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Member A-H <br />1.33 x 122F . 456 + -x 4 <br />• 796.5 lb. <br />v .1. 85.12 x4+ 456 <br />8 <br />W . 85.12 (12 + 456 x32 x 16 <br />.- (32 + 41) <br />. 1 70 + 4053 - 4123 8.b.. <br />Section Properties <br />1.35A = 0.61 + -= 1.29 /,0 2 <br />2 <br />0.61 x 1.5 •0.675 *3312 <br />1.29 <br />- 2.44 i• <br />I = 0,787 + 0.61 0.44 - 1.5/ + 0.675 (3.313 - 2.449= 1.84 t. 4 <br />4.223 *2.44f, = - =5.60 bt1.84 <br />i.e SF = 6.24.123 xi. 185 <br />1 .84 , 0.1% = 0.49 U <br />- 1:--=tl·. . -a...n-:gitt.t SF d 6.76 v <br />By comparison ofthe S.F. ibr arrangement 33), Fig. 1,26, and arrangement (C), Fig. 4, it canbe concluded that: <br />I. Using a safety factor S.F. = 2.5 the allowable load, q. is as follows: <br />Design (A) . q. = 167 psf <br />(B) =125 psf <br />(C) =303 psf <br />IL Using a safety factor S.F. = 3, the allowable load q. is as follows: <br />Design (A) qa = 140 psf <br />OB) =100 psf <br />(C) = 250 psf