Study On The Seismic Performance Of Gravity Type Rocking Shear Wall Structure

Traditional cast-in shear wall has been recognized by all circles of the industry for its good displacement ductility and energy dissipation performance and has been applied in structural design to resist horizontal seismic force.However,when it enters the elastoplastic stage,the seismic energy is dissipated due to its own damage.Therefore,it is difficult or impossible for the construction personnel to repair the shear wall causing severe damage.If the severely damaged structure is tom down and rebuilt,it will not only eost a lot of money and cause serious economic losses to the society,but also affect the normal function of the structure after the earthquake,and aflFect people's life,work and rest.In recent years,China has suffered a number of serious earthquake disasters.The precast concrete shear wall has shown good integrity and energy dissipation performance during the earthquake process,attracting the attention of researchers.Since then,the research on precast shear wall has been more in-depth.Based on this,researchers propose and further study the recoverable functional structure.The purpose is to realize the normal function of the structure even after the structure experiences a large degree of earthquake disaster with a little or no repair.In this paper,the gravity swing shear wall structure,one of the recoverable functional structures,is studied in depth.This form of shear wall structure makes up for the deficiency of the traditional self-resetting rocking shear wall foot bearing capacity and prevents damage to the wall caused by stress concentration.Due to the unfixed connection between the wall footing and the foundation beam,the constraint of the wall footing is released.When the horizontal load overcomes the bending moment generated by the vertical load,the wall can achieve the shaking state so as to achieve the seismic purpose.When the horizontal load disappears,the vertical load provided by the jack and other vertical loads such as its own gravity can provide self-restoring force for the structure to realize the structured recovery function.This paper mainly studies the following aspects:(1)On the basis of the existing theory of self-resetting swaying shear wall,the gravity swaying shear wall is studied in depth,and the specimen design,material characteristics measurement,specimen fabrieation and hoisting,test and other steps are carried out for this type of structure.(2)The experimental results show that the structure has good self-resetting performance on the basis of satisfying the good displacement ductility of the traditional shear wall.By comparing the horizontal bearing capacity under different vertical load(3)levels,it can be found that the horizontal bearing capacity increases with the increase of vertical load,which is completely consistent with the theoretical analysis.Since the wall does not enter the elastoplastic state when it reaches the target displacement and the structure has no energy-consuming components,the energy dissipation capacity of the structure is weak.(4)In this paper,the gravity rockinging shear wall were analyzed using ABAQUS finite element software,finite element simulation analysis was introduced in detail,and the specific steps and the selection of material constitutive made a more detailed instructions.numerical simulation for the wall to validate the wall when the rocking load-displacement curve slope break the theory analysis,and verifies the reliability of the model.