ELASTO-VISCOPLASTIC FINITE ELEMENT ANALYSIS OF BLAST LOADED REINFORCED CONCRETE STRUCTURES

摘要

This paper, firstly, presents a new rate and history dependent concrete constitutive relationship in which strain-hardening, strain-softening and progressive failure are included. The rate-dependent analysis is based on elasto-viscoplastic theory combined with the smeared crack approach, and the formally proposed three-parameter rate-dependent material model is used. The two-dimensional finite element procedure is then formulated by the explicit predictor-corrector Newmark scheme and fully-explicit Euler approximation of viscoplastic strain is adopted. Finally some numerical examples and comparison with limited experimental results are given. It is demonstrated that the proposed numerical procedure provides an useful tool to analyze dynamic response of reinforced concrete structures under impact and blast loads.