考虑变形损伤的足尺燕尾榫节点抗震性能试验及恢复力模型研究  

Seismic performance test and resilience model of full size dovetail joint considering deformation damage

作　　者：白福玉 范则楷[2] 薛建阳 胡成明[2] 吴晨伟 李加旭 BAI Fuyu;FAN Zekai;XUE Jianyang;HU Chengming;WU Chenwei;LI Jiaxu(School of Science,Xi’an University of Architecture&Technology,Xi’an 710055,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学理学院,陕西西安710055 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2024年第8期168-179,共12页Journal of Building Structures

基　　金：国家自然科学基金青年科学基金项目(51908454)。

摘　　要：为研究变形损伤对燕尾榫节点抗震性能的影响,制作了3组削减榫长0%、15%及30%的足尺落叶松燕尾榫节点,对其进行拟静力和声发射试验,得到各节点的滞回曲线,骨架曲线及拔榫量。根据测得的声发射参数,分析节点各阶段的变形损伤模式,建立损伤演化方程,并研究变形损伤对节点恢复力模型的影响。结果表明:随着转角的增大,节点弯矩先增大后减小,承载能力降低,拔榫量增大,节点的刚度逐渐减小。节点变形损伤根据滞回曲线特征可分为轻微、中等及严重损伤阶段,节点在轻微损伤阶段以拉伸损伤为主,进入中等损伤阶段和严重损伤阶段,剪切损伤增加明显,各节点损伤值随相对应力比的增大而增大。轻微与中等损伤阶段节点恢复力模型为弹性-屈服模型,严重损伤阶段节点恢复力模型为滑移-恢复模型。削减榫长0%、15%和30%的节点屈服刚度分别为弹性刚度的52.76%、35.36%和69.79%,恢复刚度分别为弹性刚度的41.42%、62.14%、34.58%。随着松动程度的增加,节点转角延性系数增大,剪切损伤较早出现,相同损伤下节点刚度减小明显。In order to study the effect of internal deformation damage on the seismic performance of dovetail joint,three groups of full-size larch dovetail joints,with 0%,15%and 30%tenon reduction,were fabricated.Vertical quasi-static test and acoustic emission test were carried out to analyze the hysteresis and skeleton curves of each joint and the pulled out amount of each joint.According to the measured AE parameters,the deformation damage mode and damage evolution equation of each stage of the joints were analyzed.And the influence of deformation damage on the restoring model of joints was also studied.The results show that with the increase of the rotation,the bending moment of the joint first increases and then decreases,the bearing capacity decreases,the amount of tenon pulling increases and the stiffness of the joint gradually decreases.The loading process can be divided into slight damage stage,medium damage stage and severe damage stage according to the hysteretic curve characteristics.At the stage of slight damage,tensile damage dominates,and when entering the stage of moderate damage and severe damage,shear damage of specimens increased obviously,and the damage level of each joint increases with the increase of the relative stress ratio.The restoring model of the joint in mild and moderate damage stages is elastic-yield model.The restoring model of the joint in severe damage stage is slip-restoring model.The yield stiffness of the joints with different weakening degrees is 52.76%,35.36%and 69.79%of the elastic stiffness,and the recovery stiffness is 41.42%,62.14%and 34.58%of the elastic stiffness,respectively.With the increase of the degree of loosening,the angle ductility coefficient increases,the shear 168 damage appears earlier,and the joint stiffness decreases obviously under the same damage level.

关 键 词：古建筑木结构 足尺燕尾榫节点 拟静力试验 滞回性能 恢复力模型 变形损伤 

分 类 号：TU366.2[建筑科学—结构工程] TU317.1