2E12 Design of steel structures for renewable energy systems   1

21/11/2010

8/19/2019 2E12 04 Cold Formed Structures

2/37

Contents

21/11/20102E12 Design of steel structures for renewable energy systems

2

Advantages, disadvantages

Production

Effect of cold working on strength

Case studies

Structural details

8/19/2019 2E12 04 Cold Formed Structures

3/37

Advantages/disadvantages

21/11/2010

3

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

4/37

Advantages / disadvantages

21/11/20102E12 Design of steel structures for renewable energy systems

4

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   )

8/19/2019 2E12 04 Cold Formed Structures

5/37

Typical cross-sections

21/11/2010

5

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

6/37

Profiles - bars

Open sections   Closed sections

21/11/2010

6

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

7/37

Profiles – bars - build-up sections

21/11/2010C9 Design of steel structures for renewable energy systems

7

Open build-up sections

Closed build-up sections

8/19/2019 2E12 04 Cold Formed Structures

8/37

Profiled sheeting

21/11/2010C9 Design of steel structures for renewable energy systems

8

8/19/2019 2E12 04 Cold Formed Structures

9/37

Profiled (trapezoidal) sheeting

21/11/2010C9 Design of steel structures for renewable energy systems

9

Without stiffeners

With longitudinalstiffeners

With transverse andlongitudinal stiffeners

8/19/2019 2E12 04 Cold Formed Structures

10/37

Production of sections

21/11/2010

10

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

11/37

Cold rolled coated sheet steel coil (Dubina)

Production from cold-formed sheet

21/11/2010

11

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

12/37

Production

21/11/2010C9 Design of steel structures for renewable energy systems

12

From thin-walled sheet

by bending

by pressing

by rolling

Final surface protection in roll

8/19/2019 2E12 04 Cold Formed Structures

13/37

Roll-forming process (Rhodes)

Rolling

21/11/2010

13

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

14/37

(Dubina)

Roll-forming of lipped channel

21/11/2010

14

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

15/37

(Dubina)

Roll-forming of profiled sheeting

21/11/2010

15

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

16/37

(Vrany)

Roll-forming of profiled sheeting

21/11/2010

16

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

17/37

(Vrany)

Roll-forming of profiled sheeting

21/11/2010

17

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

18/37

(Vrany)

Roll-forming of profiled sheeting

21/11/2010

18

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

19/37

Forming by folding

21/11/2010

19

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

20/37

Press-braking

21/11/2010

20

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

21/37

(Dubina)

Press-braking

21/11/2010

21

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

22/37

Influence of production route

21/11/2010

22

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

23/37

Strength increase due to cold working

21/11/2010C9 Design of steel structures for renewable energy systems

23

In Eurocode

In tensional load cases f yb = f y < f ya

8/19/2019 2E12 04 Cold Formed Structures

24/37

Utilisation

21/11/2010

24

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

25/37

Utilisation

21/11/2010C9 Design of steel structures for renewable energy systems

25

floors (support for concrete slabs / permanent

shuttering)

cladding, roofing

purlins, rails

elements of light-weight structures

8/19/2019 2E12 04 Cold Formed Structures

26/37

Utilisation

21/11/2010C9 Design of steel structures for renewable energy systems

26

columnliner tray

thermal insulation

thermal insulation strap

sheeting

8/19/2019 2E12 04 Cold Formed Structures

27/37

Utilisation

21/11/2010C9 Design of steel structures for renewable energy systems

27

8/19/2019 2E12 04 Cold Formed Structures

28/37

Cold-formed purlins and rails

21/11/2010C9 Design of steel structures for renewable energy systems

28

Profiles

Span – up to 10 m (12-15 m)

8/19/2019 2E12 04 Cold Formed Structures

29/37

Cold-formed purlins and rails

21/11/2010

29

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

30/37

21/11/2010

30

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

31/37

Roofing

21/11/2010C9 Design of steel structures for renewable energy systems

31

Corrugated sheeting

Sandwich panels

Rigid in its plane

Support of purlin top flange

Uniaxial bending

Lateral and rotational restraint

CDK 

8/19/2019 2E12 04 Cold Formed Structures

32/37

Continuous beams

21/11/2010C9 Design of steel structures for renewable energy systems

32

Overlap

Sleeve

8/19/2019 2E12 04 Cold Formed Structures

33/37

Overlap – at support

21/11/2010C9 Design of steel structures for renewable energy systems

33

   M 

   /   2

  s  u  p

   M

  s  u  p

překrytí

8/19/2019 2E12 04 Cold Formed Structures

34/37

Sleeve

21/11/2010C9 Design of steel structures for renewable energy systems

34

Sleeve – bigger sheet thickness

8/19/2019 2E12 04 Cold Formed Structures

35/37

Structural details

21/11/2010

35

C9 Design of steel structures for renewable energy systems

8/19/2019 2E12 04 Cold Formed Structures

36/37

Structural details

21/11/2010C9 Design of steel structures for renewable energy systems

36

Support on main frame

8/19/2019 2E12 04 Cold Formed Structures

37/37

Structural details

21/11/20102E12

D i f t l t t f bl t

37

Roof apex connection