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24-8009 <br /> Page 8 <br /> <br />RECOMMENDATIONS <br /> <br />Seismic Design Parameters <br />When reviewing the 2022 CBC the following parameters should be incorporated into the design. <br />The Site Class is based on site soil conditions per Section 11.4.3 of the ASCE 7-16. It is our <br />opinion Site Class D - Default is the most appropriate based on site soil conditions. <br /> <br />Parameter Value <br />Latitude (degree) 33.7640 <br />Longitude (degree) -117.8708 <br />Site Class (ASCE 7-16 Section 11.4.3) D–Default <br />Site Coefficient, Fa (CBC Table 1613A.2.3 (1)) 1.2 <br />Site Coefficient, Fv (CBC Table 1613A.2.3 (1)) 1.8 <br />Mapped Spectral Acceleration at 0.2-sec Period, Ss <br />1613A.2.1) <br />1.319 g <br />Mapped Spectral Acceleration at 1.0-sec Period, S1 1613A.2.1) <br />0.47 g <br />Spectral Acceleration at 0.2-sec Period Adjusted for Site Class, SMS (CBC <br />Section 1613A.2.3) <br />1.583 g <br />Spectral Acceleration at 1.0-sec Period Adjusted for Site Class, SM1 (CBC <br />Section 1613A.2.3) <br />0.846 g <br />Design Spectral Acceleration at 0.2-sec Period, SDS <br />1613A.2.4) <br />1.055 g <br />Design Spectral Acceleration at 1.0-sec Period, SD1 1613A.2.4) <br />0.564 g <br />Seismic Response Coefficient (Cs) ASCE 7-16 Per 12.8-6 <br />Mapped MCEG, Peak Ground Acceleration, PGA 0.556 g <br />Site Coefficient for Mapped MCEG, FPGA 1.2 <br />Site Modified Peak Ground Acceleration, PGAM 0.667 g <br /> <br />In general, ASCE 7-16 Section 11.4.8 requires site-specific hazard analysis for structures on <br />Site Class D for values of S1 greater than or equal to 0.2 g. When using Equivalent lateral Force <br />(ELF) and Modal Response Spectrum Analysis (MRSA), the ASCE 7-16 Section 11.4.8 Item 1 <br />exception shall be utilized. Increasing SM1 by 50% in Eq. (11.4-2) results in an increase in the <br />value of SD1 determined by Eq. (11.4-4) by 50%. These increased values of SM1 and SD1 are <br />to be used for all applications of these parameters throughout the Standard, including for <br />formulation of the design response spectrum where a design response spectrum is needed per <br />this standard. It should be noted that the 50% increase in SD1 also increases Ts by 50% <br />resulting in an extension of the acceleration-controlled plateau of the design response spectrum. <br />Cs is determined in accordance with Eq. (12.8-6). <br /> <br />2039 N Victoria Drive <br />#24/28/2025