Seismic Performance Test And Seismic Vulnerability Analysis Of New Type Of Recycled Concrete Shear Wall

With the accelerating process of urbanization,construction waste has accounted for30%-40% of the total municipal waste,and the most important part of which is waste concrete.In order to solve the problem of single use of wall materials and municipal solid waste and prefabricated shear wall structure,the research group selected waste brick as the substrate and the recycled brick aggregate concrete.In this paper,the seismic performance test of the new type of recycled concrete shear wall is carried out to study the influence of basic parameters such as recycled concrete wall material and horizontal connection method on the basic mechanical properties of the wall;The nonlinear numerical expansion model of shear wall based on parameter change is established,and the influence of different key parameters on the seismic performance of shear wall is compared and analyzed;Based on the IDA method,the seismic vulnerability of the new type of regenerated concrete shear wall structure is analyzed,and the seismic capacity of the structural system is studied.The main contents and achievements of this paper include:1.Through the 4 blocks 1/2 ratio of the new-type reclaimed concrete shear wall structure,The influence of basic parameters such as recycled concrete(0% and 1.0%steel fiber)and different horizontal connection methods(horse lattice,rough surface)on the seismic performance of new type of regenerated concrete shear wall was studied.The results of the experimental study and analysis show that:1)Compared with ordinary concrete wall,the hysteresis curve is similar to that of ordinary concrete wall,and the law of stiffness degradation is basically the same.Among them,the peak load of recycled concrete wall is higher than that of ordinary concrete wall,which indicates that recycled concrete can replace ordinary concrete in engineering practice and can give fullplay to the seismic capacity of wall;2)The addition of steel fiber can improve the ultimate bearing capacity of the wall and inhibit the development of concrete cracks,but it has little effect on the rigidity of the wall;3)The in-situ components of the lattice wall are better than those of the prefabricated wallboard,and the overall cooperative performance is better in the process of stress.While the overall performance of rough surface of the wall is poor,the edge of the component damage is more serious,shear slippage phenomenon is more obvious.2.On the basis of the experimental study,the nonlinear numerical model of the specimen is established,and the experimental results are compared with the numerical simulation results.On the basis of the experimental study,the nonlinear numerical model of the specimen is established,and the experimental results are compared with the numerical simulation results.The influence of the reinforcement ratio,the axial compression ratio and the aspect ratio on the seismic performance of the new type of assembled recycled concrete shear wall are compared and analyzed by numerical analysis based on the parameter change.The results show:1)The bearing capacity of the specimen increases with the increase of the reinforcement ratio of the edge restraining member,and the ultimate displacement and ductility are also improved;2)The bearing capacity of the specimen increases with the increase of the axial compression ratio.The greater the axial ratio,the more obvious the effect on the wall constraints,can prevent further cracks in the wall cracks,can enhance the integrity of the specimen,but the increase in axial compression ratio will reduce the ductility of the wall;3)The bearing capacity of the specimen decreases obviously with the increase of the aspect ratio,but the displacement and ductility of the wall will be improved.3.This paper describes the basic theory of incremental dynamic analysis(IDA),establishes a new structural analysis model of the regenerated concrete shear wall structure,selects the appropriate ground motion records,analyzes the nonlinear dynamic response of the structure,and obtains the IDA curve of the structure under the limit state.The relationship between the structural earthquake demand and the seismic intensity is established,and the vulnerability curve of the structure is given.After analysis:1)With the increase of the ground motion intensity,the shear wall model gradually enters the plastic state from the elasticity,and the maximum interlayerdisplacement angle gradually increases from the linear increase to the nonlinear increase;2)With the increase of ground motion intensity,the transcendence probability of all kinds of damage states increases with the increase of ground motion intensity.With the shear wall from the basic development to the failure state,the vulnerability curve of the shear wall model is gradually gentle;3)Under the action of rare earthquakes,the probability of subtle damage,moderate failure,serious damage and collapse of the model is reduced from about 80% to about 0%,which indicates that the structure will not be seriously damaged and collapsed.