Finite Element Analysis Of Seismic Behavior Of Prefabricated Hollow Concrete Shear Wall

With the increase of social labor costs and the national attention to the environment,the construction technology and form are also changing constantly,and the prefabricated structure has emerged and developed rapidly.With the advantages of short cycle,high efficiency,fast progress,small pollution,high anti-interference and low labor consumption,the prefabricated building can significantly improve the construction quality while promoting the industrialization level of the building and make outstanding contributions to the sustainable development of the society.The existence of these advantages has greatly promoted this building technology.The practice of construction projects shows that construction is more in line with the development of China's construction industry,and is an important measure for the innovation and development of the construction industry.In thisthesis,a new type of fabricated structure-prefabricated hollow shear wall structure is analyzed and studied by finite element,the main research contents are as follows:(1)shear walls through the existing test data,using the finite element software to establish the same prefabricated hollow shear wall model,this paper compares and analyzes to verify the feasibility of the analysis of finite element software;(2)according to the existing test model,respectively using ABAQUS finite element analysis to establish the 1 piece of precast hollow shear wall and cast-in-place shear wall model,through the simulation of low reversed cyclic loading experiment,analyzes the model of the failure pattern,hysteresis curves,skeleton curves,etc.,the final validation of prefabricated hollow shear wall simulation is feasible.(3)ABAQUS finite element analysis is carried out on one of the prefabricated hollow concrete shear walls to analyze the influence of changes in its axial compression ratio,strength of concrete inside the hole,reinforcement ratio of concrete inside the hole and other parameters on the performance of the shear wall,mainly including the influence of skeleton curve,ductility,energy dissipation capacity and stiffness degradation.Through the analysis of the test results,the following conclusions are drawn:1.Through comparative analysis of precast hollow shear wall and cast-in-place shear wall specimens,it can be seen that the failure forms of them are of small difference,which are typical compression-bending failure forms.They are shown as the tensile yield of vertical reinforcement and the bottom pressure of concrete in tensile zone and compression zone respectively.The results analyzed by finite element software analysis of ABAQUSare approximately the same as the experimental results.2.The skeletal curves of prefabricated hollow shear wall and cast-in-place shear wall obtained by finite element software analysis of ABAQUS are compared with the experimental analysis results,and the results show basically the same curve characteristics,showing the stages of elasticity,elastoplastic and falling.3.The performance of prefabricated hollow shear wall and cast-in-place shear wall obtained by finite element analysis of ABAQUS is basically consistent,and the hysteresis curve of prefabricated shear wall is relatively full.4.According to the analysis of parameters of precast hollow shear wall,within a certain range of axial pressure ratio,the bearing capacity and stiffness of shear wall with high axial pressure are larger;As the concrete strength inside the hole increases,the bearing capacity of the shear wall increases.However,as the concrete strength increases,the ductility coefficient of the shear walldecreases.The bearing capacity and energy dissipation capacity of shear wall can be improved by increasing the ratio of concrete reinforcement in the hole.The concrete strength at the connection between precast wall and ground beam has a certain influence on the seismic performance of this kind of shear wall.