Seismic Behavior Research Of Precast Reinforced Concrete Shear Wall With Bolted Steel Plate Joints

Precast concrete shear wall system is a typical lateral load resisting system for high-rise buildings.The precast concrete shear wall structure has the advantages of simple installation,low labor intensity,fast construction speed and less wet work on site.According to the relevant experimental research,the joint at the seam part is a weak part of the precast concrete shear wall structure.Therefore,how to effectively and reliably connect the components at the seam part is particularly important.And reliable connection designing technology becomes the key to improve the mechanical performance of precast concrete shear wall structure.This paper aims to study the mechanical behaviors of precast concrete shear walls with bolted steel plate joints.Based on the previous experimental results of bolted steel plate joints tests,the numerical models of precast concrete shear walls with bolted steel plate joints were established by finite element software and behaviors of the precast shear walls under lateral loading were analyzed.The main works and conclusions are as follows:(1)By using the finite element analysis software MSC.Marc,we build the model by shell-solid elements.And a refined model is proposed to simulate the bolted steel plate joints of precast concrete shear wall.The numerical modle can effectively simulated the bolted steel plate joint with transverse gap,vertical gap or stiffeners.By comparison,the model can better simulate the test results.It provides a basic model for the further study of the bolted steel plate joints.(2)By using the finite element analysis software MSC.Marc,this paper analyzes some parameters that may affect the mechanical performance of the bolted steel plate joint.We discussed how the concrete strength grades,the steel plate with transverse gap,vertical gap will affect its force performance.The conclusion is: a bigger concrete strength grade will get a better force performance,and it will be more conducive to show advantages of the bolted steel plate joint.By changing the steel plate with different quantity and method,its force performance will be improved.This will help the steel plate to exert its buckling energy consumption.(3)By using the finite element analysis software OpenSees,we build an ordinary shear wall structure model called SW and a shear wall structure model with the bolted steel plate joints called RSW based on the prototype structure.And then we do the dynamic time history analysis under the action of selected seismic waves.The distribution of story drift ratio in structures RSW and SW under different aspect ratio,axial compression ratio and reinforcement ratio are discussed.The aspect ratio has a great influence on the story drift ratiodistribution of the structures SW and RSW.The maximum story drift ratio of the structure SW has an obvious increasing trend with the increase of the aspect ratio.Correspondingly,although the maximum story drift ratio of the structure RSW is increased,its rate of growth significantly smaller than the SW.The axial compression ratio has a certain influence on the story drift ratio distribution of the structures SW and RSW.The maximum story drift ratio of the structure SW has an obvious increasing trend with the increase of the axial compression ratio.Meanwhile,the maximum story drift ratio of the structure RSW does not have a significantly increasing.And the overall seismic capacity is also becoming more and more significant as the axial compression ratio increases.The reinforcement ratio has little effect on the story drift ratio distribution of the structures SW and RSW.And the maximum story drift ratio of the structural SW and RSW has no obviously change.