| The hollow frame truss wall is composed of external frame and internal truss members.By changing the structural parameters of the wall,the lateral stiffness of the wall can be flexibly adjusted,and the disadvantages of the traditional shear wall stiffness can not be easily adjusted can be overcome.In order to study the seismic performance of the wall,three specimens of reinforced co’ncrete hollow frame truss wall are designed and manufactured in this paper.The parameters such as axial compression ratio,reinforcement ratio,height-width ratio and number of trusses are changed.Low-cycle repeated loading tests are carried out.The numerical calculation of hollow frame truss wall is carried out by using finite element software ABAQUS,The failure mode,bearing capacity and ductility of the wall are studied.The details are as fo llows:1.The low-cycle cyclic loading tests of three reinforced concrete hollow frame truss wall members with a model ratio of 1:2 were carried out.Through the analysis of failure phenomena,bearing capacity,hysteretic performance,skeleton curve,energy dissipation capacity and stiffness degradation law,the failure mode,failure law,weakne.ss and energy dissipation characteristics of hollow frame truss wall were studied.2.Using f,inite element software ABAQUS,a precise model of non-linear finite element analysis of hollow frame truss wall is established.On the basis of verifying the reliability of the model,the effects of concrete strength grade,axial compression ratio,reinforcement ratio of wall limbs and stirrup ratio of wall on ultimate bearing capacity and deformation capacity of hollow frame truss wall are studied by changing design parameters,and the experimental conclusions are extended.3.On the basis of the load-displacement curves obtained from the tests,the skeleton curves obtained from the tests are modeled by the typical four-fold model,and the formulas for calculating the key points of the skeleton curves are given.The restoring force model of the hollow frame-truss wall considering stiffness degradation is established.The research results can provide reference for the elastic-plastic time history analysis of the structure. |
