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1323 E St Gertrude Unit #B - Plan
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1323 E St Gertrude Unit #B - Plan
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6/1/2025 11:56:56 AM
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Plan
Permit Number
20179667
101115120
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1323 E St Gertrude Pl Unit# B
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101115120 - Permit
(Permit - Plan)
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\Building\Permits\S\St Gertrude Pl\1323 E St Gertrude Pl Unit# B
20179667 - Permit
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\Building\Permits\S\St Gertrude Pl\1323 E St Gertrude Pl Unit# B
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McPherson Engineering By:F.A. <br />Date:1/27/23 <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 =1.27 Short Period P.G.A. <br />S1 =0.46 1-Sec Period P.G.A. <br />S.D.C. = D Seismic Design Category Per 11.6 <br />Fa =1.200 Site Coefficient per Table 11.4-1 <br />Fv =1.700 Site Coefficient per Table 11.4-2 <br />SMS = SDS Fa =1.53 Short Period M.C.E. Per Eq. 11.4-1 <br />SM1 = SD1 Fv =0.78 1-Sec Period M.C.E. Per Eq. 11.4-2 <br />SDS = 2/3 (SMS) =1.02 Short Period Design Parameter Per Eq 11.4-3 <br />SD1 = 2/3 (SM1) =0.52 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 = 30 ft <br />Ct =0.02 (per table 12.8-2) <br />x = 0.75 (per table 12.8-2) <br />T =0.26 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 = 0.16 Seismic Response Coefficient Per Eq. 12.8-2 <br />Cs1 = (SD1 Ie)/R T = 0.31 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 =0.04 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 =0.16 Design Seismic Coefficient <br />Check Additional Base Shear <br />Wexisting =173.9 kips Weight of Existing Roof and Half of Wall Weight <br />Wpanels =10.4 kips Weight of Proposed PV System <br />Vexisting = Cs Wexisting =27.2 kips Base Shear of Existing Structure <br />Vpanels = Cs Wpanels =1.6 kips Base Shear of Proposed Panels <br />Vpanels <br />Vexisting <br />Lateral Loads <br />T = Ct (hn)x <br /> = 5.99% < 10%PER C.B.C. 502.5 EXCEPTION, STRUCTURE DOES NOT <br />REQUIRE SEISMIC RETROFIT, PANELS OK! <br />01/30/2023 © McPherson Engineering <br />5 of 6 <br />1323 E St Gertrude Unit B - <br />101115120 & 2017966710/12/2023
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