Test And Research On Seismic Performance Of All-lightweight Aggregate Concrete Shear Wall

Now,most of the existing buildings are the frame—shear wall structure system.Using ordinary concrete to pour shear walls.In the seismic action,shear wall is the main component to resist lateral force.To this issue,this paper presents a new form of shear wall reinforcement,and uses all-lightweight aggregate concrete to pour shear walls.All-lightweight aggregate concrete as a lightweight material,is a kind of lightweight aggregate concrete,which made from ceramsite as coarse aggregate and ceramic sand as fine aggregate.It has the characteristics of light,high-strength,thermal insulation and refractory,etc.Its deformation performance is good and modulus of elasticity is high.In general,shrinkage and creep are low.Now take this shear wall of all-lightweight aggregate concrete as the research object.By combining finite element simulation analysis and test results,to analyse and research the seismic performance of all-lightweight aggregate concrete shear wall.The finite element analysis software ABAQUS was used to set up shear wall model.Through the non-linear finite element analysis method to research the seismic performance influence of all-lightweight aggregate concrete shear wall under the different forms of reinforcement and different axial compression ratios.Comparing and analysing the test results are shown that this new form of reinforcement can provide a strong binding to the all-lightweight aggregate concrete,delay the occurrence of cracking and continue to develop.The influence of axial compression ratio on the all-lightweight aggregate concrete shear wall is bigger.With the axial compression ratio increases,the bearing capacity of all-lightweight aggregate concrete shear wall increases,the limit displacement and ductility performance decrease.After the load reaches to the ultimate load,with the displacement increases,the bearing capacity of each shear wall appears varying degrees of decline.But the bearing capacity of shear wall with diagonal brace reinforcement falls slower.It shows that setting diagonal bracing reinforcement reasonably can improve the ultimate bearing capacity and ductility performance effectively.To researsh the seismic performance of all-lightweight aggregate concrete shear wall under the different forms of reinforcement and axial compression ratio,this paper takes four pieces of all-lightweight aggregate concrete shear wall specimen to carry out pseudo-static testing.And under the action of simulate earthquake to analyse failure mechanism,hysteretic behaviors,stiffness degradation,ductility performance,energy-dissipating capacity,etc.To provide a certain theoretical basis for the seismic design standard of all-lightweight aggregate structure.The test results show that The damage form of all-lightweight aggregate concrete is mainly aggregate fracture damage.Compared with ordinary reinforcement in the form of all-lightweight aggregate concrete shear wall,which all-lightweight aggregate concrete shear wall equipped with a diagonal brace,cracks appear later and carry out more,The width of the cracks are small and fracture spacing is close.Diagonal brace is not obvious effect on yield of the specimens,but the cracking load and ultimate load are improved obviously.The hysteretic curve of all-lightweight aggregate concrete shear wall which sets diagonal bracing reinforcement,is more full and in the middle of shrinkage phenomenon is weaker.The speed of stiffness degradation slow down,ultimate bearing capacity,ductility performance and energy-dissipating capacity are improved.Under the condition of increasing axial compression ratio,the ultimate bearing capacity of all-lightweight aggregate concrete shear wall increase,ductility performance weaken,limit displacement decline.The all damage phenomenons of all-lightweight aggregate concrete shear wall are all-lightweight aggregate concrete crushed in the corner.Through the analysis of the finite element calculation and test results shows that,the fitting degree of finite element simulation analysis results and test results is good.The all-lightweight aggregate concrete shear wall has a certain energy-dissipating capacity and ductility performance.It can provide a certain theoretical reference for the use of actual engineering structure.