NEABS

Category  Dynamics (soilstructure 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 elastoplastic 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 stepbystep 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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