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<br />F,) Moment Capacity of Reinforced Masonry Bond Beam: <br /> <br />Allowable stress Fb: <br />falFa + tb/Fb < or = 1 <br /> <br />(ACI 530, 6.3.1) <br /> <br />Fb = Fa = 1.333 x fm 13 = 799.8 pSI <br /> <br />(ACI 530, 7.3.1.2 <br /> <br />Therefore, tb < or = Fb - fa <br /> <br />tb (max) = Fb - T (diaphragm tension)1 hb = 793.0 pSI <br /> <br />Fs" = 1.33 x Fs = 26,660 pSI (ACI 530, 5.3.2) <br /> <br />Rho = As I bd = 0.0065 <br /> <br />Rho x N = 0.0780 <br /> <br />k = 0.3247 <br /> <br />j=l-k/3= 0.8918 <br /> <br />Masonry Capacity: <br /> <br />Mm = 1/2 (tb xj x k x b x d^2) = 33,063 in-Ibs <br /> <br />Reinforcing Capacity: <br /> <br />Ms = As x fs xj x d = 44,221 in-Ibs <br /> <br />Therefore, masonry stress governs. <br /> <br />Therefore, L = (12 x Mm I uplift - bond bm. dead load)^1/2 = I 16.2 1ft <br /> <br />Page 12 <br /> <br /> <br />{ /..t:( <br /> <br />s Catalano, P. E. <br />8/l/95 <br />