Experimental Investigation Of Mechanical Behavior Of Ring Joint For Prefabricated Shear Wall

The development of prefabricated buildings can solve the problem of rising construction costs caused by rising labor costs in our country at present and in the future.Prefabricated buildings have the advantages of being able to achieve rapid assembly,reducing the number of construction workers on the construction site,energy saving and environmental protection.This paper proposes a prefabricated shear wall horizontal joint U-shaped reinforcement lap joint connection form to solve the problem of traditional U-shaped reinforcement blocking the assembly of composite beams.The overlapping form of the horizontal joint can reduce the height of the post-pouring belt,the construction tolerance is large,and the construction can be quickly assembled.Therefore,in order to verify and improve the seismic performance of the prefabricated prefabricated shear wall horizontal splicing U-shaped reinforcement lap joint connection form,a total of four test pieces were designed for the test,including the test of a new prefabricated shear wall connected by the U-shaped reinforcement.A test piece of a prefabricated shear wall connected with two new U-shaped bars with different additional steel bars,and a comparative test piece of cast-in-place shear wall.Low-cycle repeated tests were conducted on the four specimens,and then the numerical simulation analysis method was used for further analysis.The main research conclusions of this paper are as follows:(1)The failure process of the four specimens is similar,belonging to compression and bending failure,and the precast shear wall with new U-shaped reinforcement connection can exert the same stiffness degradation ability,energy consumption capacity,bearing capacity and load capacity as the cast-in-place specimen.Deformability(2)Increasing the diameter of the outermost additional steel bars of the concealed column of the prefabricated specimens can delay the specimens from entering the yielding state,and at the same time reduce the deformation capacity of the specimens,and the precast shear walls with additional reinforcing steels are stronger than cast-in-place shear walls.Energy consumption capacity;(3)Under the action of high axial compression ratio,the prefabricated shear wall with trapezoidal additional reinforcement can overcome the load of cast-in-place shear wall,prefabricated shear wall and prefabricated shear wall with inverted U-shaped additional reinforcement in the load drop stage Mutation problem(4)Four specimen models were established through the ABAQUS analysis software for numerical simulation analysis.It can be seen that the results of the analysis model are consistent with the test results,which can be used as a reference for engineering applications,and increasing the shear span ratio of the specimen will reduce the shear bearing capacity of the specimen.To increase the axial compression ratio,the shear bearing capacity of the precast shear wall can be improved.Through the combination of experiment and numerical simulation analysis,the feasibility of the prefabricated shear wall horizontal joint U-shaped reinforcement lap joint connection form is verified,and its seismic performance is similar to that of the cast-in-place test piece.At the same time,the additional reinforcement form is studied.The influence on the prefabricated test piece is of great significance to the design and application of engineering practice.