| Composite shear wall as a vertical member of structural earthquake resistance,its research and application have been paid more and more attention by the civil engineering industry in recent years.Different scholars have proposed different strengthening members,such as restrained tie bars,stiffeners,multi-cavity and so on.Among them,the restrained tie bar is very popular because of its convenient construction.The seismic performance and deformation performance limit of steel plate concrete composite shear wall with restrained tie bar are discussed in this paper,including:(1)Reviewing the test results of 11 composite shear walls with restrained tension bars in two batches of standard experiments,a new finite element model is established by using ABAQUS finite element platform.In the model,steel plate,tension bar and concrete are all modeled by C3D8 R solid model,taking into account the residual stress of steel plate welding,initial defects of steel plate and compression damage index coefficient / c.The numerical simulation results are compared with the hysteretic curves,skeleton curves and failure patterns of the two batches of standard test results to verify the rationality of the numerical simulation proposed in this paper.In addition,the seismic working mechanism of the steel plate concrete composite shear wall with restrained tension bar is studied,and the stress characteristics of the composite wall under cyclic load and the tension bar with different distance to thickness ratio are studied and analyzed.the full stress process of the composite wall from yield to failure is revealed,and it is pointed out that under reciprocating load,the stress in the middle of the tension rod of the wall is larger,the stress at the root of the tension rod of the end column is larger,and the stress in the middle of the tension rod of the end column is larger.Smaller distance-to-thickness ratio and plum blossom arrangement tension bars can improve the seismic performance of composite walls.(2)The finite element simulation analysis of the specimens in two batches of standard tests is carried out by using the OPENSEES platform based on macroscopic elements,and the advantages and disadvantages of ABAQUS microscopic finite element platform and OPENSEES macroscopic finite element platform are observed,and the efficiency of OPENSEES in structural analysis is verified.(3)Based on the parameter analysis of ABAQUS platform,the effects of six parameters,such as axial compression ratio,wall distance-thickness ratio,wall diameter-to-distance ratio,section steel ratio,end-column distance-to-thickness ratio and end-column diameter-to-thickness ratio,on the seismic performance of steel plate-concrete composite shear walls with restrained bars are analyzed.Through 52 variable parameter models,the quantitative laws of bearing capacity,ductility,lateral stiffness and energy dissipation capacity of composite wall specimens are analyzed,and the reasonable suggestion range of each parameter in the engineering application of steel plate concrete composite shear wall with restrained tension bar is put forward.(4)The limit value of deformation performance index of steel plate-concrete composite shear wall with restrained tension bar is linearly regressed.Based on the division method of skeleton curve,five performance points of composite wall specimens are divided,and the displacement angle is selected as the performance limit index.According to the results of 52 numerical simulation models with variable parameters,the axial compression ratio and wall are analyzed.The influence of parameters such as body distance thickness ratio,wall diameter distance ratio,section steel ratio,end column distance thickness ratio and end column diameter distance ratio on the limit value of performance index,the formula for calculating the limit value of displacement angle of deformation performance index is put forward,and the calculated value is compared with the simulated value,which provides a reference basis for engineering design. |
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