Response Spectrum NZS4203 1992 Function Definition Form



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Access the Response Spectrum NZS4203 1992 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 NZS4203  Spectrum in the Choose Function Type to Add drop-down list and click the Add New Function button.

    • Highlight a previously defined NZS4203  Spectrum response spectrum function definition and click the Modify/Show Spectrum button.

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

For the 1992 NZS4203 (New Zealand) response spectrum function, input a scaling factor and a site subsoil category. Any positive, nonzero value can be specified for the scaling factor. The site subsoil category can be input as A, B or C.

The 1992 NZS4203 (New Zealand) response spectrum function is constructed as specified in 1992 NZS4203 Section 4.6.

The ordinates of the response spectrum are calculated using 1992 NZS4203 Equations 4.6.3 and 4.6.4. If using Equation 4.6.3, input the scaling factor as Sp * R * Z * Ls. If using Equation 4.6.4,  input the scaling factor as

Sm * Sp * R * Z * Lu.

SAP calculates the Ch(T, 1) term in Equations 4.6.3 and 4.6.4 based on the input site subsoil category and the values for m=1.0 in Figures 4.6.1a, b and c and in Tables 4.6.1a, b and c. In Table 4.6.1a the coefficient values for periods of 0, 0.09 and 0.20 second are taken as 0.40, 0.68 and 0.68, respectively. In Table 4.6.1b the coefficient values for periods of 0, 0.13 and 0.20 seconds are taken as 0.42, 0.80 and 0.80, respectively. In Table 4.6.1c, the coefficient values for periods of 0 and 0.10 second are taken as 0.42 and 0.72, respectively.

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