木结构榫卯节点抗震性能及其加固试验研究
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摘要
为研究木结构榫卯节点的抗震性能及其加固后性能的变化,进行了6个榫卯节点的拟静力试验,并对试验后的榫卯节点分别采用扒钉、碳纤维、钢销、U型铁箍、角钢、弧形钢板进行加固。对比研究加固前后榫卯节点的破坏形态、滞回曲线、骨架曲线、耗能能力及刚度退化等抗震性能参数。试验结果表明:加固前节点滞回曲线有明显的捏缩现象,木结构良好的抗震性能正是依赖于节点的滑移摩擦耗能;加固后榫卯节点的抗震性能良好,可以达到破坏前的抗震性能;其中弧形钢板加固后的节点初始刚度较大,滞回环饱满,累计耗能为加固前的3倍,承载力提高70%,加固效果明显。根据试验结果给出了基于转角的震损榫卯节点加固设计方法。
In order to investigate the seismic performance and performance change after reinforcement of the mortise-tenon joints,6 mortise-tenon joints are tested by quasi-static load.The specimens,used in the previous tests,are respectively reinforced by cramp,carbon fiber,steel pins,U-flat iron angle bar and curved plate.The seismic performance parameters of specimens before and after reinforcement,such as the failure mode;hysteresis characteristics;skeleton curves and energy dissipation,are compared.The results show that there is significant pinching phenomenon in the hysteresis curves before reinforcement,and the superior seismic performance of wood structures is dependent on the energy dissipation of node's sliding friction;the seismic performance of damaged joints after reinforcement is good,it is consistent with the performance before the damage.The initial stiffness of the joint,which is reinforced by curved steel,increases greately and the hysteresis loops of the joints are full.The reinforcement effect is obvious.The total energy dissipation of joint is 3 times larger than before,and the load capacity increases by 70%.At last,according to the results,the reinforcement methods based on the rotation of damaged joints is given.
In order to investigate the seismic performance and performance change after reinforcement of the mortise-tenon joints,6 mortise-tenon joints are tested by quasi-static load.The specimens,used in the previous tests,are respectively reinforced by cramp,carbon fiber,steel pins,U-flat iron angle bar and curved plate.The seismic performance parameters of specimens before and after reinforcement,such as the failure mode;hysteresis characteristics;skeleton curves and energy dissipation,are compared.The results show that there is significant pinching phenomenon in the hysteresis curves before reinforcement,and the superior seismic performance of wood structures is dependent on the energy dissipation of node's sliding friction;the seismic performance of damaged joints after reinforcement is good,it is consistent with the performance before the damage.The initial stiffness of the joint,which is reinforced by curved steel,increases greately and the hysteresis loops of the joints are full.The reinforcement effect is obvious.The total energy dissipation of joint is 3 times larger than before,and the load capacity increases by 70%.At last,according to the results,the reinforcement methods based on the rotation of damaged joints is given.
引文
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[10]赵鸿铁,董春盈,薛建阳,等.古建筑木结构透榫节点特性试验分析[J].西安建筑科技大学学报:自然科学版,2010,42(3):315-318.ZHAO Hongtie,DONG Chunying,XUE Jianyang,et al.The experimental study on the characteristics of mortise-tenon joint historic timber build-ings[J].Journal of Xi’an Univ.of Arch.&Tech,2010,42(3):315-318.(in Chinese)
[2]谢启芳.中国木结构古建筑加固的试验研究及理论分析[D].西安:西安建筑科技大学,2007.XIE Qifang.Experiment study and theory analysis on strengthing for Chinese ancient timber buildings[D].Xi'an:Xi'an University of Architectureand Technology,2007.(in Chinese)
[3]熊海贝,倪春,吕西林,等.三层轻木—混凝土混合结构足尺模型模拟地震振动台试验研究[J].地震工程与工程振动,2008,28(1):91-98.XIONG Haibei,NI Chun,LU Xilin,et al.Shaking table tests on 3-storey wood-concrete hybrid structure[J].Journal of Earthquakeing Engineerand Engineering Vibration,2008,28(1):91-98.(in Chinese)
[4]赵鸿铁,马辉,薛建阳,等.高台基古建筑木结构动力特性地震反应分析[J].地震工程与工程振动,2011,31(3):115-121.ZHAO Hongtie,MA Hui,XUE Jianyang,et al.Aralysis of dynmic characteristics and seismic responses of the ancient timber building on high-platform base[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(3):115-121.(in Chinese)
[5]Wen-Shao C,Min-Fu H.Full-scale experiment on reinforced Taiwanese traditional timber frames[C]//World Conference on Timber Engi-neering,Italy:2010.
[6]Hockey,Lam,Prion.Truss plate reinforced bolted connections in parallel strand lumber[J].Canadian Journal of Civil Engineering,2000,27:1150-1161.
[7]GB50005-2003木结构设计规范[S].GB 50005-2003 Code for Design of Timber Structure[S].(in Chinese)
[8]JGJ101-96建筑抗震试验方法规程[S].JGJ 101-96 Specificating of Testing Methods for Earthquake Resistant Building[S].(in Chinese)
[9]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 Hongtie,GE Hongpeng.Experimental study on the characteristic of mortise-tenon joint in historical timber buildings[J].Engi-neering Mechanics,2006,23(10):168-173.(in Chinese)
[10]赵鸿铁,董春盈,薛建阳,等.古建筑木结构透榫节点特性试验分析[J].西安建筑科技大学学报:自然科学版,2010,42(3):315-318.ZHAO Hongtie,DONG Chunying,XUE Jianyang,et al.The experimental study on the characteristics of mortise-tenon joint historic timber build-ings[J].Journal of Xi’an Univ.of Arch.&Tech,2010,42(3):315-318.(in Chinese)
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