3D-BASIS-TABS Version 2.0: Computer Program for Nonlinear Dynamic Analysis of Three Dimensional Base Isolated Structures

This report describes the development and verification of the new computer program 3D-BASIS-TABS, an enhanced version of 3D-BASIS, which includes linear beam, column, shear wall and bracing elements to model the elastic three dimensional superstructure and inelastic/nonlinear elementss to model the isolation system. The superstructure member forces are computed in 3D-BASIS-TABS by back substitution, after the nonlinear time history analysis completed, and peak member forces are output to facilitate the design of members The verification of the program 3D-BASIS-TABS is presented in two case studies, i.e., three-story and eight-story buildings with various isolators. These case studies serve also as examples of use if this computer program. A comprehensive user's manual input/output files is presented.(AU)