基于泄流响应的高拱坝振源时域识别  

Time Domain Identification of Excitation Source for High Arc Dam Based on Discharge Flow Vibration Response

作　　者：张建伟[1] 崔广涛[1] 马斌[1] 李火坤[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报》2008年第9期1124-1129,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家杰出青年科学基金资助项目(50725929);国家自然科学基金资助项目(50539060，50679052)

摘　　要：高坝泄流诱发坝体振动的振源识别一直是水利界所关注的课题之一.在小波理论、结构动力学及随机振动理论的基础上,提出了基于小波正交算子变换的多振源反分析方法,并结合水工结构的特点,探讨了进行振源识别时所需注意的关键技术问题.以拉西瓦拱坝水弹性模型为研究对象,通过少量测点的动位移实测值,反分析各等效激励荷载时程,进而对拉西瓦拱坝的流激振动进行全面评估,为拱坝结构的动态监测和损伤诊断提供了基础.How to identify excitation sources inducing vibration of high dam is one of the concerned problems for water conservancy. Based on wavelet theory, dynamics and stochastic vibration theory, a back analysis method for identifying multi-excitation sources was put forward using wavelet orthogonal operator transform in this paper. According to the characteristics of hydraulic structure, the key technical problems of identifying the sources were discussed. Based on the hydroelastic model of Laxiwa arc dam, the equivalent loads were computed depending on observed dynamic displacements, and then comprehensive evaluation aiming at flow-induced vibration of the dam was done. This provides the basis for dynamic monitoring and damage diagnosis of arc dam.

关 键 词：水工结构 流激振动 振源识别 小波变换 拱坝 

分 类 号：TV135[水利工程—水力学及河流动力学]