Assessment of Existing Structures and Repairs - Offshore Structures: Design, Construction and Maintenance - page 484

Design Loading: N d = 991.8 kN

991.8kN

3.5 m HEB 180

51.2 kg/m, i min = 4.57 mm, A = 6530 mm 2 ) Try HEB 180 : (180 × 180 ×

= (235/f y ) 0.5 = 0.92

Section Classification : ε

d/t w = 122/8.5 = 14.4 < 33 × 0.92

c/t f = 90/14 = 6.4 < 10 × 0.92 … Class 1

Compression Resistance :
Slenderness λ = 3.5/0.046 = 76.6

λ 1 = 86.8
Normalized slenderness = λ / λ 1 = 0.88

Reduction factor = 0.61

β A = 1 for Class 1 sections
Buckling resistance N b.Rd =

χ

χβ A Af y / γ M.1

= 0.61 × 1 × 6530 × 0.275/1.1

991.8
Steel column: design resistance at 20 ° C

= 997 kN >

456 kN

Design loading in fire : N fi.d = η fi N d

Combination factor ψ 1.1 = 0.5

G k.1 /Q k = 2.0