古建筑木结构榫卯节点刚度的地震损伤分析和识别  

Seismic damage analysis and identification for the stiffness of ancient timber buildings mortise-tenon joints

作　　者：薛建阳[1] 白福玉[1] 张锡成[1] 隋? 周超锋[1] XUE Jianyang;BAI Fuyu;ZHANG Xicheng;SUI Yan;ZHOU Chaofeng(School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《振动与冲击》2018年第6期47-54,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51678478);陕西省自然科学基础研究基金项目(2016JQ5060);陕西省教育厅科研计划项目(15JK1444)

摘　　要：在缩尺比为1∶3.52的殿堂式古建筑木结构振动台试验基础上,获得了地震作用下榫卯节点初始刚度和屈服刚度损伤规律。根据建立的古建筑木结构简化力学模型,利用静动力凝聚方法确立了结构刚度与榫卯节点刚度之间的关系,推导了结构状态方程和观测方程。结合力锤敲击试验和仿真计算,获得了结构位移、速度和加速度响应。考虑噪信比5%噪声干扰,采用奇异值分解的偏最小二乘法(PLS-SVD)和扩展卡尔曼滤波法(EKF)对结构刚度损伤进行了识别。根据结构刚度识别结果,计算了榫卯节点初始刚度和屈服刚度损伤识别值。结果表明:榫卯节点初始刚度损伤先增大后减小,屈服刚度损伤一直增加;静动力凝聚、偏最小二乘和扩展卡尔曼滤波的混合算法对榫卯节点初始和屈服刚度识别精度较高,适用性较好。Based on the shaking table test of a single-bay ancient timber frame with a scale ratio1∶3.52,the damage rules for the initial stiffness and yield stiffness of mortise-tenon were obtained under cumulative earthquake action.The structural simplified mechanics model was established,the relationship between the stiffness of the structure and the stiffness of the mortise joint was established by means of the static and dynamic cohesion method,and the structural state equation and observation equation were deduced.The responses of displacement,velocity and acceleration were obtained by the force hammer percussion test and simulation calculation.Considering the5%noise disturbance in the laboratory environment,the damage identification was carried out by the least squares method and the extended Kalman filter method.Based on the identification results,the damage values of the initial stiffness and yield stiffness were calculated.The results show that the initial stiffness damage of mortise-tenon joints increases first and then decreases,the yield stiffness damage is straightly increased,and the hybrid algorithm has higher precision for identifying the initial stiffness and yield stiffness.

关 键 词：古建筑木结构 榫卯节点 静动力凝聚 地震损伤 刚度识别 

分 类 号：TU366.2[建筑科学—结构工程]