Study On Performance Of Vertical Energy Dissipation Joint And Horizontal Assembly Joint Of Reinforced Concrete Shear Wall

Prefabricated buildings are energy-saving,environmentally friendly,green and low-carbon in the construction process,which is a direction for future building development.The focus of prefabricated building research is on the joints between prefabricated components.This paper focuses on the study of vertical joints and horizontal joints of fabricated reinforced concrete shear walls.There is still room for improvement in the existing precast concrete shear wall connection method,and it is also necessary to propose a new connection method as a supplement to the existing connection method.In this paper,a design method of vertical energy-consuming shear-shear wall structure is proposed,and its energy-damping performance is studied.A new horizontal joint form,a partial rectangular steel pipe bolt connection,is proposed and cast-in-place.The shear wall was compared and the mechanical properties were studied.The research content mainly has the following parts.Open the vertical joint at the appropriate part of the shear wall,and add the energy-consuming steel plate into the vertical energy-consuming joint in the vertical joint(or the vertical joint of the shear wall).Firstly,the force and energy dissipation mechanism of the vertical energy-consuming shear wall are analyzed,and the theoretical calculation formulas of the coupling ratio CR and the elastic anti-lateral stiffness weakening R_K coefficient are deduced.The preliminary selection and design of energy-consuming steel plates were carried out,and the formula for calculating the elastic shear stiffness of semi-circular notched energy-consuming steel plates was derived.Based on the coupling ratio CR and elastic anti-lateral stiffness reduction coefficient R_K,a design method of vertical energy-consuming shear wall structure is proposed.Then,according to the design example,the corresponding finite element model is established.The static elastoplastic analysis of the finite element model verifies the correctness of the previously derived calculation formula and the rationality of the proposed design method.An ordinary shear wall structure was designed.Then a vertical energy-consuming shear wall structure was designed according to the proposed design method.The ABAQUS finite element model was established and its dynamic elastoplastic time history analysis was carried out to verify its Energy dissipation performance under earthquake action.In the finite model,the wall body adopts the shell element,the edge member steel bars are replaced by the same-area steel beam element,and the energy-consuming steel plate is simulated by the Slot connection element.Three seismic wave input models are selected,the results of dynamic elastoplastic time history analysis show that the vertical energy-consuming shear wall can reduce the vertex displacement response and the interstory displacement angle under most seismic waves.The vertical energy-consuming shear wall can reduce the the shear response of the foundation and the damage of the concrete wall under all seismic waves.The addition of the vertical energy-consuming jiont serves to protect the wall peer and improve the repairability and recoverability of the structure after the earthquake.Considering various indexes such as seismic response and post-earthquake wall damage,it is verified that the vertical energy-consuming shear wall structure has better energy dissipation performance.On the basis of summarizing the existing connection methods and research results,a local"steel"connection method is proposed,which is a new type of dry horizontal joint connection method.The connection scheme is to partially embed a rectangular steel pipe in the precast concrete shear wall and then bolt the rectangular steel pipe.The advantage of this connection is that the assembly is convenient,the connection is reliable,and the force is reasonable.A precast concrete shear wall with this connection method was designed,and the simplified theoretical calculation and finite element analysis of the ABAQUS finite element model were carried out and compared with the cast-in-place concrete shear wall.The finite analysis and theoretical calculations have proved that the main mechanical properties such as bearing capacity and ductility of this connection method meet the requirements.