Category Dynamics (soil-structure interaction)
Publisher  NISEE - University of California, Berkeley 
Platform DOS, CDC mainframe
Status Public domain
Description Nonlinear Earthquake Analysis of Bridge Systems. NEABS performs nonlinear dynamic analysis of long, multiple span bridge systems by a lumped mass mathematical idealisation using a combination of the following 3D linear and nonlinear element types: (1) Linear elastic and elasto-plastic straight beam elements; (2) Linear elastic circularly curved beam elements; (3) Linear elastic foundation spring elements; (4) Linear and nonlinear expansion joint elements. The program can evaluate dynamic time history response to applied dynamic loadings and/or support excitations (rigid or multiple) prescribed at the base of the bridge columns and abutments. In order to analyse a bridge structure efficiently, modeled with both linear and nonlinear elements, a linear/nonlinear element indication array is defined for monitoring the behavior of these elements throughout the procedure. The program uses a step-by-step direct integration procedure. Either the constant acceleration or the linear acceleration method of integration can be chosen for integration.
Cost Free on WWW
Data formats supported None stated
Supplier in United States of America  NISEE - University of California, Berkeley 

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