Experimental Study On Seismic Behabior Of Prefabricated Energy-Dissipating Shear Wall With End Columus

With the rapid development of urbanization in China,prefabricated structure has been widely promoted in order to meet the major needs of construction industrialization and housing industrialization development in China.The prefabricated shear wall is rising gradually in China.Many high-rise and small high-rise residential structures in China adopt this structure form.Compared with traditional cast-in-place buildings,prefabricated buildings save construction costs,protect the environment and meet the needs of green building development.As is known to all,shear wall structure as a lateral force component,since the weight,poor ductility,damage is difficult to repair.Therefore,a prefabricated energy-dissipating shear wall with end column is proposed in this paper,that is,a method of installing soft steel dampers as dry connectors at the vertical joints of the shear wall to assemble the prefabricated wall.On the one hand,it can reduce the amount of horizontal reinforcement connections and wet work on site,which is conducive to construction quality control.On the other hand,the good energy dissipation characteristics of soft steel dampers can be used to consume seismic energy and improve the seismic performance of structures.This paper studies the advantages and disadvantages of setting dampers at vertical joints of shear wall to connect the wall with cast-in-place wall by conducting quasi-static tests on five-piece scaled wall.The dampers are connected by welding and bolt.The damper used in this test is double "X" type damper,which is optimized in size,and its hysteretic curve is analyzed by finite element.It has good energy dissipation capacity.Through the quasi-static test,the following conclusions can be drawn: prefabricated shear walls have good seismic performance and energy dissipation capacity,and some seismic indexes are better than cast-in-place shear walls.The precast shear wall is almost identical to the existing punching wall.The main failure forms of the specimens are shear failure,longitudinal reinforcement tensile yield,column or wall Angle concrete compressive failure,and the final failure crack of the shear wall is in the shape of "X".The hysteresis curve of the wall to which the force is put in advance is more fulfilled than to force the wall.The hysteresis curve of the welded shear wall with damper is arch shape,and the energy consumption is obvious.The bolted shear wall with damper is roughly the same as that of the cast-in-place shear wall.The load force on the wall is slightly higher than the shear wall,but the rate of stiffness degradation is basically the same as that of prefabricated shear wall.From the aspect of ductility analysis,the prefabricated shear wall is obviously better than the cast-in-place shear wall,and the ductility factor of the test piece is more than 40% higher than the current push out wall,so the specimens have good ductility performance.From the analysis of the energy dissipation capacity of the specimen,the shear wall welded with damper is obviously better than the cast-in wall,and the cumulative energy consumption is larger.The shear wall bolted with damper is basically the same as the cast-in wall,which indicates that the damper contributes more to the energy consumption of the whole structure,plays a protective role,and can act as the anti-seismic defense line.Finally,some suggestions are provided for the optimization and follow-up research of the prefabricated shear wall structure design.