Study On Seismic Behavior And Design Method Of Infilled Wall In Self-centreing Frame Structure

Resiliable functional structure is one of the hotspots in seismic research of building structures,and self-centering frame structure is one of its structural types.The seismic displacement response of self-centering structures is larger than that of traditional structures,so the seismic performance of non-structural components has a very high research value.Based on the seismic mechanism of the self-centering frame structure,this paper proposes the self-centering frame-flexible damping connection infilled wall(SCF-IW)structure form,in order to achieve the purpose of no damage of the filled wall when the displacement Angle between layers is large.This paper mainly studies the following aspects:(1)To comprehensively study the seismic performance of the annular steel plate damper in the direction of tension and compression,nine full-scale specimens were designed and fabricated.Firstly,the mechanical properties of dampers with different geometric parameters and yield strength were investigated by quasi-static tests.Secondly,the calculation formulae of the initial stiffness and elastic ultimate bearing capacity of the damper were derived through the simplified mechanical model.The research results show that the hysteresis curves of the annular steel plate damper in the tensile and compression direction are almost full parallelogram,indicating that it possesses good energy dissipation capacity;the thickness t and the straight length s of the specimen have bigger influence on initial stiffness of the steel plate;after 30 cycles of cyclic loading at the design displacement,the bearing capacity of the specimen degraded slightly,indicating that it has good fatigue resistance.The theoretical calculation results and the finite element simulation results are in good agreement with the experimental results,which proves that the theoretical calculation formula is correct and reasonable,and the hysteretic curves calculated by the model is also in good agreement.(2)In order to study the influence of the packed wall on the self-centering frame under earthquake action,a 1/3 scale single-span double-layer self-centering framepacked wall structure model was designed and made.Through low-cycle reciprocating loading tests,the effects of flexible connection and rigid connection on the seismic performance of the self-centering frame were investigated.The test results show that the arrangement of the packed walls increases the stiffness and energy dissipation capacity of the pure frame structure obviously,but also increases the residual displacement of the structure accordingly.The seismic performance of the rigid connection packed wall is poor,and it is difficult to match the large deformation capacity of the self-centering structure.The flexible connection packed wall structure can achieve less structural damage after the displacement Angle between 1/30 stories,and has better selfcentering performance.(3)Based on the experiment,the framework model was established through ABAQUS and the numerical analysis was carried out.By comparing the skeleton curves of the simulated and experimental frames,the results are in good agreement,which verifies the rationality of the frame.The restoring force model of SCF-IW was deduced,and the finite element model with infilled wall was established.The rationality of the restoring force model was verified through static analysis,which laid a foundation for its engineering application.