Research On Performance Of Vertical Dry Connection Joint Of Assembled Shear Wall Structure

In this paper,a vertical dry connection joint design of fabricated shear wall for high-rise residential buildings is proposed,and the boundary optimization algorithm of steel shear key in this paper is further improved and test research is carried out.On this basis,the experimental research is carried out,which takes the difference degree of connection strength and the influence of reinforced floor slab into consideration.Based on the ABAQUS parameter analysis,the performance of the dry connection joints and the reasonable yield-coupling ratio are recommended.The vertical dry connection joint of fabricated shear wall is composed of steel shear key,pre-embedded steel plate,shear wall limb,and reinforced floor slab.The preembedded steel plate back welding stud is prefabricated on the surface of the shear wall,and the steel shear key's boundary is optimized by improved simulated annealing method,which is connected with the pre-embedded steel plate of the wall by welding.When the relative deformation occurs on seam in the joint,the shear key will provide stiffness,bearing capacity and energy consumption.Under the same calculation accuracy requirement,the existing boundary optimization algorithm for steel shear key based on simulated annealing method is improved,by increasing the calculation efficiency by 2.5 times.Further,the welding method and boundary selection in shear key design are studied through experiments.The test results show that the shear key performance is optimal after smooth treatment of the corners of the energy-consuming zone,open-hole plugging of the joint area and boundary optimization.Nine dry connection joint specimens are designed to carry out the quasi-static test,which are divided into the control group,the first group and the second group,and the control group was the whole wall.The first group are specimens without reinforced floor slab the degree of connection is “weak”,“standard”,“strong”.The test results show that the stiffness and peak bearing capacity of the dry connection joints are gradually improved compared with the whole wall,and all specimens in the first group have better ductility.As for the energy consumption,“standard” specimen and “strong” specimen are better than that the whole wall.The second group are specimens with reinforced floor slab and the degree of connection is “weak,standard,strong”.The design of shear key in second group is the same with first group.The test results show that the connection degree in higher taking the impact of the floor slab into consideratoin.The floor damage form is partial punching and shearing damage,and the maximum crack width of the “standard” specimen and “strong” specimen meet the specification requirements.On the whole,the new dry connection joint can be designed to ensure sufficient stiffness,proper bearing capacity,good ductility and energy consumption.Based on the finite element software ABAQUS,the yield coupling ratio is used as the variable to analyze the influence of the performance of the new connection joint.The analysis results show that:(1)When the yield coupling ratio is constant,the combination of size and quantity,the position have essentially no effect on the joint's performance.(2)With the increase of yield coupling ratio,the initial stiffness and peak bearing capacity increase ratio will be slowed down,and the peak bearing capacity will enter the platform segment.The energy consumption capacity and the shear key energy consumption ratio will both increase first and then decrease.(3)According to the factors of comprehensive stiffness,bearing capacity and energy consumption,the reasonable yield-coupling ratio ranges from 0.3 to 0.5 for the dry joint model in this paper.