The Earthquake Engineering Online Archive

ANSR-II: analysis of nonlinear structural response, user's manual

Mondkar, Digambar P.; Powell, Graham H.

UCB/EERC-79/17, Earthquake Engineering Research Center, University of California, Berkeley, 1979-07, 88 pages (555.6/M642/1979)

ANSR is a general purpose computer program for the static and dynamic analysis of nonlinear structures, including both large displacements and inelastic effects. In two previously published reports, the theoretical formulations, features, and organization of version I (ANSR-I) of the program were documented. This report describes an extended version of the program (ANSR-II). Several features have been added to the program. The most important of these are (1) a comprehensive restart option; (2) provision to allow static and dynamic analyses in any sequence; (3) provision for static analysis with prescribed nodal displacements as well as nodal loads; (4) provision for out-of-phase support motions to be specified for earthquake analysis; (5) provision for time delay (traveling wave) effects to be specified for forces and displacements in dynamic analyses; and (6) out-of-core solvers for both symmetrical and unsymmetrical equations. The procedure for adding new elements to the program is described in this report, and a user's manual for the main program is given. The elements in the element library of the program will be described in separate reports.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-79-17.pdf (4 MB)