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<br />XI.) Shear: <br /> <br />Christopher Residence <br /> <br />Load to ceiling/roof diaphragm: <br />Height: 0-15 15-20 20-40 40-60 Total <br />Total hz. Pressure = 346.5 103.5 0.0 0.0 450.0 <br /> <br />pvlf <br /> <br /> <br />00 11999.3 lbs <br />Total shear transferred to sidewall = 11999.3 Ibs <br /> <br />Unit Shear at roof diaphragm: <br />v=R/b <br /> <br />Unit Shear ( v ) =1 <br /> <br />161.21 <br /> <br />48.11' <br /> <br />0.01 <br /> <br />0.01 <br /> <br />209.31plf <br /> <br />Unit Shear at Midheight walls ( v'): (Design case) <br /> <br />Total width of openings at mid-height wall: <br /> <br />13 <br /> <br />ft <br /> <br />Length of wall available to resist shear = <br />Unit Shear @ Midheight ( v' ) =1 208.41 62.31 <br /> <br />44.3 ft <br />0.01 <br /> <br />0.01 <br /> <br />270.71plf <br /> <br />Select structural element to resist v' from SBC tables ie. 171O.2B <br /> <br />Shear capacity of structural element: 1050 <br />Fv=35psi x 2(1.25si x 12")/ft=1050 plf <br /> <br />plf <br />(ACI 530, 7.5.2.2) <br /> <br />Required length of transverse shearwall = I 11.4 1ft <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: 11.0 3.0 -2.0 -22.0 <br />Unit Hz. Pressure = 277.2 82.8 0.0 0.0 <br />Reaction (R) = 7945.9 2373.5 0.0 0.0 10319.4 <br />Unit shear (v=R/I) = 149.0 44.5 0.0 0.0 193.5 <br />Tot. opngs. @ mid ht 34.0 34.0 34.0 34.0 34.0 <br />Unit Shear ( v') = 411.1 122.8 0.0 0.0 533.9 <br /> <br />Ibs <br /> <br />ft <br /> <br />Required length of longitudinal shearwall =1 9.8 1ft <br /> <br />({2/ <br /> <br />Page 8 <br /> <br />