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McPherson Engineering By: F.A. Date: 3/6/23 Seismic Design Parameters Risk Category = 2 Per Table 1-5-1 R = 6.5 Response Modification Factor (Table 12-2.1) Site Class = D Per 11.4.2 Ie = 1 Seismic Importance Factor (Table 1.5-2) Ss = 1.30 Short Period P.G.A. S1 = 0.46 1-Sec Period P.G.A. S.D.C. = D Seismic Design Category Per 11.6 Fa = 1.20 Site Coefficient per Table 11.4-1 ASCE 7-16 Supplement #1 Tables used for Fa and Fv Fv = 1.70 Site Coefficient per Table 11.4-2 (note: section 11.4.8 Exception #2 calc used) SMS = SDS Fa = 1.56 Short Period M.C.E. Per Eq. 11.4-1 SM1 = SD1 Fv = 0.79 1-Sec Period M.C.E. Per Eq. 11.4-2 SDS = 2/3 (SMS) = 1.04 Short Period Design Parameter Per Eq 11.4-3 SD1 = 2/3 (SM1) = 0.52 1-Sec Period Design Parameter Per Eq 11.4-4 Approximate Fundamental Period (Per 12.8.2.1) per Eq. 12.8-7 hn = 15 ft Ct = 0.02 (per table 12.8-2) x = 0.75 (per table 12.8-2) T = 0.15 sec Approximate Fundamental Period TL = 8 sec Long-Period Transition Period per Figure 22-12 Seismic Response Coefficient (Per 12.8.1.1) CS = (SDS Ie)/R = 0.16 Seismic Response Coefficient Per Eq. 12.8-2 Cs1 = 1.5*(SD1 Ie)/R T = 0.79 Max. Seismic Response Coefficient Per Eq. 12.8-3 if T ≤ TL Cs2 = 0.01 Min. Seismic Response Coefficient Per Eq. 12.8-5 Cs2 = 0.044 SDS Ie = 0.05 Min. Seismic Response Coefficient Per Eq. 12.8-5 Cs3 = 0.5 S1 Ie/R = 0.04 Min. Seismic Response Coefficient Per Eq. 12.8-6 if S 1 ≥ 0.6g CS = 0.16 Design Seismic Coefficient Check Additional Base Shear Wexisting = 12.0 kips Weight of Existing Structure Wpanels = 1.0 kips Weight of Proposed Panels Vexisting = Cs Wexisting = 1.9 kips Roof Level Shear of Existing Structure Vpanels = Cs Wpanels = 0.2 kips Additional Roof Level Shear of Proposed Panels Vpanels Vexisting Lateral Loads T = Ct (hn) x = 8.07% < 10%PER C.E.B.C. 502.5 EXCEPTION, STRUCTURE DOES NOT REQUIRE SEISMIC RETROFIT, PANELS OK! 3/6/2023 11:32 AM 5 of 7 ©McPherson Engineering 821 N Lowell St 03/14/23