Steel Buildings in Europe

Part 5: Detailed Design of Trusses 5 - 42 4.2.1 Lower chord in tension (flat IPE 330) The lower chord in tension is verified for calculated forces near the mid-span. Given the results shown in 3.2 above: N Ed = 1582 kN M Ed = 1,69 kNm The tension resistance of the section is determined by two conditions, one in a “gross” section and the other in a “net” section : Gross section A = 6260 mm 2 2222 kN 1,0 6260 0,355 M0 y pl,Rd    x Af N  Net section 2 net 4661mm (4 24 11,5) (3 22 7,5) 6260         A 1711 kN 1,25 0,9 4661 0,51 0,9 M0 net u u,Rd       A f N Tension resistance is given by: ) 1711kN , min( u,Rd pl,Rd t,Rd   N N N In simple bending, in the truss plane (EN 1993-1-1 (6.2.5)), class 1 of the section allows the plastic modulus to be mobilised: 3 2 pl 147,2 cm 4 2 1,15 16     W 52,3 kNm 1,0 147,2 0,355 M0 pl y pl,Rd      W f M The verification is: 0,03 52,3 1,69 0,93 1711 1582 Rd Ed t,Rd Ed     M M N N N-M Interaction: 0,93 + 0,03 = 0,96 < 1 4.2.2 Diagonal in tension (double angles L120  120  12) Checking is done for the diagonal at the left hand support, under gravity loads. Given the results shown in 3.2 above: N Ed = 616,3 kN