In order to explore the seismic performance of flexural shear and shear failure pier column and numerical analysis model,reflecting bending-shear failure mechanism of pier column based on the quasi-static test results of flexural shear and shear failure pier columns,considering the influence of shear-span ratio and section hoop ratio on the shear strength and ductile deformation ability of pier columns,a formula for calculating the rotation angle of plastic hinge area of pier columns at the moment of shear failure was proposed.The proposed formula was compared with Leborgne formula and Ghannoum formula.Based on the OpenSees numerical analysis platform,two refined analysis models considering elastic shear effect and bending-shear coupling effect were established from section level and element level respectively,and the numerical analysis model was verified by the test pier column results in PEER database.The results show that the proposed formula can monitor the moment of shear failure more accurately,and the numerical model considering the coupling effect of bending and shear can simulate the shear strength,stiffness degradation and pinching phenomenon of reinforced concrete pier column better,which is in good agreement with the test results.The numerical model considering elastic shear effect can not well reflect shear failure and stiffness degradation.
关键词
钢筋混凝土墩柱/非线性剪切效应/弯剪耦合/滞回曲线/数值模型
Key words
reinforced concrete pier column/nonlinear shear action/flexural-shear coupling/hys-teretic curve/numerical model
维普
万方数据