Experimental Research On Seismic Behavior Of Precast Shear Wall With Horizontal Alveolar And Unbonded Type Connection

Housing industrialization is an important direction for China's construction industry.Prefabricated shear wall structure is suitable for a structural system housing industrialization in our country.For precast shear wall structure,reliable horizontal connection between the adjacent shear walls is the key to ensure the integrity and seismic capacity of the whole struture.In order to further enhance the shear capacity and energy dissipation capacity of precast shear walls,this paper puts forward the horizontal alveolar and unbonded type connection.Through low-cycle repeated tests and non-linear finite element analysis of the specimens finite element,the seismic behavior of precast shear wall with horizontal alveolar and unbonded type connection is reaearched.The main findings are described below:(1)The low-cycle repeated test of the precast shear wall with horizontal alveolar and unbonded type connection is made by using the axial compression ratio and the unbonded degree as parameters.When the specimens finally fail,the edge of the steel yields and the bottom of the concrete wall crushes.There is no obvious horizontal slip in the specimen during the entire loading process,indicating that the connection performance of horizontal alveolar and unbonded type connection is reliable.The energy dissipation capacity,deformation capacity and ductility of precast shear wall with horizontal alveolar and unbonded type connection are also very good.With the increase of the axial compression ratio,the bearing capacity of the specimen increases,but the ductility and energy dissipation capacity deteriorate.With the increase of the unbonded degree,the bearing capacity of the specimen is almost the same,but the ductility and energy dissipation capacity of the specimen are obviously enhanced.(2)The comparison of seismic behavior among precast shear wall with horizontal alveolar and unbonded type connection,precast shear wall with flat surface connection and the cast-in-situ shear wall are made.The results show that precast shear wall with horizontal alveolar and unbonded type connection shares similar bearing capacity with precast shear wall with flat surface connection and the cast-in-situ shear wall,but it is superior to the other two shear walls in terms of ductility and energy dissipation.(3)The finite element software is used to simulate the test specimen and verified by the test results.The results show that with the increase of the axial compression ratio,the bearing capacity of the structure increases,but the ductility and energy dissipation capacity are weakened.With the increase of unbonded degree,the structural bearing capacity remained unchanged,but the ductility and energy consumption are increasing.And the unbonded reinforcement of the boundary elements can improve the seismic behavior of the structure more effectively.With the increase of the unbonded length,the structure bearing capacity remains unchanged,but ductility and energy dissipation capacity are obviously enhanced.Through the above experimental study and finite element analysis,it can be seen that the horizontal alveolar and unbonded type connection can not only ensure the overall performance of the shear wall,but also effectively enhance the ductility and energy dissipation capacity of the shear wall.This type of horizontal connection is convenient,effective,and has great application prospects.