Response Spectrum Wizard : User Defined Spectrum

The user-defined spectrum must be defined externally and can be imported in this dialog.

Import

The user is given a file selection dialog to select the file to import. The files supported are:

• Text - tab delimited (.txt)
• Text - comma delimited (.csv)
• T/HIS curve file (.cur)
• GFA binary file (.gfa)

The files must contain values of displacement / velocity / acceleration as a function of period / frequency.

The types for the abscissa (x-axis) should be one of:

• FREQUENCY
• PERIOD

The types for the ordinate (y-axis) should be one of:

• DISP
• VELOCITY
• ACCELERATION

Export

The user is given the option of exporting a file. This allows a file to be modified if required and then re-imported into GSA. The files supported are:

• Text - tab delimited (.txt)
• Text - comma delimited (.csv)
• T/HIS curve file (.cur)
• HTML files file (.htm,.html)

Modify

In many cases the imported file contains the correct data but the data needs some modification, such as scaling so that the units are correct. See Modify Curve.