| Superimposed slab shear wall has the advantages of high construction efficiency,high degree of industrialization,green environmental protection and so on.Existing superimposed slab shear wall panel mostly uses triangular lattice steel truss as fittings,will be on one side of the precast slab maintenance good to flip the other side of the embedded precast slab and again after the maintenance form double slab structure,and the board through the panel reserve reinforced connection between the joint,integrity is difficult to get enough assurance,complex and the construction process.For this reason,the research group proposed that circular groove structure should be adopted on the inside of precast wall panel to enhance the integrity of superimposed slab shear wall,and then proposed the design idea of using precast wall panel to directly set the tensile bar in the concrete pouring behind the cavity for lap anchorage + setting the cast-in-place edge members.In this paper,based on the improved structural measures of innovative superimposed slab shear wall proposed by our research group,5 full-size specimens of the innovative superimposed slab shear wall and 1 cast-in-place shear wall were designed and compared with each other considering the influence of axial compression ratio.Combined with the experimental phenomena and data arrangement,the effects of axial compression ratio on the seismic performance of specimens such as failure pattern,hysteretic performance,bearing capacity,seismic ductility,lateral stiffness and energy dissipation capacity were analyzed,and the performance of the specimens was compared with that of the cast-in-place shear wall specimens.At the same time,the finite element software ABAQUS was used to simulate the innovative superimposed slab shear wall specimens,and the feasibility of the finite element model was verified.The results show that the failure pattern of the innovative superimposed slab shear wall is similar to that of the cast-in-place shear wall.The initial stiffness is only 7.21%lower than that of the cast-in-place specimens,while the bearing capacity is 16% higher than that of the cast-in-place specimens.With the increase of axial pressure ratio,the anti-overturning moment caused by vertical force increases,and the initial stiffness and bearing capacity of the innovative superimposed slab shear wall increase correspondingly,while the stiffness decay is accelerated and the ductility is reduced.Due to the adverse effect of the gap between the double-sided precast wall panel and the cast-in-place concrete part on the shear resistance,it is suggested that the improvement of bearing capacity of shaft pressure should not be considered in the design.Innovative superimposed slab shear walls specimen with prefabricated panel and cast-in-situ concrete clearance between parts,its integrity weaker than a cast-in-place shear wall specimen,so that damage development process energy consumption relative to the steps,and anti-earthquake ductility is better,but with the increase of axial compression ratio,the innovative superimposed slab shear wall specimen panel and cast-in-situ concrete part clearance squeezed close-grained,damage development lag and focus,energy consumption so that destroyed the corner instantaneous crushing of concrete specimen ductility of variation;The skeleton curve of finite element simulation fits well with the experimental skeleton curve,which verifies the feasibility of the finite element model.Because the finite element model is difficult to consider the bond slip of reinforcement and can not effectively simulate the collapse and fall of concrete,the hysteretic curve obtained by the simulation is relatively full,the initial lateral stiffness and ductility are higher than the test value,and the energy dissipation process is also faster. |
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