古建筑木结构基于结构潜能和能量耗散准则的地震破坏评估
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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.
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.
引文
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[2]Park Y J,Ang A H S.Mechanistic seismic damagemodel for reinforced concrete[J].Journal of StructuralEngineering,1985,111(4):722-739.
[3]欧进萍,牛荻涛,王光远.多层非线性抗震钢结构的模糊动力可靠性分析与设计[J].地震工程与工程振动,1990,10(4):27-37.(OU Jinping,NIU Ditao,WANG Guangyuan.Fuzzy dynamical reliability analysisand design of muti-storey nonlinear aseismic steelstructures[J].Earthquake Engineering and EngineeringVibration,1990,10(4):27-37.(in Chinese))
[4]江近仁,孙景江.砖结构的地震破坏模型[J].地震工程与工程振动,1987,7(1):20-34.(JIANG Jinren,SUN Jingjiang.Seismic damage model of brick structure[J].Earthquake Engineering and EngineeringVibration,1987,7(1):20-34.(in Chinese))
[5]GB50165—1992古建筑木结构维护与加固技术规范[S].中国建筑工业出版社,1992.
[6]李铁英,魏剑伟,张善元,等.木结构双参数地震损坏准则及应县木塔地震反应评价[J].建筑结构学报,2004,25(2):91-98.(LI Tieying,WEI Jianwei,ZHANG Shanyuan,et al.Double-parameters seismicdamage criterion on wooden structure and seismicreaction appraisement of Ying-xian wooden tower[J].Journal of Building Structures,2004,25(2):91-98.(in Chinese))
[7]隋.中国古代木构耗能减震机理与动力特性分析[D].西安:西安建筑科技大学,2009.(SUI Yan.Analysis on energy dissipation mechanism and dynamiccharacteristic for Chinese ancient timber buildings[D].Xi’an:Xi’an University of Architecture&Technology,2009.(in Chinese))
[8]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.(JGJ101—1996Specification of testing methods for earthquake resistantbuilding[S].Beijing:China Architecture&BuildingPress,1997.(in Chinese))
[9]邱法维,钱稼茹,陈志鹏.结构抗震试验方法[M].北京:科学出版社,2000:60-61.
[10]姚侃.木结构古建筑的结构特性及抗震性能研究[D].西安:西安建筑科技大学,2006:127-139.(YAO Kan.Study on the structural properties andseismic performance of Chinese historical timberbuildings[D].Xi’an:Xi’an University of Architecture&Technology,2006:127-139.(in Chinese))
[11]张鹏程.中国古代木构建筑结构及其抗震发展研究[D].西安:西安建筑科技大学,2003:98-119.(ZHANG Pengcheng.Study on structure and its seismicbehavior development of Chinese ancient timberstructure buildings[D].Xi’an:Xi’an University ofArchitecture&Technology,2003:98-119.(inChinese))
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