Response Spectrum UBC 94 Function Definition Form

See Response Spectrum Code Function Definition Form for details about using the form. The parameters for this code are as follows:

The 1994 UBC response spectrum function is based on Figure 16-3 in Chapter 16 of the 1994 UBC. The digitization of these response spectra is based on Section C106.2.1 in the 1996 SEAOC Recommended Lateral Force Requirements and Commentary (more commonly called the SEAOC Blue Book).

The parameters you enter are a seismic zone factor, Z and a soil type. Any positive, nonzero value can be specified for the seismic zone factor; see Table 16-I in the 1994 UBC for typical values. The soil type can be input as 1, 2 or 3; see Table 16-J in the 1994 UBC for typical values.

 

Access the Response Spectrum UBC 94 Function Definition 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 UBC 94 Spectrum in the Choose Function Type to Add drop-down list and click the Add New Function button.

    • Highlight a previously defined UBC 94 Spectrum response spectrum function definition and click the Modify/Show Spectrum button.