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For both allowable stress design and strength design methods, where specifically required by Sections 1613 through 1622 or by Chapters 18 through 23, elements and components shall be designed to resist the forces calculated using Equation 16-19 when the effects of the seismic ground motion are additive to gravity forces and those calculated using Equation 16-20 when the effects of the seismic ground motion counteract gravity forces.

1.2D + f1L + Em (Equation 16-19)
0.9D + Em          (Equation 16-20)


where:
Em = The maximum effect of horizontal and vertical forces as set forth in Section 1617.1.
f1 = 1.0 for floors in places of public assembly, for live loads in excess of 100 psf (4.79 kN/m2) and for parking garage live load.
f1 = 0.5 for other live loads.

Related Code Sections

1605.4 Structural Design, Special Seismic Load Combinations
of the seismic ground motion are additive to gravity forces and those calculated using Equation 16-20 when the effects of the seismic ground motion ...
1617.1 Structural Design, Seismic Load Effect E and EM
The maximum seismic load effect,Em, for use in the special seismic load combination of Section 1605.4 shall be the special seismic load determined from ...