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<br /> <br /> <br /> <br /> <br /> <br />3rd & Broadway, Santa Ana, CA <br />Volume 1 - Basis of Design June 17, 2024 | Project # S21043.00 <br /> pg. 16 <br />2.3.3 SEISMIC LOAD COMBINATIONS <br />The seismic load combinations follow the design load combination listed in ASCE 7 -16 Chapter 12. <br />The design level earthquake event is analyzed using a modal response spectrum analysis with <br />accidental torsion. The analysis includes enough modes to achieve a modal mass participation <br />factor of at least 90 percent in each orthogonal direction. <br /> <br />Table 2.3-4 - Earthquake Load Combinations <br /> <br />Notation Load Combination Reference <br />LC6 (1.2 + 0.2Sds)D + ρ(1.0Ex + 0.3Ey) + 0.5L ASCE 7-16 2.3.6 <br />LC6b (1.2 + 0.2Sds)D + ρ(1.0Ex - 0.3Ey) + 0.5L ASCE 7-16 2.3.6 <br />LC7 (0.9 – 0.2Sds)D + ρ(1.0Ex + 0.3Ey) + 1.6H ASCE 7-16 2.3.6 <br />LC7b (0.9 – 0.2Sds)D + ρ(1.0Ex - 0.3Ey) + 1.6H ASCE 7-16 2.3.6 <br /> <br /> <br />Load combinations are presented here with only +1Ex and +0.3Ey factors for clarity. Actual load <br />combinations include reversal of directions and swapped factors, or 8 actual cases for each LC. <br /> <br />D = Dead load <br />L = Unreduced live load <br />Ex = X-direction earthquake loading <br />Ey = Y-direction earthquake loading <br />H= Lateral earth pressure <br />Sds= 1.177 (see geotechnical report) <br />ρ = 1.0 (Redundancy factor) <br /> <br />