AD.2006-1002.1.1 Automatic calculation of the Response Spectrum as per IBC
The user enters the latitude and longitude (or select a US zip code), STAAD.Pro then establishes the site coefficients, S1 and SS. The user then selects the appropriate site class (A-F) and with this information, STAAD.Pro calculates the MCE spectral acceleration and design spectral acceleration as per sections 11.4.3 and 11.4.4 of the ASCE7-05 code. Finally the design response spectrum will be generated based on section 11.4.5 of the ASCE7-05 code.
Go to the General | Load page and in the Load dialog box, open the Load Case Details and select the appropriate primary load case with the masses (defined as load items) defined or create a new primary load case and add the masses, if required. Click on the Add button which will bring up the Add New: Load Items dialog box. Select the Response Spectrum option from the list on the left.
With the code option set to Custom, a Generate IBC Spectrum button will now be available as shown thus
Click on the Generate IBC Spectrum button to open the Spectrum Parameters dialog box thus
Refer to Spectrum Parameters dialog for details on the input fields in this dialog.
To complete the generation of the IBC response spectrum pairs, click on the Close button. The completion of the Response Spectrum command continues as for all other Custom defined Response Spectrum commands. Note that the details of the spectrum Period, Acceleration pairs are displayed in the Response Spectrum window, but cannot be modified at this time.
For more details on the Response Spectrum loading command, refer to Section 22.214.171.124 of the Technical Reference Manual .