See Response Spectrum Code Function Definition Form for details about using the form. The parameters for this code are as follows:
The following parameters are input for the 1996 BOCA response spectrum function. Any positive, nonzero value can be input for these parameters.
Aa = Seismic coefficient representing the effective peak acceleration as determined in 1996 BOCA Section 1610.1.3.
Av = Seismic coefficient representing the effective peak velocity-related acceleration as determined in 1996 BOCA Section 1610.1.3.
R = The response modification factor determined from 1996 BOCA Table 1610.3.3.
S = The coefficient for the soil profile characteristics of the site as determined by 1996 BOCA Table 1610.3.1.
The 1996 BOCA response spectrum function is based on 1996 BOCA Section 1610.5.5. The response spectrum is constructed by plotting the modal seismic design coefficient, Csm, versus the modal period of vibration, Tm. For a given period, Tm, the value of Csm is determined using Equation 11-3.
Access the Response Spectrum BOCA96 Function Definition form as follows:
Click the Loads > Functions Type > Response Spectrum > Expand arrow command, or on the Bridge Wizard click the Response Spectrum Functions item and click the Define/Show Resp Spec Funcs. button, to display the Define Response Spectrum Functions form. Then do one of the following:
Alternatively, click the Loads > Functions Type > Time History > New command and select BOCA 96from the resulting form.
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