Implementation of a Postcracking Model for Finite Element Analysis of Reinforced Concrete

摘要

A computer code has been developed to model the nonlinear response of reinforced concrete elements subjected to plane strain, plane stress or axisymmetric loading conditions. The material subroutine includes the following sources of nonlinear behavior: (a) Nonlinear stress strain curve for concrete as represented by the endochronic model; (b) stress-strain curve for the reinforcement including the elastic, plastic and strain hardening stages; (c) concrete anisotropy caused by complex stress states and cracking; and (d) the postcracking shear transfer mechanisms. The computer code has been checked with a very limited amount of experimental data for plain concrete and for an initially cracked reinforced concrete panel subjected to biaxial stress states. In general, the code predicts results that agree satisfactorily with the experimental data but needs to be further checked against additional test cases.