Modification on analysis models of ultimate strength of RC shear wall with opening

The purpose of research was to develop an analysis model to evaluate the ultimate strength of RC shear wall with opening based on the shear resistant mechanism.According to the existing shear resistant mechanism("M-M" model),modified "M-M" model was proposed and its shear resistant mechanism can be simplified as a composition of concrete strut a1with an inclination angle of θ1on the right side of the opening,concrete strut a2 with an inclination angle θ2 on the left side of the opening,longitudinal reinforcement bars and horizontal reinforcement bars under the opening of RC shear wall.The calculating equations for ultimate strength were provided from "M-M" model as well as modified "M-M" model and a computing program was developed to evaluate the strength of RC shear wall with opening.Comparison of ultimate strength tested with those obtained from two models by analysis was accomplished by this program.The analysis results show that the modified "M-M" model has better agreement with the test result,therefore,it can be concluded that the modified "M-M" model can better simulate the ultimate strength of RC shear wall with opening inpractice,and can be used to evaluate the strength of RC shear wall with opening.