component method for high strength steel rectangular hollow … · 2019-11-25 · structural...

Component Method for High Strength Steel Rectangular Hollow Section T Joints

Marsel Garifullin, D.Sc. (Tech.)

Faculty of Built Environment, Tampere University

SCOPE OF RESEARCH 2 / 18

SCOPE OF RESEARCH

brace

chord

weld around

3 / 18

STRUCTURAL ANALYSIS

N0

N0

N Mip Mop

4 / 18

STRUCTURAL ANALYSIS

Load

Deformation

5 / 18

STRUCTURAL ANALYSIS

Load

Deformation

Resistance

5 / 18

STRUCTURAL ANALYSIS

Load

Deformation

Stiffness

5 / 18

STRUCTURAL ANALYSIS

• Eurocode EN 1993-1-8:2005

• AISC Steel Design Guide 24

• AS/NZS 4673

• CIDECT Design Guide No. 3

= + + −−

2

,1, 0 0 1 5

1 2/

2 11ip Rd n y M

ηM k f t h γ

η ββ

6 / 18

Chord face failure Chord side wall failure Chord shear failure

Punching shear Brace failure Local buckling

FAILURE MODE APPROACH 7 / 18


M 1 = 26.3 kNm M2 = 19.6 kNm M3 = 45.8 kNm



M 1 = 26.3 kNm M2 = 19.6 kNm

Joint resistance

M3 = 45.8 kNm


FAILURE MODE APPROACH

bird-beak joint end-plate joint cleat joint column base

8 / 18

COMPONENT METHOD

zero

distance

zop

zip

9 / 18

,

4

4

Rd Rd

j ini eq

N F

C Ek

=

=

FRd, keq

a) chord face in bending

b) chord side walls in tension / compression

c) chord side walls in shear,

d) chord face under punching shear

e) brace flange / webs in tension / compression

f) chord section in distortion

g) welds

COMPONENT METHOD

chord axis

Mop,Rd, Sj,ini,op

rigid beam

Mip,Rd, Sj,ini,ip

NRd, Cj,ini,N

brace axis

10 / 18

INFLUENCE OF FILLET WELDS 11 / 18


0

10

20

30

40

50

0,0 0,1 0,2 0,3

M[k

Nm

]

φ [rad]

a10

a6

1/2v


0

10

20

30

40

50

0,0 0,1 0,2 0,3

M[k

Nm

]

φ [rad]

a10

a6

1/2v

Eurocode


.

.

→ = +

→ = +

eq w

eq w

b b b a

h h h a

1 1

1 1

1 13

1 13

Ultra high strength steels

(UHHS)

High strength

steels (HSS)Regular steels

HIGH STRENGTH STEEL 13 / 18

Design rules

S355 S460 S550 S700 S900 S1100

S355 S460 S550 S700 S900 S1100


(UHHS)

High strength



Design rulesReduction

factor 0.9

S355 S460 S550 S700 S900 S1100

S355 S460 S550 S700 S900 S1100


(UHHS)

High strength




factor 0.9

Reduction

factor 0.8

S355 S460 S550 S700 S900 S1100

S355 S460 S550 S700 S900 S1100


(UHHS)

High strength




factor 0.9No design rules

Reduction

factor 0.8

S355 S460 S550 S700 S900 S1100

S355 S460 S550 S700 S900 S1100


Jointb0

[mm]

h0

[mm]

t0

[mm]

b1

[mm]

h1

[mm]

t1

[mm]β

Chord

Steel

Brace

Steel

aw

[mm]aw /aw,fs

S420_S420_a6

150 150 8

100 100 8 0.67 S420 S420

6

0.51

S500_S420_a6 100 100 8 0.67 S500 S420 0.51

S500_S500_a6 100 100 8 0.67 S500 S500 0.47

S700_S420_a6 100 100 8 0.67 S700 S420 0.51

S700_S500_a6 100 100 8 0.67 S700 S500 0.47

S700_S500_a6_WiPF 100 100 8 0.67 S700 S500 0.47

S700_S700_a6 120 120 8 0.80 S700 S700 0.45

S420_S420_a10

150 150 8

100 100 8 0.67 S420 S420

10

0.84

S500_S420_a10 100 100 8 0.67 S500 S420 0.84

S500_S500_a10 100 100 8 0.67 S500 S500 0.78

S700_S420_a10 100 100 8 0.67 S700 S420 0.84

S700_S500_a10 100 100 8 0.67 S700 S500 0.78

S700_S500_a10_WiPF 100 100 8 0.67 S700 S500 0.78

S700_S700_a10 120 120 8 0.80 S700 S700 0.76

S420_S420_1/2v

150 150 8

100 100 8 0.67 S420 S420

butt -

S500_S420_1/2v 100 100 8 0.67 S500 S420

S500_S500_1/2v 100 100 8 0.67 S500 S500

S700_S420_1/2v 100 100 8 0.67 S700 S420

S700_S500_1/2v 100 100 8 0.67 S700 S500

S700_S700_1/2v 120 120 8 0.80 S700 S700


4

6

8

10

12

14

0,3 0,4 0,5 0,6 0,7 0,8 0,9

Mn

orm

β

Eurocode

S420 S500 S700

Eurocode 0.9 0.8 0.8

Proposal, butt welds 0.9 0.8 0.8

Proposal, fillet welds 1.0 1.0 0.9

SURROGATE MODELLING 16 / 18


-1,5

-1,0

-0,5

0,0

0,5

1,0

1,5

2,0

-0,5 1,5 3,5 5,5 7,5 9,5

y=

f(x

)

x


-1,5

-1,0

-0,5

0,0

0,5

1,0

1,5

2,0

-0,5 1,5 3,5 5,5 7,5 9,5

y=

f(x

)

x

Variables

b0 2γ = b0/t0 β = b1/b0 φ


3

5

7

9

11

13

100 140 180 220 260 300

t 0[m

m]

b0 [mm]

Sampling


3

5

7

9

11

13

100 140 180 220 260 300

t 0[m

m]

b0 [mm]

Sampling FE simulations


3

5

7

9

11

13

100 140 180 220 260 300

t 0[m

m]

b0 [mm]

S[k

Nm

/rad

]

Sampling FE simulations Surrogate model

FUTURE RESEARCH 18 / 18

Mop

out-of-plane bending

FUTURE RESEARCH 18 / 18

Mop

out-of-plane bending K joint KT joint

component method for high strength steel rectangular hollow … · 2019-11-25 · structural...

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