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McPherson Engineering By: T.B. <br />Date: 10/11/23 <br />Seismic Design Parameters <br />Risk Category =2 Per Table 1-5-1 R =6.5 Response Modification Factor (Table 12-2.1) <br />Site Class = D Per 11.4.2 Ie =1 Seismic Importance Factor (Table 1.5-2) <br />Ss =1.60 Short Period P.G.A. <br />S1 =0.57 1-Sec Period P.G.A. <br />S.D.C. =D Seismic Design Category Per 11.6 <br />Fa =1.20 Site Coefficient per Table 11.4-1 ASCE 7-16 Supplement #1 Tables used for Fa and Fv <br />Fv =1.70 Site Coefficient per Table 11.4-2 (note: section 11.4.8 Exception #2 calc used) <br />SMS = SDS Fa =1.92 Short Period M.C.E. Per Eq. 11.4-1 <br />SM1 = SD1 Fv =0.97 1-Sec Period M.C.E. Per Eq. 11.4-2 <br />SDS = 2/3 (SMS) =1.28 Short Period Design Parameter Per Eq 11.4-3 <br />SD1 = 2/3 (SM1) =0.65 1-Sec Period Design Parameter Per Eq 11.4-4 <br />Approximate Fundamental Period (Per 12.8.2.1) <br />per Eq. 12.8-7 <br />hn = 1 ft <br />Ct =0.02 (per table 12.8-2) <br />x = 0.75 (per table 12.8-2) <br />T =0.15 sec Approximate Fundamental Period <br />TL =8 sec Long-Period Transition Period per Figure 22-12 <br />Seismic Response Coefficient (Per 12.8.1.1) <br />CS = (SDS Ie)/R = 0.20 Seismic Response Coefficient Per Eq. 12.8-2 <br />Cs1 = 1.5*(SD1 Ie)/R T = 0.98 Max. Seismic Response Coefficient Per Eq. 12.8-3 if T ≤ TL <br />Cs2 =0.01 Min. Seismic Response Coefficient Per Eq. 12.8-5 <br />Cs2 = 0.044 SDS Ie =0.06 Min. Seismic Response Coefficient Per Eq. 12.8-5 <br />Cs3 = 0.5 S1 Ie/R =0.04 Min. Seismic Response Coefficient Per Eq. 12.8-6 if S 1 ≥ 0.6g <br />CS =0.20 Design Seismic Coefficient <br />Check Additional Base Shear <br />Wexisting =23.0 kips Weight of Existing Structure <br />Wpanels =1.6 kips Weight of Proposed Panels <br />Vexisting = Cs Wexisting =4.5 kips Roof Level Shear of Existing Structure <br />Vpanels = Cs W panels =0.3 kips Additional Roof Level Shear of Proposed Panels <br />Vpanels <br />Vexisting <br />Lateral Loads <br />T = Ct (hn)x <br /> = 6.86% < 10%PER C.E.B.C. 502.5 EXCEPTION, STRUCTURE DOES NOT <br />REQUIRE SEISMIC RETROFIT, PANELS OK! <br />10/11/2023 12:22 PM <br />5 of 7 <br />©McPherson Engineering <br />2142 N Spruce St - <br />201820782/22/2024