W8 x 28 Ix = 98 in4 Iy = 21.7 in4 Lx = 24 ft = 288 in Ly = 16 ft = 192 in Fy = 50 ksi Fu = 65 ksi Unbraced Pinned end condition = Kx = Ky = 1 Tentukan batas tekuk local / tidak? W8x28 H = 8.06 in B = 6.54 in Tw = 0.285 in Tf = 0.465 in λf = b tf = 6.54 0.285 = 22.947 λr = 250 √ fy = 250 √ 50 = 35.355 λw = h tw = 8.06 0.285 =28.28 λr = 665 √ fy = 665 √ 50 = 94.045 λf < λr dan λw < λr (OK) Tentukan terjadi tekuk global / tidak? λc = 1 π x Lk iy √ fy E
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