柱脚环形腐朽的含墙木框架抗震性能试验研究OA

To investigate the influence of circumferential column foot damage on the seismic performance of timber frames with brick infill walls,two specimens are designed and fabricated:one with intact column foot joints and one with circumferentially damaged column foot joints.Quasi-static tests are conducted on these speci-mens to compare and analyze their seismic performance indicators,including failure modes,hysteretic curves,skeleton curves,strength degradation,and stiffness degradation.The experimental results indicate that both speci-mens exhibit shear failure in the infill walls;however,the damage is significantly more severe in the specimen with damaged column foot joints.The hysteretic curves for both specimens display an inverted"Z"shape,charac-teristic of pronounced pinching effects.Notably,the pinching segment is more pronounced in the specimen with circumferentially damaged joints.The circumferential damage at the column foot compromise the lateral load-bearing capacity and lateral stiffness of the timber frame with infill walls.Compared to the specimen with intact column foot joints,these critical parameters are reduced by 6.56%and 26.26%,respectively,underscoring the detrimental effect of such damage on the structural integrity.To complement the experimental study,numerical simulations of the lateral performance of both specimens are performed using the ABAQUS finite element soft-ware.The numerical results are in good agreement with the experimental data,thereby validating the accuracy and effectiveness of the finite element model in capturing the complex behavior of these structures.Based on this validated model,a comprehensive parametric study is conducted to further analyze the influence of the depth and height of the circumferential column foot damage on the lateral load-bearing capacity of the structure.The results reveal a continuous degradation trend in the lateral load-bearing capacity with increases in both the depth and height of the circumferential damage at the column foot.This degradation is found to be non-linear,with the rate of deterioration accelerating as the damage dimensions increased.The findings of this research provide a valu-able scientific reference for the preservation and reinforcement of ancient timber structures.By quantifying the relationship between specific column foot damage characteristics and the reduction in seismic performance,criti-cal data are offered in this study for developing targeted conservation strategies.