Analysis On Seismic Performance Of Precast Shear Wall With Shear Studs

The assembled monolithic concrete structure combines the advantages of both cast-in-place monolithic and prefabricated assembly,saves the formwork,improves the construction efficiency,reduces the labor cost,and has been widely researched and applied in civil engineering.However,during the connection process of prefabricated shear walls,there will be a large number of horizontal joints.The quality of joints is more uncontrollable due to the difference in worker’s technical level and pouring time,and it is easy to form horizontal through joints under the action of large earthquakes.This will result in shear slip damage,affecting the bearing capacity and stability of the structure.In order to improve the integrity of the structure and the shear capacity at the joints,it is not economical to increase the diameter of the vertical reinforcement in the wall.Therefore,this article intends to propose a new connection method based on the shear resistance of the studs to improve the shear bearing capacity of the joints,so as to ensure the integrity of the assembled shear wall.The main research contents and results of this article are as follows:1.Determine the model and analysis method suitable for the finite element analysis of the assembled shear wallBased on the previous results of the research group on the seismic performance of the shear wall,the appropriate concrete and steel constitutive model were selected,and different modeling methods were used to establish the assembled sleeve grouting connected shear wall model.The simulation results were compared with the test results,so as to determine the feasibility of the selected calculation model and analysis method.Comparative analysis results show that: the sleeve simulated by the shell element and the frictional contact modeling method for horizontal joints can effectively simulate the damage of the wall.The simulation results agree with the experimental results.2.Design and analyze the effect of different construction methods of horizontal joints on the seismic performance of shear wallsThe connection method based on the shear resistance of the studs was proposed.The effects of different construction methods such as adding studs at the horizontal joints,changing the number of studs,and replacing the sleeve connection with the stud connection on the seismic performance of the shear wall were studied.The results show that the stud connection has better energy consumption than the sleeve grouting connection,and can significantly reduce the relative displacement of the horizontal joints,thereby improving the integrity of the structure.Compared with the sleeve grouting connection,the energy dissipation capacity of the shear wall using stud connection is increased by 16.7%,and the relative displacement of the horizontal joint is reduced by 72%.3.Reveal the influence of different parameters on the seismic behavior of the assembled shear wall based on the shear resistance of studsThe construction method of edge grouting connection through sleeve grouting and middle part through stud connection was used to further study the influence law of stud diameter,stud strength and axial compression ratio on seismic performance of assembled shear wall.Based on the sensitivity analysis method,the influence of the relevant parameters on the seismic performance index of the shear wall is analyzed.The results of the study show that increasing the diameter and strength of the stud has negligible effect on the bearing capacity and energy dissipation capacity of the wall,but it can significantly inhibit the relative displacement at the horizontal joint.Increasing the stud diameter has a more significant effect on the relative displacement of the horizontal joint than increasing the stud strength.If the stud diameter and stud strength increase by 20%,the relative displacement of horizontal joints decreases by 15% and 3%,respectively;the axial compression ratio has a greater impact on the seismic performance of the assembled shear wall based on stud shear.The axial compression ratio can significantly improve the bearing capacity of the shear wall and reduce the relative displacement of the horizontal joint,but at the same time it will reduce the energy dissipation capacity of the shear wall.Compared with the axial compression ratio of 0.12,the bearing capacity of the wall having the axial compression ratio is 0.4 is increased by 35.3%,with the relative displacement of the horizontal joint reducing by 27.9% and the energy consumption capacity decreasing by 18.2%.The horizontal joint that adopts a new type of connection can simplify the construction process,improve the integrity of the connection,and has certain economical efficiency.