摘要
为了掌握古建筑木结构地震作用下的破坏过程及对应的破坏状态,对震后古建筑木结构的破坏程度做出合理的评估,基于燕尾榫柱架和枓栱铺作层低周反复荷载作用下的滞回特性和能量耗散原理,将燕尾榫柱架和枓栱铺作层作为两个耗能构件,计算其在低周反复荷载作用下的"抵抗破坏潜能";根据古建筑木结构振动台试验,计算各工况地震作用下每一耗能构件所耗散的能量;基于构件的"抵抗破坏潜能"和各工况下的地震耗能情况建立耗能构件在不同地震作用下的地震破坏评估模型,并借助能量分配系数找到各耗能构件破坏状态与整体结构破坏状态之间的关系,从而建立整体结构在不同地震作用下的破坏评估模型;应用该地震破坏评估模型,分别对燕尾榫柱架和枓栱铺作层和整体结构进行构件地震破坏评估及整体结构地震破坏评估,所得到的破坏系数能较好地反映各构件以及整体结构在不同地震作用下的破坏状态,研究结果可为古建筑木结构的抗震加固提供可靠的理论依据。
In order to investigate the failure process and corresponding failure mode of the ancient timber structure so as to be able to make a reasonable evaluation of the damage degree of the ancient timber structure after earthquakes,the ’potential of destruction-resistance’ of the two energy-consuming components under low cycle reversed loading was calculated based on the hysteretic behavior and energy dissipation principle of the dovetail column-frame and arches brackets under low reversed cyclic loading.The dissipated energy of each energy-consuming component under various earthquake conditions was calculated based on the results of shaking table tests of ancient timber structure.The model for the seismic damage evaluation of the two energy-consuming components was established on the basis of the ’potential of destruction-resistance’ and the dissipated energy.The relationship of the failure state between energy-consuming components and overall structure was found by means of the energy distribution coefficient.The model for seismic damage evaluation of the overall structure under various earthquake conditions was also developed.With the derived model for seismic damage evaluation,the energy-consuming components and the overall structure can be evaluated respectively.The resulting failure coefficient can better reflect the failure state of each component and the overall structure under various earthquake conditions.The research results can provide a reliable theoretical basis for the seismic reinforcement for the ancient timber structures.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第8期127-134,共8页
Journal of Building Structures
基金
国家自然科学基金项目(59878043
51108373)
国家文物局文物保护科学和技术研究课题(20110123)
陕西省重点学科建设专项资金(E01001)
陕西省自然科学基础研究计划项目(98C09)
长江学者和创新团队发展计划资助项目
关键词
古建筑木结构
抵抗破坏潜能
能量耗散
地震破坏评估
破坏系数
ancient timber structure
potential of destruction-resistance
energy dissipation
seismic damage evaluation
failure coefficient
