| The nonlinear finite element analysis of cracked reinforced concrete has being developed for about 40 years and great success has been achieved. But up to now, three major problems still exist: how to simulate the post-peak response of concrete, how to formulate a rational model of the effect of confinement due to triaxial stress states, and how to utilize these models to get the response of the components and structures with a numerically sound algorithm. These problems have drawn the attention of researchers worldwide. In modeling materials under general loads, effects of unloading and reloading paths of both concrete and reinforcement under reversed cyclic loading and evolution of strains are of crucial importance.On the basis of the work previously done in our group, the author developed the 2-D nonlinear finite element FEAP program on FEAPpv based on the rotating and smeared crack models proposed in the MCFT(Modified Compression Field Theory), the following work has been carried out in this paper:1. The post-peak response of a structure was obtained by displacement-controlled loading method.2. Mander model was implemented in FEAP program to account for confinement on concrete in the same way as that in VT2 .3. Mohr's circle was employed to track historical strains experienced during previous loadings.4. RC panels and walls under monolithic and cyclic loading were analyzed using modified FEAPpv program to verifiy the above-mentioned modeling method.The following achievements have been obtained:1. Full-range response of a structure can be accurately simulated by the proposed concrete model using displacement-controlled loading method.2. Consideration of the confinement on concrete after peak response can improve the accuracy of response of 2-D cracked reinforced concrete.3. Mohr's circle is effective to track historical strains, which can be used to simulate the response of RC panel and wall elements under reversed cyclic loading.
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