In view of the shortcomings of the existing precast concrete shear wall joint construction,such as low fault tolerance rate,large amount of concrete pouring operations on the construction site and excessively long reinforcement anchorage,a centralized reinforcement connection precast shear wall structure with ultra-high performance concrete(UHPC)was proposed.By comparing the quasi-static test results of one cast-in-place shear wall specimen and three centralized reinforcement connection prefabricated specimens with different joint forms,the failure law and seismic performance of this kind of prefabricated shear wall were revealed,and the effect of vertical joints on the seismic behavior of the wall and the stress characteristics of the connecting steel bars were clarified.In addition,ABAQUS software was used to conduct finite element simulation of the specimen,and the influence of axial compression ratio and concentrated reinforcement ratio on the seismic performance of the specimen was analyzed.The results show that the centralized reinforcement specimen and the cast-in-place specimen have the same failure law,and both are bending shear failure.The hysteresis curves of the two types of specimens are relatively full,the skeleton curve trend is basically the same,and the energy consumption capacity is close.The minimum bearing capacity of the centralized reinforced specimen is only 5.6%lower than that of the cast-in-place specimen,indicating that the seismic performance of prefabricated specimens is basically equal to that of cast-in-place specimens.Vertical joints have little influence on the bearing capacity of the wall,and weaken the ductility and energy dissipation capacity of the wall to some extent.The seismic performance of precast walls with different vertical joints is similar but different,the precast wall with UHPC rib-out lap in vertical joint form has better integrity,and the precast wall with U-shaped keyway has better stiffness and energy dissipation capacity.The stress distribution of the connected steel bar has the characteristics of typical flexural members.The stiffness and bearing capacity of the model increase with the increase of axial compression ratio,when the axial pressure ratio increase from 0.05 to 0.30,the largest peak load increase occurs when the axial pressure ratio increases from 0.05 to 0.10.Considering the improvement of bearing capacity,stiffness,energy dissipation and corner elevation,it is advisable to keep the concentrated reinforcement ratio of specimens at 90%-110%.
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