Seismic Response Coefficient for Equivalent Lateral Force Method per ASCE 7-16 with ideCAD

How does ideCAD calculate the seismic response coefficient according to ASCE 7-16?

• The seismic response coefficient C_s is determined automatically by Equation 12.8-2, 12.8-3, 12.8-4, 12.8-5 and 12.8-6.

• R, I_e and T_L coefficients in the equations are defined by user.

• R and I_e coefficients are selected by the user in the analysis settings wizard and report results are checked automatically.

SYMBOLS

C_s = The seismic response coefficient
S_D1 = The design spectral response acceleration parameter at a period of 1.0 s,
S_DS = The design spectral response acceleration parameter in the short period range
R = The response modification factor in Table 12.2-1
I_e = The Importance Factor
T = The fundamental period of the structure (s)
T_L = Long-period transition period (s)
S₁ = The mapped maximum considered earthquake spectral response acceleration parameter

12.8.1.1 Calculation of Seismic Response Coefficient

The seismic response coefficient, C_s, is determined by the following equation.

The value of C_s computed with Eq. (12.8-2) need not exceed the following:

for T ≤ T_L

for T > T_L

C_s should not be less than

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Detailed Explanation of Seismic Response Coefficient

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