Analysis Procedure Selection per ASCE 7-16 §12.6

The analysis procedure should be selected in Table 12.6-1.

The four basic procedures provided in Table 12.6-1 are the equivalent lateral force (ELF, Section 12.8), the modal response spectrum (MRS analysis, Section 12.9.1), the linear response history (LRH, Section 12.9.2), and the nonlinear response history (NRH, Section 16.1) analysis procedures.
The use of the ELF procedure is limited to buildings with the listed structural irregularities because the procedure is based on an assumption of a gradually varying distribution of mass and stiffness along the height and negligible torsional response.

Seismic design category	Structural Characteristics	Equivalent Lateral Force Procedure	Modal Response Spectrum Analysis

Seismic design category	Structural Characteristics	Equivalent Lateral Force Procedure	Modal Response Spectrum Analysis
B, C	All structrures	P	P
D, E, F	Risk Category I or II buildings not exceeding two stories above the base	P	P
	Structures of light-frame construction	P	P
	Structures with no structural irregularities and not exceeding 160 ft (48.8 m) in structural height	P	P
	Structures exceeding 160 ft (48.8 m) in structural height with no structural irregularities and with T < 3.5Ts	P	P
	Structures not exceeding 160 ft (48.8 m) in structural height and having only horizontal irregularities of Type 2, 3, 4, or 5 in Table 12.3-1 or vertical irregularities of Type 4, 5a, or 5b in Table 12.3-2	P	P
	All other structures	NP	P

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