Please refer to the Response Spectrum Functions topic for help with the Function Name and Function Damping Ratio edit boxes, Defined Function area, Convert to User Defined button, Function Graph and Plot Options of the form.
The SP 14.13330.2014 response spectrum function is constructed as described in SP 14.13330.2014 p.5. The parameters to be entered are the spectrum direction, the region seismicity at the construction site, the soil category, nonlinear soil deformation factor, and three additional factors.
The region seismicity and soil category values have some restrictions imposed to prevent cases that are not defined in the code. The following combinations of these two inputs are not permitted:
Soil Category = I and Seismicity = 6 or 7
Soil Category = II and Seismicity = 6
Soil Category = III or IV and Seismicity = 9
The method for calculating the response spectrum curve is documented in the Automated Lateral Loads manual.
Access the Response Spectrum Function Definition - SP 14.13330.2014 form as follows:
Click the Define menu > Functions > Response Spectrum command to display the Define Response Spectrum Functions form. Then do one of the following:
Select SP 14.13330.2014 from the Choose Function Type to Add drop-down list; click the Add New Function button.
Highlight an existing SP 14.13330.2014 function definition in the Response Spectra display area and click the Modify/Show Spectrum button.