摘要
为更好地保护古建筑,采取拟静力加载方法,定性研究了CFRP布(Carbon Fibre Reinforced Plastic)加固榫卯节点的抗震效果。以故宫太和殿某开间梁柱框架为原型,制作了1∶8缩尺模型。采取水平低周反复加载方式,首先进行未加固节点抗震性能试验,在此基础上采用CFRP布包裹各榫卯节点,进行加固后节点对比试验。基于试验获得的节点M-θ滞回曲线,对每一个滞回环曲线的承载力、刚度、延性、耗能等力学参数变化进行了详细对比论述,定性评价了CFRP布加固榫卯节点的抗震效果,并进行了量化分析验证。结果表明:榫卯节点加固前具有较好的延性与耗能性能,其主要抗震缺陷包括较低的承载力、较差的转动刚度;与未加固节点相比,CFRP布加固后的榫卯节点可弥补上述不足,且加固后的节点仍具有较好的延性和耗能性能。
In order to effectively protect Chinese ancient buildings,the aseismic behaviors of their tenon-mortise joints strengthened by CFRP(Carbon Fibre Reinforced Plastic)were studied.Part of the timber structure of Tai-he Palace in the Forbidden City was taken as examples,its1*8scale model of timber frame with4beams,4columns and concrete roof were built.Low cyclic reversed loading tests were carried out.The initial timber structure were tested firstly.Then its tenon-mortise joints were wrapped by CFRP,the strengthened structure was tested to get the aseismic effects.The M-6(moment-rotation)hysteretic curves of the tenon-mortise joints were obtained.For each hysteretic loop,qualitative analysis on parameters such as bearing capability,rigidity,ductility,energy dissipation and so on of the tenon-mortise joints were carried out to evaluate strengthening effects of CFRP.The quantitative analysis further verified the effects.Results show that compared to each unstrengthened tenon-mortise joint,the CFRP strengthened joint has better bearing performance as well as rotation rigidity,which still has good ductility and energy dissipation capabilities.
作者
周乾
闫维明
ZHOU Qian;YAN Weiming(School of Culture of History and Tourism, Datong University, Datong, Shanxi 037009, China;Palace Museum,Beijing 100009, China;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China)
出处
《水利与建筑工程学报》
2018年第1期198-206,共9页
Journal of Water Resources and Architectural Engineering
基金
北京市博士后工作经费项目(2013ZZ-04)
故宫博物院科研基金项目(KT2012-7)
关键词
CFRP
榫卯节点
抗震加固
滞回曲线
定性分析
CFRP material
tenon-mortise joint
aseismic strengthening
hysteretic curves
qualitative analysis
