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<br />XI.) Shear: <br /> <br />Brown Residence <br /> <br />Load to ceiling/roof diaphragm: <br />Height: 0-15 15-20 20-40 40-60 Total <br />Total hz. Pressure = 315.0 172.5 55.9 0.0 543.4 <br /> <br />pvlf <br /> <br /> <br />0.0 15667.8 lbs <br /> <br />Total shear transferred to sidewall::: 15667.8 lbs <br /> <br />Unit Shear at roof diaphragm: <br /> <br />v=R/b <br />Unit Shear ( v ) =1 <br /> <br />141.91 <br /> <br />77.71 <br /> <br />25.21 <br /> <br />0.01 <br /> <br />244.Slplf <br /> <br />Unit Shear at Midheight walls ( v'): (Design case) <br /> <br />Total width of openings at mid-height wall : <br /> <br />28 <br /> <br />ft <br /> <br />Length of wall available to resist shear = <br /> <br />36 <br /> <br />ft <br /> <br />Unit Shear @ Midheight ( v' ) = <br /> <br /> <br />Select structural element to resist v' from SBC tables ie. 1710.2B <br /> <br />Shear capacity of structural element: 1050 plf <br /> <br />Fv=35psi x 2(1.25si x 12")/ft=1050 plf. <br /> <br />Required length of transverse shearwall =1 14.9 Jft <br /> <br />Longitudinal shear: <br /> <br />Height: 0-15 15-20 20-40 40-60 Total <br />Pressure: 25.2 27.6 33.6 37.2 <br />Contributing Height: 10.0 5.0 1.3 -18.7 <br />Unit Hz. Pressure = 252.0 138.0 44.7 0.0 <br />Reaction (R) = 8064.0 4416.0 1430.0 0.0 13910.0 <br />Unit shear (v=R/I) = 139.8 76.6 24.8 0.0 241.2 <br />Tot. opngs. ~ mid ht 21.0 21.0 21.0 21.0 21.0 <br />Unit Shear ( v') = 219.9 120.4 39.0 0.0 379.3 <br /> -' <br /> <br />lbs <br /> <br />ft <br /> <br /> <br />;; <br /> <br />Required length of longitudinal shearwall =1 13,2 1ft <br /> <br />Page 8 <br />