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
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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.
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.
引文
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[13]OGAWA K,SASAKI Y,YAMASAKI M.Theoretical estimation of the mechanical performance of traditional mortise-tenon joint involving agap[J].Journal of Wood Science,2016,62(3):242-250.
[14]张风亮,赵鸿铁,薛建阳,等.基于摇摆柱原理的古建筑木结构柱架抗侧分析及试验验证[J].工业建筑,2013,43(10):55-60.ZHANG Fengliang,ZHAO Hongtie,XUE Jianyang,et al.Lateral load resisting analysis and experimental verification of ancient timber column-frame based on swing-columns principle[J].Industrial Construction,2013,43(10):55-60.
[15]夏海伦.不同松动程度下古建筑不对称榫卯节点抗震性能试验研究[D].西安:西安建筑科技大学,2015.XIA Hailun.Experimental study on seismic behavior of through-tenon joints under different degree of looseness in ancient wooden buildings[D].Xi′an:Xi′an Univ.of Arch.&Tech.,2015.
[2]周乾,闫维明,周锡元,等.古建筑榫卯节点抗震性能试验[J].振动,测试与诊断,2011,31(6):679-684,808.ZHOU Qian,YAN Weiming,ZHOU Xiyuan,et al.Aseismic behavior of Chinese ancient tenon-mortise joint[J].Journal of Vibration,Measurement&Diagnosis,2011,31(6):679-684,808.
[3]谢启芳,郑培君,向伟,等.残损古建筑木结构单向直榫榫卯节点抗震性能试验研究[J].建筑结构学报,2014,35(11):143-150.XIE Qifang,ZHENG Peijun,XIANG Wei,et al.Experimental study on seismic behavior of damaged straight mortise-tenon joints of ancient timber buildings[J].Journal of Building Structures,2014,35(11):143-150.
[4]商博渊.台湾传统木构造「减榫」力学行为与模拟生物劣化之研究[D].台湾:国立成功大学,2010.SHANG Boyuan.Mechanical performance of Taiwanese traditional“right-angled-notch-tenon”timber connections by reviewing the effects of simulated termite infestation[D].Taiwan:National Cheng Kung University,2010.
[5]薛建阳,路鹏,夏海伦.古建筑木结构透榫节点受力性能的影响因素分析[J].西安建筑科技大学学报(自然科学版),2018,50(3):324-330.XUE Jianyang,LU Peng,XIA Hailun.Influencing factors analysis on mechanical behavior of through-tenon joints in ancient timber buildings[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2018,50(3):324-330.
[6]薛建阳,夏海伦,李义柱,等.不同松动程度下古建筑透榫节点抗震性能试验研究[J].西安建筑科技大学学报(自然科学版),2017,49(4),463-469.XUE Jianyang,XIA Hailun,LI Yizhu,et al.Experimental study on seismic behavior of penetrated mortisetenon joints under different degree of looseness in ancient buildings[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2017,49(4),463-469.
[7]阎嘉义,金文森.中国传统木构造榫卯系统之结构行为[J].中国土木水利学刊(台湾),1995,7(2):151-161.YAN Jiayi,JIN Wensen.The structural behavior of mortise-tenon joints in ancient Chinese wooden buildings[J].Journal of civil and hydraulic engineering,1995,7(2):151-161.
[8] CHANG W S.Research on rotational performance of traditional Chuan-Dou timber joints in Taiwan[D].Taiwan:Chen Kung University,2006.
[9]陈志勇.应县木塔典型节点及结构受力性能研究[D].哈尔滨:哈尔滨工业大学,2011.CHEN Zhiyong.Behavior of typical joints and the structure of Ying-Xian wood pagoda[D].Harbin:Harbin Institute of Technology,2011.
[10]谢启芳,崔雅珍,赵鸿铁,等.古建筑木结构修缮加固时木材材料强度取值探讨[J].福州大学学报(自然科学版),2013,41(4):483-486.XIE Qifang,CUI Yazhen,ZHAO Hongtie,et al.Study on calculation method of wood strength for ancient timber structure buildings[J].Journal of Fuzhou University(Natural Science Edition),2013,41(4):483-486.
[11]Forest Products Laboratory.Wood handbook:wood as an engineering material[M].Washington DC:University Press of the Pacific,2010.
[12]张锡成.地震作用下木结构古建筑的动力分析[D].西安:西安建筑科技大学,2013.ZHANG Xicheng.Dynamic analysis of ancient timberframe buildings under seismic excitations[D].Xi′an:Xi′an Univ.of Arch.&Tech.,2013.
[13]OGAWA K,SASAKI Y,YAMASAKI M.Theoretical estimation of the mechanical performance of traditional mortise-tenon joint involving agap[J].Journal of Wood Science,2016,62(3):242-250.
[14]张风亮,赵鸿铁,薛建阳,等.基于摇摆柱原理的古建筑木结构柱架抗侧分析及试验验证[J].工业建筑,2013,43(10):55-60.ZHANG Fengliang,ZHAO Hongtie,XUE Jianyang,et al.Lateral load resisting analysis and experimental verification of ancient timber column-frame based on swing-columns principle[J].Industrial Construction,2013,43(10):55-60.
[15]夏海伦.不同松动程度下古建筑不对称榫卯节点抗震性能试验研究[D].西安:西安建筑科技大学,2015.XIA Hailun.Experimental study on seismic behavior of through-tenon joints under different degree of looseness in ancient wooden buildings[D].Xi′an:Xi′an Univ.of Arch.&Tech.,2015.