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WEST 9540 Semiahmoo Parkway (425) 347-8998 <br />COAST <br />STRUCTURAL #137 wcse.net <br />ENGINEERING, INC. Blaine, WA 98230 <br />LATERAL ANALYSIS <br />Site Class: D <br />SS : 1.25 ( mapped spectral accel. Short period) Fa : 1.0 ( TABLE 11.4-1) SIDS = (2/3) Fa Ss = 0.83 <br />S1 : 0.40 ( mapped spectral accel. 1-sec. period) F 1.6 ( TABLE 11.4-2) SD1 = (2/3)F Si = 0.43 <br />V = (F*Sds/R)*W = 0.141 W <br />AISC 12.14.8.1 F = 1.1 for two-story buildings <br />R = 6.5 Light -framed walls sheathed with wood structural panels <br />I = 1.0 <br />Calculating Structure Contributing Seismic Weights: <br />Description <br />Area <br />psf <br />W. (k) <br />Roof <br />1779 <br />= 1779 <br />15 <br />26.7 <br />2nd Floor Walls <br />984 <br />= 984 <br />10 <br />9.8 <br />2nd Floor <br />1436 <br />= 1436 <br />10 <br />14.4 <br />1st Floor Walls <br />1476 <br />= 1746 <br />10 <br />17.5 <br />Using allowable stress design load combinations per ASCE 2.4.1 <br />V = 0.7 X 0.141 X 68.3 <br />6.75 kips <br />Total W = 68.3 <br />Project: W4738 Sheet No: 13 10/27/2021 <br />