AN EDUCATIONAL COMPUTER PROGRAM FOR NONLINEAR RESPONSE HISTORY ANALYSIS, VISUALIZATION AND ANIMATION OF RESPONSE OF SEISMICALLY ISOLATED STRUCTURES

A computer program, called DASISedu has been developed to perform advanced nonlinear response history analysis of seismically isolated structures for use in education. The program is an extension of program 3pleANI (MCEER report 13-0010). Key features of the program DASISedu include advanced models for friction pendulum, lead-rubber and elastomeric isolators with and without heating effects, added linear and nonlinear viscous dampers in the isolation system, added viscous or hysteretic dampers in the superstructure, quick generation and visualization of structural models, and interactive visualization and animation of computed response. Building and bridge models may be analyzed. The program includes a large database of ground motions for use in analysis. Also, the program can perform complex eigenvalue analysis to compute damping ratios for damped superstructure buildings based on linearization of behavior for dampers when they are not linear viscous. The program will be available free in the public domain together with a User Guide and Reference Manual and a Verification Manual.