不同松动程度下古建筑木结构透榫节点弯矩-转角关系分析  

Moment-rotation relationship of through-tenon joints under different degree of looseness in ancient wooden buildings

作　　者：薛建阳[1] 董金爽 夏海伦 张锡成[1] XUE Jianyang;DONG Jinshuang;XIA Hailun;ZHANG Xicheng(School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2018年第5期638-644,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51678478;51508454);国家"十二五"科技支撑计划项目(2013BAK01B03-02);陕西省科学技术研究发展计划项目(2013KW23-01)

摘　　要：对古建筑木结构透榫节点的受力机理进行分析,推导了不同松动程度下透榫节点弯矩-转角理论计算公式.为验证理论计算公式的合理性,以6个缩尺比为1/3.2的透榫节点模型试验为对象,其中包括1个连接完好紧密无松动透榫节点和5个连接不紧密有不同松动程度的透榫节点,获得了不同松动程度下透榫节点的弯矩-转角骨架曲线,将理论计算结果与试验结果进行对比分析,两者吻合较好.分析结果表明:随着摩擦系数的增大,透榫节点的转动弯矩和初始转动刚度逐渐增大;增大透榫截面高度,可有效提高透榫节点承载能力;榫头埋置嵌入长度随着木材摩擦系数、榫头插入卯口长度的增大而增加,随着榫头截面高度的增加而减小;随着节点松动程度的增大,透榫节点承载能力逐渐降低.The mechanical mechanism of through-tenon joints was analyzed,and the moment-rotation calculation formula under different degree of looseness was deduced.In order to validate the formula,six 1/3.2-scaled through-tenon joints were designed for low cyclic reversed loading test,including a closely joint without loose connection intact and 5 joints with different degree of looseness.The moment-rotation skeleton curves of the test mortise and tenon joints were obtained and compared with the theoretical ones,to show that the calculated results agree well with the test results.It also indicated that the rotational moment and initial rotational stiffness increase with the increase of friction coefficients.With the increment of the height of mortise and tenon joints,the load capacity is improved.The embedment length will increase with the increment of wood friction coefficient and insertion length of tenon in mortise,whereas it decreases with the increasing of section depth.The loading capacity of through-tenon joints will be reduced with the increase of looseness.

关 键 词：古建筑 木结构 松动程度 透榫节点 弯矩-转角关系 

分 类 号：TU366.2[建筑科学—结构工程]