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WEST <br />COAST 9540 Semiahmoo Parkway (425) 347-8998 <br />S TRUCTURAL" E' <br />..- : #137 wcse.net <br />ENGINEERING, INC. Blaine, WA 98230 <br />Wind Load Design Procedure: Enclosed Buildings <br />Velocity Pressure Coefficients, Kh and Kz <br />Design Parameters: Table 6-3 qz = 0.00256 * Kz * Kzt * Kd * VA * Iw = <br />V= 110 mph <br />Exposure: B <br />Kd = 0.85 ASCE table 6-4 <br />Kzt = 1 Topographic factor <br />Iw = 1 Importance Factor <br />Building = N (L) Low Rise or (N) Not Low Rise <br />Low Rise: h < 60ft and least horizontal dimension <br />G = 0.85 Gust Factor 6.5.8 <br />Gcpi = 0.18 (+/- figure 6-5) <br />h = 20 mean roof height (ft, h) <br />20 snap to nearest table height <br />qh = 16.3 velocity pressure @ mean roof <br />roof pitch = 5 rise <br />Height, z <br />Exposure <br />qz <br />B <br />C <br />D <br />ft <br />Case 1 <br />Case 2 <br />Cases 1 & 2 <br />Cases 1 & 2 <br />psf <br />0-15 <br />0.70 <br />0.57 <br />0.85 <br />1.03 <br />15.0 <br />20 <br />0.70 <br />0.62 <br />0.90 <br />1.08 <br />16.3 <br />25 <br />0.70 <br />0.66 <br />0.94 <br />1.12 <br />17.4 <br />30 <br />0.70 <br />0.70 <br />0.98 <br />1.16 <br />18.4 <br />40 <br />0.76 <br />0.76 <br />1.04 <br />1.22 <br />20.0 <br />50 <br />0.81 <br />0.81 <br />1.09 <br />1.27 <br />21.3 <br />60 <br />0.85 <br />0.85 <br />1.13 <br />1.31 <br />22.4 <br />70 <br />0.89 <br />0.89 <br />1.17 <br />1.34 <br />23.4 <br />80 <br />0.93 <br />0.93 <br />1.21 <br />1.38 <br />24.5 <br />90 <br />0.96 <br />0.96 <br />1.24 <br />1.40 <br />25.3 <br />100 <br />0.99 <br />0.99 <br />1.26 <br />1.43 <br />26.1 <br />12 run Q = 22.62 <br />1 Main Wind Force Resistina Svstem - Method 2 1 All Heiahts <br />Wall Pressure Coeffici <br />ues <br />0-1 I -0.5 <br />Leeward Wall <br />Walls & Roofs <br />Use With <br />M. <br />1 1 >=4 j -0.2 1 <br />r Side Wall I All Values 1 -0.7 1 ah <br />Roof Pressure Coefficients, C , for use with qh <br />Wind <br />Direction <br />Windward <br />Leeward <br />Angle, q (degrees) <br />Angle, q (deg.) <br />h/L <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />45 <br />>60 <br />10 <br />15 <br />>20 <br />Normal to <br />ridge for q <br />>10 deg <br />< .25 <br />0.70 <br />0.18 <br />-0.50 <br />0.00 <br />-0.30 <br />0.20 <br />-0.20 <br />0.30 <br />-0.20 <br />0.30 <br />0.00 <br />0.40 <br />0.40 <br />0.23 <br />-0.30 <br />-0.50 <br />-0.60 <br />0.5 <br />-0.90 <br />0.18,-0.18, <br />-0.70 <br />-0.40 <br />0.00 <br />-0,30 <br />0.20 <br />-0.20 <br />0.20 <br />-0.20 <br />0.30 <br />-0.00 <br />0.40 <br />0.23 <br />-0.50 <br />-0.50 <br />-0.60 <br />> 1.0 <br />-1.30 <br />'' <br />0.18 <br />-1.00 <br />-0.18 <br />-0.70 <br />-0.18 <br />-0.50 <br />0.00 <br />-0.30 <br />0.201 <br />-0.20 <br />0.20 <br />0.00 <br />0.30 <br />0.23 <br />-0.70 <br />-0.60 <br />-0.60 <br />Normal to <br />ridge for q <br /><10 deg <br />and <br />Parallel to <br />ridge for <br />all q <br /><•5 <br />Horizontal distance <br />from windward edge <br />C p <br />Value provided for <br />interpolation <br />0 to h/2 <br />h/2 to h <br />h to 2h <br />> 2h <br />-0.90 <br />-0.90 <br />-0.50 <br />-0.30 <br />-0.18 <br />-0.18 <br />-0.18 <br />-0.18 <br />Value can be reduced <br />linearly as follows <br />Area (sq ft) Reduction <br />< 100 <br />1 <br />>1 0 <br />0 to h/2 <br />> h/2 <br />-1.30 <br />-0.70 <br />-0.18 <br />-0.18 <br />200 <br />0.9 <br />> 1000 <br />0.8 <br />Project: W4861 Sheet No: 9 9/13/2023 <br />