Experimental Study And Numerical Simulation On Seismic Performance Of Precast Shear Wall With Core Grouted Concrete

With the rapid development of housing industrialization in China,the prefabricated concrete structure has become research hotspot again because of its irreplaceable advantages.Precast shear wall with core grouted concrete is a new type of precast shear wall system and we are not familiar with it's mechanical performance.In order to recognize the seismic performance of this new precast shear wall,it is necessary to conduct a series of research on the influence of structural measures and various parameters on mechanical performance.In this article,the research on precast shear wall with core grouted concrete is based on pseudo static test and numerical simulation technology.A total of 4 specimens were designed for low frequency cyclic experiment and one of them is cast-in-place shear wall and the others are precast shear walls with different fabrication forms.Hysteretic loops and skeleton curves were drawn on the basis of experimental data.Bearing capacity?ductility?rigidity degeneration and energy dissipation capacity were analyzed,at the same time,comparing the performance of cast-in-place shear wall with precast shear wall.The test result indicates that the hysteretic loop of cast-in-place shear wall is plumper than precast shear walls',implying that the energy dissipation capacity of cast-in-place shear wall is better than precast shear walls;the skeleton curves of 4 specimens have parallel tendency and shape,indicating the similar bearing capacity;the ultimate drift ratio of the three precast shear wall with different fabrication forms are 1/54~1/71,which are larger than the story drift ratio demanded for shear wall structure in seismic design code of buildings;the 4 shear walls have similar law of rigidity degeneration,which degenerate fast before yield point and slower after yield point.Based on the existing experimental data and numerical simulation technique,finite element model of precast shear wall with core grouted concrete is established reasonably in using of general finite element analysis program ABAQUS.Then the influence of axial compression ratio and reinforcement ratio of edge members and wall body is analyzed systematically.The results of simulation match well with the experiment.Axial compression ratio has significant influence on mechanical performance and reinforcement ratio of edge members and wall body influence the ductility except bearing capacity.A further research about bearing capacity and deformability of this new prefabricated shear wall,precast shear wall with core grouted concrete,was conducted based on the results of test.A simple formula of bearing capacity and yield displacement was put forward.In order to prove the rationality of the formula,the calculated value was compared with experimental value and value of numerical simulation.