应县木塔实体结构的动态特性试验与分析
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摘要
为了对应县木塔结构动态特性有准确的把握和为研究与维修保护提供依据,对其实体进行现场环境振动测试试验,得到了木塔两个方向的前四阶水平振动模态和位移频域传递函数。根据实测分析结果、振型正交性和已知的结构各层质量,反演推算出了木塔结构层间刚度,发现相邻两层刚度差别较大,这将导致变形集中,此与木塔现状残损、变形状态相一致。利用传递函数技术计算分析了不同地震波作用下的木塔各层的弹性位移反应,建立了适合这类结构动态反应的弹性分析方法。
In order to provide the dynamic characteristics of Yingxian Wooden Tower for preservation and repair, on-site measurements were conducted. Frequency domain transfer function and the first four vibration modes of the tower in two mutually perpendicular horizontal directions are obtained. With the vibration shape orthogonality, the layer rigidity of the tower is deduced and the great rigidity difference of adjacent two floors is discovered. This indicates that the relative horizontal displacement under earthquake will concentrate on the less rigid layer. This observation is consistent with the current deformation state of the tower. Using transfer function technique, the elastic displacement response of each layer of the tower under different seismic waves is analyzed, and an elastic analysis method of the structure is established.
In order to provide the dynamic characteristics of Yingxian Wooden Tower for preservation and repair, on-site measurements were conducted. Frequency domain transfer function and the first four vibration modes of the tower in two mutually perpendicular horizontal directions are obtained. With the vibration shape orthogonality, the layer rigidity of the tower is deduced and the great rigidity difference of adjacent two floors is discovered. This indicates that the relative horizontal displacement under earthquake will concentrate on the less rigid layer. This observation is consistent with the current deformation state of the tower. Using transfer function technique, the elastic displacement response of each layer of the tower under different seismic waves is analyzed, and an elastic analysis method of the structure is established.
引文
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[3]李世温,陈正廷,等.应县木塔荷载研究[R].太原理工大学,2000.LiShiweng,ChengZhenting.Load distribution onYingxian wooden tower[R].TaiyuanUniversity ofTechnology,2000.(inChinese)
[4]太原工学院,山西省文物局.应县木塔木材取样试验报告[R].太原工学院,1979.Taiyuan engineering college,Shanxi department of cultural relic.Timber sampling test report ofYingxian wooden tower[R].TaiyuanEngineeringCollege,1979.(inChinese)
[5]Liang,Ssu-Cheng(edited byWilmaFairbank).A PictorialHistory ofChineseArchitecture[M].MIT Press,Boston,1984.
[6]马炳坚.中国古建筑木作营造技术[M].北京:科学出版社,1991.MaBingjian.The construction technology ofChinese ancient wooden buildings[M].Beijing:ScientificPress,1991.(inChinese)
[7]王天.古代大木作静力初探[M].北京:文物出版社,1992.WangTian.The preliminary statical study of ancient wooden structures[M].Beijing:CulturalRelicPress,1992.(inChinese)
[8]方东平,俞茂宏,等.木结构古建筑结构特性实验研究[J].工程力学,2000,17(2):75-83.FangDongping,YuMaohong.Experimental studies of structural characteristics of ancient timber architectures[J].EngineeringMechanics,2000,17(2):75-83(inChinese)
[9]方东平,俞茂宏,等.木结构古建筑结构特性计算研究[J].工程力学,2001,18(1):137-145.FangDongping,YuMaohong.Numerical analysis of structural characteristics of ancient timber architecture[J].EngineeringMechanics,2001,18(1):137-145.(inChinese)
[10]赵均海,等.中国古代木结构有限元动力分析[J].土木工程学报,2000,33(1):32-35.ZhaoJonghai,YuMaohong.Dynamic finite element analysis of the ancient superstructure of the east city gate ofXIAN [J].ChinaCivilEngineeringJournal,2000,33(1):32-35.(inChinese)
[11]陈志鹏,等.香港几幢高层建筑的脉动试验[M].北京:清华大学出版社,1985.ChengZhipeng.The pulsation experiment of several high-rise buildings inHongKong[M].Beijing:TsinghuaUniversityPress,1985.(inChinese)
[12]陈亚勇.MATLAB信号处理详解[M].北京:人民邮电出版社,2001.ChengYayong.MATLAB signal handling detail[M].Beijing:ThePeople抯Post andCommunicationsPress,2001.(inChinese)
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