瓜柱柱脚直榫节点受弯力学模型研究
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摘要
为了研究古木结构中瓜柱柱脚直榫节点的受弯性能,设计了3个不同尺寸的缩尺试件模型.通过单调加载试验,获得了节点的弯矩-转角关系以及最终破坏形态.运用大型有限元分析软件,采用实体单元对节点的受弯性能进行数值模拟.结合试验研究和数值模拟结果,在一定简化假定的基础上建立了节点受弯时的简化力学模型.研究结果表明:瓜柱柱脚直榫节点的主要破坏类型为脱榫破坏;受弯时节点的抵抗力矩主要由柱顶轴压力对转动点来合成;节点的弯矩-转角曲线可以简化为带下降段的双折线模型.
Three straight mortise-tenon joints in the base of melon-column were built to study their flexural behavior.The relationships of moment-rotation and failure modes were obtained through monotonic loading tests.The flexural behavior was simulated with finite element software.On the premise of some basic assumptions,the simplified mechanical model was built on the basis of experiments and numerical simulation.Research results show that the main damage type of joints is pulling out,and the resisting torque is mainly synthesized by the vertical load on the top of columns to rotation point.The moment-rotation curve can be simplified as a double broken line model.
Three straight mortise-tenon joints in the base of melon-column were built to study their flexural behavior.The relationships of moment-rotation and failure modes were obtained through monotonic loading tests.The flexural behavior was simulated with finite element software.On the premise of some basic assumptions,the simplified mechanical model was built on the basis of experiments and numerical simulation.Research results show that the main damage type of joints is pulling out,and the resisting torque is mainly synthesized by the vertical load on the top of columns to rotation point.The moment-rotation curve can be simplified as a double broken line model.
引文
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[2]乐志.中国传统木构架榫卯及侧向稳定研究[D].南京:东南大学土木工程学院,2004:28-33.YUE Zhi.The study of traditional wooden rabbet&traditional structure horizontal stability[D].Nanjing:College of Civil Engineering,Southeast University,2004:28-33.(In Chinese)
[3]姚侃,赵鸿铁,葛鸿鹏.古建木结构榫卯连接特性的试验研究[J].工程力学,2006,23(10):168-173.YAO Kan,ZHAO Hong-tie,GE Hong-peng.Experimental studies on the characteristic of mortise-tenon joint in historic timber buildings[J].Engineering Mechanics,2006,23(10):168-173.(In Chinese)
[4]李琪.古建筑木结构榫卯及木构架力学性能与抗震研究[D].西安:西安建筑科技大学土木工程学院,2008:35-53.LI Qi.Study of rabbets and mechanical properties and seismic performance of timber frame of Chinese historic timber buildings[D].Xi’an:School of Civil Engineering,Xi’an University of Architecture and Technology,2008:35-53.(In Chinese)
[5]王俊鑫.榫卯连接木结构的静力与动力分析研究[D].昆明:昆明理工大学建筑工程学院,2008:25-32.WANG Jun-xin.Static and dynamic analysis of mortise-tenon connection timber structure[D].Kunming:Faculty of Civil and Architectural Engineering,Kunming University of Science&Technology,2008:25-32.(In Chinese)
[6]徐明刚.中国古建筑木结构榫卯节点抗震性能研究[D].南京:东南大学土木工程学院,2011:76-89.XU Ming-gang.Study of aseismatic behavior of mortise-tenon joints in Chinese ancient timber buildings[D].Nanjing:College of Civil Engineering,Southeast University,2011:76-89.(In Chinese)
[7]CHANG W S,HSU M F,CHEN C J.Estimating rotational stiffness of timber joints by using fractional factorial experiments combined with computer simulation[C]//Proceedings of the 8th World Conference on Timber Engineering.Lahti:WCTE,2004:101-106.
[8]SHANKS J,WALKER P.Testing of traditional connections in Green oak carpentry[C]//Proceedings of the 8th World Conference on Timber Engineering.Lahti:WCTE,2004:183-186.
[9]HAN S R,LEE J J.Mechanical performance of Korean traditional wooden building of the column-girder tenon-joint by joint type[C]//Proceedings of the 9th World Conference on Timber Engineering.Portland:WCTE,2006:23.
[10]王天.古代大木作静力初探[M].北京:文物出版社,1992:159-178.WANG Tian.Static analysis on ancient timber structures[M].Beijing:Cultural Relics Publishing House,1992:159-178.(In Chinese)
[11]孟庆军.木质材料间摩擦性能及其对木结构设计的影响研究[D].哈尔滨:东北林业大学,2010:85.MENG Qing-jun.The study for frictional properties of wooden materials and the impact on wood structure design[D].Harbin:Northeast Forestry University,2010:85.(In Chinese)
[12]陈志勇.应县木塔典型节点及结构受力性能研究[D].哈尔滨:哈尔滨工业大学土木工程学院,2011:193-195.CHEN Zhi-yong.Behaviour of typical joints and the structure of Yingxian wood pagoda[D].Harbin:School of Civil Engineering,Harbin Institute of Technology,2011:193-195.(In Chinese)
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