Shear Strength Analysis Of Concrete Beams Based On Finite Element Method

The study on shear behavior of reinforced concrete structures has a history longer than a century, but a reasonable theory has still not been found to predict the shear behavior of structures accurately because of its complexity and the lack of research. The rapid development of the nonlinear finit element method has offered new ways to the study of shear behavior of reinforced concrete structures. In the same time, by using different kind of constitutive model of concrete, different results would be given from the finit element programs. Based on such problems, the main contents are including the following aspects:(1) The main methods of shear strength analysis are introduced suchas: truss theory, limit equilibrium theory, plastic theory, nonlinear finit element method, etc. The constitutive model of concrete has a great influence on the accuracy of nonlinear analysis of reinforced concrete structures, so the constitutive model theories such as elastic theory, elastic-plastic theory, damage theory will be introduced.(2) Both elastic-plastic constitutive model of concrete and damaged plasticity model for concrete are used in the finite element programs to analysis the shear strength of concrete structures, and their applicability will be showed by comparing the results with the experimental data. It shows that the damaged plasticity model for concrete is more applicable in the analysis of shear strength.(3) Analysis of the shear strength performance of RC and PCbeams under acceleration loads by using explicit nonlinear dynamic method. And it shows that the shear strength of both RC and PC beams increases under acceleration loads. But the the failure mode of PC beams under dynamic loads has changed compared to the situation of static loads.