04 ATTACHMENT 6 - Laserfiche WebLink

Project No. E9164-04-0 2 - 7 - April 15, 2020 TABLE 6.2.1 2019 CBC SEISMIC DESIGN PARAMETERS Parameter Value 2019 CBC Reference Site Class D Section 1613.2.2 MCER Ground Motion Spectral Response Acceleration – Class B (short), SS 1.986g Figure 1613.2.1(1) MCER Ground Motion Spectral Response Acceleration – Class B (1 sec), S1 0.73g Figure 1613.2.1(2) Site Coefficient, FA 1.0 Table 1613.2.3(1) Site Coefficient, FV 1.7* Table 1613.2.3(2) Site Class Modified MCER Spectral Response Acceleration (short), SMS 1.986g Section 1613.2.3 (Eqn 16-36) Site Class Modified MCER Spectral Response Acceleration – (1 sec), SM1 1.241g* Section 1613.2.3 (Eqn 16-37) 5% Damped Design Spectral Response Acceleration (short), SDS 0.1324g Section 1613.2.4 (Eqn 16-38) 5% Damped Design Spectral Response Acceleration (1 sec), SD1 0.827g* Section 1613.2.4 (Eqn 16-39) Note: * Per Section 11.4.8 of ASCE/SEI 7-16, a ground motion hazard analysis shall be performed for projects for Site Class “E” sites with SS greater than or equal to 1.0g and for Site Class “D” and “E” sites with S1 greater than 0.2g. Section 11.4.8 indicates the ground motion hazard analysis may be waived provided certain exceptions are followed. Using the code based values presented in the table above, in lieu of a performing a ground motion hazard analysis, requires the exceptions outlined in ASCE 7-16 Section 11.4.8. 6.2.2 Table 6.2.2 presents additional seismic design parameters for projects with Seismic Design Categories of D through F in accordance with ASCE 7-16 for the mapped maximum considered geometric mean (MCEG). TABLE 6.2.2 2019 CBC SITE ACCELERATION DESIGN PARAMETERS Parameter Value ASCE 7-16 Reference Mapped MCEG Peak Ground Acceleration, PGA 0.825g Figure 22-7 Site Coefficient, FPGA 1.1 Table 11.8-1 Site Class Modified MCEG Peak Ground Acceleration, PGAM 0.908g Section 11.8.3 (Eq. 11.8-1) 6.2.3 Conformance to the criteria presented in Tables 6.2.1 and 6.2.2 for seismic design does not constitute any kind of guarantee or assurance that significant structural damage or ground failure will not occur if a maximum level earthquake occurs. The primary goal of seismic design is to protect life and not to avoid structural damage, since such design may be economically prohibitive.