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An alternative way to define a design spectrum is the site-specific spectrum in which the user can enter data directly in the table (T vs Sa), or by pasting the data (Ctrl + V) which is copied from another software such as Excel. The user-defined spectrum allows the design spectral values and dispersion (LogSigma) to be defined for each period independently.
The data table and spectrum curve will update automatically when all input parameters are defined. Users may also select to plot to the Standard Deviation and Target Mean +/- Standard Deviation in a Linear or Logarithmic scale on the same plot.
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Figure: User-Defined Spectrum Dialog
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Figure: Copy and paste data from excel
The example below shows a user-defined Conditional Spectrum (CS) which features a varying LogSigma. As typical with CS, LogSigma is zero at the 1-second conditioning period and increases away from that period.
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Figure: Conditional Spectrum can be defined by varying the LogSigma variable with period T
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