Flowchart for the design result check of steel member

Start

Determine class of cross section(Class1, Class2, Class3, Class4)

5.3

Check design axial resistance

Check design resistance moment

C

C'

Check lateral torsional buckling resistance ofmember subject to bending

D

A

A'

D'

Check resistance under the combined effects ofaxial load and moment

E E' End

Check design shear resistance

B

B'

Note: The flowchart shown herein illustrates the conceptual process of algorithm. This is not intended for program coding

Flowchart A-A', design axial resistance

A

Determine design tension resistance (Nt.Rd)

5.4.3 (1) a

4.7.3

Check slenderness

Determine design compression resistance (Nc.Rd)

5.4.4 (2)

A'

Is compression member?Yes No

Check design tension resistance criterion(NSd Nt.Rd)

(5.13)

Determine design buckling resistance (Nb.Rd)

(5.45)

Check design compression resistance criterion( NSd min(Nc.Rd , Nb.Rd) )

Determine design plastic shear resistance (Vpl.Rd)

5.4.6

B

Determine reduced design plastic resistancemoment (MV.Rd)

5.4.7 (3)

Flowchart C-C', design resistance moment

C

C'

Flowchart B-B', design shear resistance

B'

shear force exist?

Yes

No

Yes

NoVSd / Vpl.Rd > 0.5

(5.20)

Determine design shear buckling resistance(Vbe.Rd)

(5.58)

d/tw > 69No

Yes

Check design shear resistance criterion( VSd min(Vpl.Rd , Vbe.Rd))

Determine design resistance moment (Mc.Rd )

5.4.5.2

Check design resistance moment criterion

5.4.7 (3)

Flowchart D-D', lateral torsional buckling resistance

5.5.2

D

Determine elastic critical moment (Mcr)

Annex F.1.1

Annex F.2.1

D'

Check design buckling resistance criterion

Yes

uniform symmetrical sectionwith equal flanges?

No

Determine slenderness ratio ( )__

LT

Determine design buckling resistance moment(Mb.Rd)

Flowchart E-E', resistance check under thecombined effects of axial load and moment

E

E'

check capacity under the combined effects oftension and moment

5.4.8.2

Is tension member?Yes No

check capacity under the combined effects oftension and moment

5.4.8.1

Class1 or Class2 ?

Class3 ?

check capacity under the combined effects oftension and moment

5.4.8.3

Yes

Yes

No

No

check resistance under the combined effects ofcompression and moment

5.4.8.2

check resistance under the combined effects ofcompression and moment

5.4.8.1

Class1 or Class2 ?

Class3 ?

check resistance under the combined effects ofcompression and moment

5.4.8.3

Yes

Yes

No

No

E'

check resistance under the combined effects ofcompression and moment

5.5.4