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Required strength of a member U is at least equal to the effects of factored loads in ACI Table 5.3.1. Internal forces and moments resulting from the load combination are expressed as the required strength to be used in design.
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Equations 5.3.1e and 5.3.1g
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Equations [ 1.2D+1.0E+1.0L+0.2S ] and [ 0.9D + 1.0E ] in ACI Table 5.3.1 are load combinations including the seismic load effects and the others are Basic Combinations. As specified in ASCE 7-16 Section 12, when the seismic load effect is combined with the effects of other loads such as D and L , the seismic load combinations shown below are used.
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As specified in ASCE 7-16 Section 12, where the seismic load effect with overstrength is combined with the effects of other loads, the following seismic load combination for structures are used.
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