Question

Q1. A single angle section ISA 60*60*8mm, 3.Om long, is used as strut. The ends are welded to the gusset plates. Determine the design compressive strength and the service load that can be applied.

solve this please

Answer 1

For ISA 60x60x8 mm Imin = 11.5 mm , A = 896 mm² Length of an angle = 3 m = 3000 mm Let us take effective length = 0.9L= 2700 mm Equivalent slenderness ratio is given by de = Vk + k, 2 ? + k₃1? where 2700/11.5 tw = TET 2 (2x10) = = 2.64 V 250 V 250 1r 1. 60+60 b + b₂ 12E -= 0.0844 22(2x10°) x2x8 * 2t 1/x^(2x10%) 50V 250 From table 8.8, kı = 0.2 , k2 = 0.35 and kz = 20 2. = V0.2 +0.35(2.54)2 + 2000.0844)2 = 1.613 Design compressive stress is given by Jed"$+($– 13)" Pod =_ Fyl Ymo where $=0.5[1+a(2-0.2)+2?]=0.5[1+0.49(1.613 – 0.2)+1.613²] =2.15 250/1.1 Jed 2.15+(2.152 -1.6132)." 2,05 = 63.63 N/mm2 Design compressive strength = Pa = fcdA = 63.66x896 = 57017 N = 57 kN Service load = P=P/1.5 = 57/1.5 = 38 KN