Study On Seismic Performance Of Prefabricated Shear Wall With Sleeve Connection

In this paper,the seismic performance of a new prefabricated shear wall with a telescopic connection and no boundary constraints is studied,including the pseudo-static pushover test and theoretical model study.The test analysis and comparative study were carried out on the elongated grouting sleeve connecting the prefabricated shear wall with an axial compression ratio of 0.15 and the large-diameter and large-spacing grouting sleeve connecting the prefabricated shear wall with an axial compression ratio of 0.30.Based on the experimental data,this kind of shear wall is identified and analyzed by the multi-vertical bar element model.Through observation of test phenomena and comparative analysis of test data,it is concluded that the failure modes of precast shear wall specimens and cast-in-situ shear wall specimens are basically the same in the process of pseudo-static pushover test.During the failure,the cracks are mainly concentrated in the range of 1/3 wall height at the bottom of the component,with horizontal oblique cracks as the main part,and there are basically no cracks on the wall.The concrete at the bottom of the shear wall is damaged under compression,and the damage is most obvious at the left and right corners,where the concrete falls off and the rebar is exposed.The hysteretic curves of the specimens show pinching phenomenon,which is more obvious in shear wall specimens with a height-width ratio of 1.40 and a height-width ratio of 1.65.The macroscopic model of multi-vertical bar element was adopted to simulate the stress on the shear wall specimen,and the material constitutive relation curve in the model was fitted based on the test data,mainly including the strength,stiffness,linearity and other characteristics of the material.It provides a simple and efficient analysis method for the seismic performance analysis of a new type of precast shear wall with sleeve connection members without edge constraints.The results show that the macroscopic model of multi-vertical bar element can simulate the behavior of shear wall simply and quickly.Through the macroscopic unit simulation,it can be concluded that this new type of shear wall specimen can give full play to the material strength in the process of stress,but the stiffness characteristics can not played.The seismic performance of the precast shear wall specimens with elongated grouting sleeve is superior to that of the specimens with large diameter and large spacing grouting sleeve connection.The bearing capacity of cast-in-place shear wall specimens with extended connection of grout sleeve is higher than that of cast-in-place shear wall specimens under the same condition.The ultimate displacement Angle of the extended grout sleeve shear wall is slightly smaller than that of the large-diameter and large-spacing shear wall,but it still meets the requirements of the code.Among the shear walls connected by grouting sleeve with large diameter and spacing,the large spacing has a great influence on the transfer of forces on the whole and horizontal joints of the shear wall.It can be obtained from the forces exerted on all specimens: the overall stiffness of the shear wall without boundary constraints is low,and the smaller the aspect ratio is,the greater the impact on the stiffness of the specimen material will be.