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.
出处
《工程力学》
EI
CSCD
北大核心
2005年第1期141-146,共6页
Engineering Mechanics
基金
国家青年自然科学基金资助项目(50308016)
山西省自然科学基金项目(20041019)
关键词
应县木塔
现场实测
动力特性
层刚度
频域传递函数
地震反应
Dynamic response
Earthquake resistance
Structural analysis
Transfer functions
Vibrations (mechanical)
