| Shear wall is a significant lateral force resisting component in frame core tube structure and high-rise building,at the same time,shear wall has significant impacts on the seismic performance of the structure.In recent years,double steel plate composite shear wall has been gradually applied to high-rise residential system.Composite shear wall can ensure higher strength,stiffness and seismic performance,the double steel plate composite shear wall is lighter in weight and thinner in thickness than the traditional concrete shear wall at the same time,.In the construction of composite shear wall,the steel cavity composed of wall steel plate can become the template of concrete pouring,so as to realize the assembly construction of the wall.The production process greatly shortens the production time and economic cost of the specimen,which is conducive to the modularization and economy of construction.On the basis of ensuring the seismic performance of the wall,reducing the difficulty of specimen making and the cost of test time,this paper innovatively puts forward the L-shaped tie double steel plate composite shear wall.In the processing,the L-shaped connectors were closed tightly by the opposite pull and reverse buckle,so as to achieve the purpose of restraining the steel plates on both sides of the wall body.Based on the low cyclic loading test of six double skin composite shear walls with L-shaped connectors under horizontal load,the stress mechanism and seismic performance of the walls are fully analyzed.The research content includes the following aspects:(1)The welding distance between L-shaped connectors and steel faceplate,the arrangement of L-shaped connectors weld on steel faceplate,and the thickness of wall steel plate were taken as test variables.Through the quasi-static test,the test phenomenon and the ultimate failure mode of each part of the specimen are analyzed.Based on the load displacement data of the loading point of the specimen,the hysteretic curve,skeleton curve and stiffness degradation of the specimen are made,and the influence of different test variables on the above indexes is analyzed.At the same time,the energy dissipation capacity of the specimen is comprehensively analyzed.Through the analysis of the strain gauges pasted on each part of the wall,the change rule of strain at different positions and the change of strain with the whole loading process are studied.(2)Based on the experimental analysis of the specimens,the calculation theory of the specimens is studied,including the calculation of the critical buckling stress of the bottom wall steel panel and the calculation of the ultimate bending capacity of the wall.Through the study of calculation theory,the stress mechanism and critical stress of each part of the wall are further clarified,and the influence of different test variables on the mechanical performance of the wall is compared.(3)Based on the above two parts,the finite element simulation of composite shear wall specimens is carried out.Through finite element software ABAQUS,the solid element model of specimens were built.The welding and contact conditions of the actual specimens are considered in the modeling.Through the simulation of the finite element software,the simulated stress and deformation of each part of the specimen are observed,and the stress is compared with the actual test results to verify the correctness of the model. |
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