Load combinations for strength design are applied automatically according to reinforced concrete, stuctural steel and seismic regulations.


Symbols

Em = Combined applied design force on the horizontal and vertical seismic load effects
Emh= The effect of horizontal seismic forces including overstrength
Ev = Vertical seismic load effect


2.3 LOAD COMBINATIONS FOR STRENGTH DESIGN (Reinforced Concrete, LRFD)

2.3.6 Basic Combinations with Seismic Load Effects

E = f (Ev; Eh) (defined in Section 12.4.2 or 12.4.3.1) is combined with the effects of other loads, according to ASCE 7-16 Section 2.3.1, basic combinations below is considered.

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 is applied:

The principal loads in the load combinations are identified in Table C2.3-1.

Load combination requirements in Section 2.3 apply only to strength limit states. Serviceability limit states and associated load factors are covered in Appendix C of ASCE 7-16.

2.4 LOAD COMBINATIONS FOR ALLOWABLE STRESS DESIGN - (ASD)

2.4.5 Basic Combinations with Seismic Load Effects

When a structure is subject to seismic load effects, the following load combinations is applied in addition to the basic combinations and associated Exceptions in Section 2.4.1. E =f(Ev; Eh) (defined in Section 12.4.2) is combined with the effects of other loads, the following seismic load combinations is applied.

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.