1323 E St Gertrude Unit #B - Plan

Home Browse Search

McPherson Engineering By:F.A. Date:1/27/23 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 =1.27 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 =1.200 Site Coefficient per Table 11.4-1 Fv =1.700 Site Coefficient per Table 11.4-2 SMS = SDS Fa =1.53 Short Period M.C.E. Per Eq. 11.4-1 SM1 = SD1 Fv =0.78 1-Sec Period M.C.E. Per Eq. 11.4-2 SDS = 2/3 (SMS) =1.02 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 = 30 ft Ct =0.02 (per table 12.8-2) x = 0.75 (per table 12.8-2) T =0.26 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 = (SD1 Ie)/R T = 0.31 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 =0.16 Design Seismic Coefficient Check Additional Base Shear Wexisting =173.9 kips Weight of Existing Roof and Half of Wall Weight Wpanels =10.4 kips Weight of Proposed PV System Vexisting = Cs Wexisting =27.2 kips Base Shear of Existing Structure Vpanels = Cs Wpanels =1.6 kips Base Shear of Proposed Panels Vpanels Vexisting Lateral Loads T = Ct (hn)x = 5.99% < 10%PER C.B.C. 502.5 EXCEPTION, STRUCTURE DOES NOT REQUIRE SEISMIC RETROFIT, PANELS OK! 01/30/2023 © McPherson Engineering 5 of 6 1323 E St Gertrude Unit B - 101115120 & 2017966710/12/2023