Experimental Research On Seismic Performance Of An Assembled Monolithic Concrete Shear Wall

Assembled monolithic concrete shear wall is an important residential industrialized structural system,which has broad prospects for development and is suitable for the development of the domestic industrialization of residential structure system.Compared with the cast-in-place concrete shear wall,the joint performance of the horizontal joint is the key part to ensure the assembled monolithic concrete shear wall with good seismic performance.It is significant for the development of residential industrialization to improve the mechanical properties and the construction speed of horizontal joint.An innovative connection method of post-cast strip with X-shaped oblique reinforcement was proposed.Three precast specimens and a cast-in-place specimen were tested and compared under quasi-static test to investigate the influences of post-cast strip with different height on the seismic performance of precast specimens.It is shown from the results that the failure pattern of the precast specimens is nearly the same as that of the cast-in-place specimen.Lateral bearing capacity of the precast specimens is smaller than that of the cast-in-place specimen.Deformability and ductility of PC-1 are relatively better.The post-cast strip of the wall bottom has impact on seismic performance.Assembled monolithic concrete shear wall with reasonable horizontal joints can achieve similar seismic performance to the cast-in-place specimen.The finite element model was established with ANSYS,and the calculated results were in good agreement with the experimental values.The finite element model with the height of the horizontal joint of 500 mm was used to analyze the influence of parameters on the shear wall.It is shown from the results that the shear capacity of the shear wall can be increased by the X-shaped oblique reinforcement in the horizontal joint.When the horizontal joint concrete is high in strength,the seismic performance of the assembled monolithic concrete shear wall can be equivalent to that of cast-in-place shear wall.The improved assembled monolithic concrete shear wall was analyzed by using this model because of low utilization of the X-shaped oblique reinforcement.The results show that compared with the precast concrete shear wall with X-shaped oblique reinforcement,the lateral bearing capacity of the precast concrete shear wall with section steel can be increased by 41%.The reinforcement stress is concentrated at the position of 500 mm to 1200 mm above the horizontal joint because of the section steel.It is the precast concrete shear wall with section steel that makes the concrete stress distribute uniformly and is no stress concentration in the horizontal joint.The seismic performance of horizontal joint can be improved with the section steel.