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McPherson Engineering By:J.R. Date:7/25/24 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 =1.33 Short Period P.G.A. S1 =0.47 1-Sec Period P.G.A. S.D.C. =D Seismic Design Category Per 11.6 Fa =1.00 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 =1.33 Short Period M.C.E. Per Eq. 11.4-1 SM1 = SD1 Fv =0.80 1-Sec Period M.C.E. Per Eq. 11.4-2 SDS = 2/3 (SMS) =0.89 Short Period Design Parameter Per Eq 11.4-3 SD1 = 2/3 (SM1) =0.53 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 = 0.14 Seismic Response Coefficient Per Eq. 12.8-2 Cs1 = (SD1 Ie)/R T = 0.54 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 =0.04 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 =0.14 Design Seismic Coefficient Check Additional Base Shear Wexisting =57.7 kips Weight of Existing Structure Wpanels =1.0 kips Weight of Proposed Panels Vexisting = Cs Wexisting =7.9 kips Base Shear of Existing Structure Vpanels = Cs Wpanels =0.1 kips Base Shear of Proposed Panels Vpanels Vexisting Lateral Loads - Main Residence T = Ct (hn)x = 1.81% < 10%PER C.E.B.C. 502.5 EXCEPTION, STRUCTURE DOES NOT REQUIRE SEISMIC RETROFIT, PANELS OK! 7/25/2024 5:22 PM 6 of 9 ©McPherson Engineering 2415 N Bonnie Brae9/23/2024