闽浙编木拱桥燕尾榫节点力学模型  

Mechanical model of dovetail joints of Min-Zhe woven timber arch bridges

作　　者：杨艳[1,2] 郑裔 黄聪燕 韦建刚 吴庆雄[1] 陈宝春 YANG Yan;ZHENG Yi;HUANG Cong-yan;WEI Jian-gang;WU Qing-xiong;CHEN Bao-chun(College of Civil Engineering,Fuzhou University,Fuzhou 350108,Fujian,China;Zhicheng College,Fuzhou University,Fuzhou 350002,Fujian,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,Fujian,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福州大学至诚学院,福建福州350002 [3]福建理工大学土木工程学院,福建福州350118

出　　处：《交通运输工程学报》2024年第5期113-130,共18页Journal of Traffic and Transportation Engineering

基　　金：国家自然科学基金项目(51408129,52278158);福建省科技计划项目(2022H6009);福州大学科研启动基金项目(XRC-23047)。

摘　　要：开展了闽浙编木拱桥燕尾榫节点足尺模型拟静力试验,分析了闽浙编木拱桥与古建筑木结构中燕尾榫节点受力机理的异同,探讨了燕尾榫节点受力模型应用于闽浙编木拱桥燕尾榫节点的适用性;根据力学平衡和变形协调条件,建立了考虑节点拔榫量与榫卯口缝隙的闽浙编木拱桥燕尾榫节点弯矩转角力学模型与计算公式,并通过试验数据和有限元分析验证了闽浙编木拱桥燕尾榫节点力学模型和节点刚度,揭示了转角位移和加载行程对拔榫量的影响和榫卯口缝隙与两端轴力对燕尾榫节点刚度的影响。研究结果表明:弹性阶段闽浙编木拱桥燕尾榫节点滞回耗能能力随两端轴力增加而增大,转角大于0.04 rad时构件进入屈服阶段,挤压变形不能恢复,转角达到0.06 rad时滞回曲线斜率停止增长,加载结束后燕尾榫节点未破坏;由于闽浙编木拱桥与古建筑木结构中燕尾榫节点受力机理不同,古建筑木结构中的燕尾榫节点受力模型不适用于闽浙编木拱桥燕尾榫节点,有限元计算所得闽浙编木拱桥燕尾榫节点弯矩转角与试验结果的误差仅为3.2%,弹性正、负最大弯矩与试验值的误差分别为16.7%与-5.2%,说明建立的弯矩转角力学模型可精准反映出节点在转动过程中的弯矩转角变化规律;拔榫量在弹性阶段主要受转角影响,弹塑性阶段则主要受加载控制位移和加载级数影响;榫卯口缝隙从0.06 mm减小至0.01 mm时,节点刚度从29.46 kN·m·rad^(-1)增加至52.24 kN·m·rad^(-1),反映了燕尾榫节点刚度随榫卯口缝隙的减小而增大的趋势。综上所述,提出的力学模型可为现存闽浙编木拱桥保护、修缮和全桥结构抗震性能研究提供参考。The pseudo-static tests on full-scale models of dovetail joints of Min-Zhe woven timber arch bridges were conducted,the similarities and differences in the force mechanisms of dovetail joints between Min-Zhe woven timber arch bridges and ancient timber buildings were analyzed,and the applicability of the dovetail joint mechanical model in dovetail joints of Min-Zhe woven timber arch bridges was explored.According to the mechanical equilibrium and deformation coordination,the bending moment-rotation mechanical model and calculation formulas of dovetail joints of Min-Zhe woven timber arch bridges were proposed considering the tenon pull-out distance and mortise gap of joints.Through the test data and finite element analysis,the mechanical model and stiffness of dovetail joints of Min-Zhe woven timber arch bridges were verified.The effect of rotation and loading trips on the tenon pull-out distance and that of the mortise gap and axial force on the stiffness of dovetail joints were revealed.Research results show that the hysteresis energy dissipation of the dovetail joints of Min-Zhe woven timber arch bridges increases with the increase in the axial force in elastic stage.When the rotation is greater than 0.04 rad,the component enters the yield phase,and extrusion deformation cannot recover.When the rotation reaches 0.06 rad,the slope of the hysteresis curve stops growing.The dovetail joints are not damaged after loading.Due to the different force mechanisms of dovetail joints between Min-Zhe woven timber arch bridges and ancient timber buildings,the dovetail joint mechanical model of ancient timber buildings is not suitable for dovetail joints of Min-Zhe woven timber arch bridges.The error of bending moment-rotation of dovetail joints of Min-Zhe woven timber arch bridges between the finite element value and test value is only 3.2%,and the errors of positive and negative elastic maximum bending moments between finite element values and test values are 16.7% and -5.2%,respectively,indicating that the established bend

关 键 词：桥梁工程 闽浙编木拱桥 力学性能 燕尾榫节点 受力机理 弯矩转角力学模型 节点刚度 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]