| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 87 === In this thesis, a computer code is developed for 2D numerical simulations of reinforced concrete beams by the explicit finite element method (FEM). The material non-linearity of the concrete and the reinforcement are considered into the analysis. Besides, the bonding and sliding behaviors between the reinforcement and the concrete are modeled by using the so called "linkage element". Releasing the connecting nodes between neighboring elements is used to simulate the cracking behavior of concrete, once a failure criterion was satisfied. The main benefit of applying the explicit finite element method to conduct the analysis is the avoidance of solving large simultaneous equation. Then, it can save much storage space and some complex process, which is required by the implicit FEM.
In order to simulate the process of the real test of RC beams, a displacement control algorithm is written into the explicit finite element code. Four examples were studied to evaluate the performance of this newly developed RC structural analysis program. Through the study, it is found that the time step size of the explicit FEM is coupled with the element size and the material stiffness. For the displacement control algorithm, the size of displacement increment is also a critical factor for the convergence of the simulation.
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