Experimental Study On Seismic Behavior Of Precast Reinforced Concrete Shear Walls With Reinforcement Spliced By Grout-filled Sleeves

Recently,prefabricated concrete structure system has been widely concerned and supported by policies for its advantages of high industrialization,short construction period,high construction quality,energy conservation and environmental protection.The effective joint connection suitable for prefabricated shear wall structure become a hot spot of current research.Considering the connection problem of vertical and horizontal joint interfaces of prefabricated shear wall,this paper puts forward a combination scheme of "partial assembly and partial castin-place",which is that the horizontal interface are connected by quincuncial layout grouted sleeve,and the vertical interface are connected by cast-in-place U-type reinforcements ferrule lap.This scheme not only meets requirements of the assembly integrity and applicability but also makes precast shear wall have high bearing capacity.The main works and results are as follows:(1)The quasi-static tests were carried out including one cast-in-place shear wall and three prefabricated shear walls with the scale of 1:2 and the shear span ratio of 1.0,1.4 and 1.7 respectively.The test results indicate that all the specimens are flexural failure,the crack distribution area of prefabricated walls is different from that of cast-in-place wall.The cracks of prefabricated walls are densest around the height of the upper end of the sleeve and within the range of 150 mm upward,and the cracks of cast-in-place wall are densest within the range of 500 mm height from bottom section above.The grouted sleeve connector can effectively transfer the stress of the reinforcement,and the vulnerable position of this connection is located at the lower part of the reinforcement,and the vertical joint with U-type reinforcements ferrule lap basically has no crack and good integrity;the peak bearing capacity of the precast shear wall basically meets the requirements of the current code,but slightly lower than that of the cast-in-place shear wall,and is superior to the cast-in-place shear wall in terms of deformation,energy-dissipation capability,rigidity and strength degradation;with the increase of the shear span ratio of the precast shear wall,the bearing capacity,rigidity and the proportion of horizontal relative sliding deformation will decrease,and the ductility will increase;The horizontal relative sliding deformation ratio of prefabricated wall is between 4% and 10%,which cannot be ignored.(2)The finite element analysis software ABAQUS is applied to carried out the numerical simulation of four specimens,the simulation results are basically consistent with the test results,and the effects of friction coefficient,shear span ratio and axial compression ratio on the bearing capacity and slip deformation of specimens are analyzed.,which lays the foundation for the follow-up study.The research results of this paper provide experimental data and theoretical basis for seismic design of precast shear wall considering vertical and horizontal joints,and is of reference significance for the engineering design and application.