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NSPECTRA is a computer program that does in one run the analysis for obtaining the response spectra of a collection of ground motions and calculates the mean and standard deviation of the response spectra of that collection of ground motions.
The program allows the user to select up to four response spectra from the next available options: relative displacement, relative velocity, relative acceleration, absolute acceleration, and restoring force. Aditional to these response spectra, the computer program provides as an output the energy spectra file that containes the input, damping, and hysteretic energy spectra.
The program is very easy to use. The information on names and directories where the ground motions are located is provided in the input file NSPINP. An interactive menu handles information on data such as initial and final period in the spectrum, damping ratio, and data for the smooth model.
The theory and computer implementation of this program will be published in a MCEER report. Details of the program's features and its analytical basis can be found on the feature page.
