Basic Combinations with Seismic Load Effects
3According to ASCE 7-16, 2.4.5 Basic Combinations with Seismic Load Effects.
When a structure is subject to seismic load effects,
the following load combinations shall be considered
in addition to the basic combinations and associated
Exceptions in Section 2.4.1.
Where the prescribed seismic load effect, E = f(Ev, Eh)
(defined in Section 12.4.2) is combined with the effects
of other loads, the following seismic load combinations
shall be used:
8. 1.0D + 0.7Ev + 0.7Eh
9. 1.0D + 0.525Ev + 0.525Eh + 0.75L + 0.75S
10. 0.6D – 0.7Ev + 0.7Eh
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Where the seismic load effect with overstrength,
Em = f(Ev, Emh), defined in Section 12.4.3, is combined
with the effects of other loads, the following seismic
load combination for structures not subject to flood or
atmospheric ice loads shall be used:
8. 1.0D + 0.7Ev + 0.7Emh
9. 1.0D + 0.525Ev + 0.525Emh + 0.75L + 0.75S
10. 0.6D – 0.7Ev + 0.7Emh
Where allowable stress design methodologies are used with
the seismic load effect defined in Section 12.4.3 and applied
in load combinations 8, 9, or 10, allowable stresses are
permitted to be determined using an allowable stress increase
factor of 1.2. This increase shall not be combined with increases
in allowable stresses or load combination reductions otherwise
permitted by this standard or the material reference document
except for increases caused by adjustment factors in accordance
with AWC NDS.
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