| The research on the shear of reinforced concrete has a history of over a hundred years, especially since the mid-20th century, when a lot of experimental and theoretical analyses have been made by scholars around the world. Because of the complex stress state of components and interactions of various parameters related to the shear of structure, there is no generally accepted analysis model or unified formula at home and aboard. This research made an introduction of four methods of analysis of the shear strength: truss theory, ultimate equilibrium theory, statistical analysis and non-linear finite element analysis, mainly focusing on the truss theory in European and American codes and the popular non-linear finite element method. Based on the failure mechanism of the inclined section, this research proposed the formula of shear strengthening. In order to verify the correctness of this formula, this research had made 12 shear strengthening experiments, of which results had proved that the formula is correct and updated the parameters of this formula.Non-linear finite element analysis of reinforced concrete can accurately analyze the entire process of reinforced concrete beams under flexure and shear load, including stress distribution, deformation, appearance and development of cracks, failure mode and ultimate bearing capability. The finite element model in this research can completely simulate the entire process of reinforced concrete beams under flexure and shear load until failure. The results of the numerical analysis of reinforced concrete beams agreed well with those of experiments, meaning that this finite element model could solve some special issues in shear strengthening.
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