How does ideCAD scale design values of combined response according to ASCE 7-16?
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Symbols
V = The equivalent lateral force procedure base shear
Vt = The base shear from the required modal combination
Cs = The seismic response coefficient
W = The effective seismic weight
R = The response modification factor in Table 12.2-1
Ie = The Importance Factor
SD1 = the design spectral response acceleration parameter at a period of 1.0 s
T = The fundamental period of the structure(s)
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A base shear (V) is calculated in each of the two orthogonal horizontal directions using the calculated fundamental period of the structure T in each direction and the procedures of Section 12.8.
The seismic base shear, V, in the earthquake direction considered, is determined by the following equation.
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Scaling of Forces per ASCE 12.9.1.4.1
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Where If the calculated fundamental period exceeds CuTa in a given direction, CuTa is used in lieu of T in that direction. Where the combined response for the modal base shear (Vt) is less than 100% of the calculated base shear (V) using the equivalent lateral force procedure, the forces is multiplied by V∕Vt.
Scaling of Drifts per ASCE 12.9.1.4.2
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Where If the combined response for the modal base shear (Vt) is less than CsW, and where Cs is determined with Eq. (12.8-6), drifts are multiplied by CsW∕Vt.
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