Worked Example 2: Composite beams 480
Reduction of the cross-section for R90
Strength Reduction Coefficient for the lower flange for R90: k a 0,12 17 / bc h / (38bc ) a0
k a 0,12 17 / 180 400 / (38 180 ) 0,943 0,06 k a 0,079 0,12
a0 0,018ef 0,7 a0 0,018 13,5 0,7 a0 0,943
2 1 120=u1
Strength Reduction Coefficient for the reinforcement for R90:
60 =u s1,2
1 (ua3 a4 )a5 u kr 1 1 Am
V u(1 ) 29 ,43 mm
ui
usi
1 bc ew usi
u( 2 ) 31,72 mm
170=u2