mySpec

This program calculates the response of a SDF or a 2DOF system which is subjected to an excitation. The analysis may be linear elastic or non-linear. The response is calculated for several models, including linear elastic, bilinear inelastic, Bouc Wen. The typical excitation corresponds to a ground motion specified by an earthquake. However, an arbitrary excitation force can be used as well, either alone or together with an earthquake.All diagrams of interest can be plotted on the screen or sent to the printer. Also, the results can be exported in the form of ASCII text files. Moreover, such files can be easily inserted to a spreadsheet application.Apart from the diagrams, the program is capable of producing a simulation of the behaviour of the system in animated form and idealized as a lumped mass on the top of a column of specified stiffness.

You can download mySpec here. For more information, please refer to  MySpec's Manual.