泄流条件下的溢流坝结构原型动力测试与模态参数识别  

Research on Prototype Vibration Tests and Modal Parameter Identification of the Spillway Dam under the Condition of Flood Discharge Excitation

作　　者：李火坤[1] 张建伟[2] 练继建[3] 李松辉[4] 

机构地区：[1]南昌大学建筑工程学院,南昌330031 [2]华北水利水电学院,郑州450011 [3]天津大学建筑工程学院,天津300072 [4]中国水利水电科学研究院,北京100044

出　　处：《中国农村水利水电》2009年第12期99-102,105,共5页China Rural Water and Hydropower

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;50779044;50909049);华北水利水电学院高层次人才科研启动资助项目

摘　　要：在溢流坝泄流条件下,基于泄流荷载对溢流坝结构产生的激励作用,对溢流坝结构进行了原型动力测试,并以原型动力测试响应信号为依据,运用随机子空间法进行了基于泄流激励的溢流坝结构模态参数识别,得到了溢流坝结构在泄流条件下的动力特性参数,同时采用有限元方法对"溢流坝-水体-地基"耦合动力特性进行了计算分析,并与其动力特性识别结果进行了对比,结果表明,识别结果与计算结果基本吻合,溢流坝泄流工作性态与有限元模拟情况基本一致。Based on the effect of flood discharge excitation on the spillway dam under the condition of flood discharge, the prototype dynamic test of spillway dams is carried out. Then the modal parameter of the spillway dam is identified with the dynamic response output only under the flood discharge excitation based on the stochastic subspace identification （SSI） method, and the dynamic characteristic of spillway dams is obtained. At the same time, the coupled dynamic characteristic of ＂spillway dam structure-foundationwater＂ is simulated through FEA method, and the results of modal parameter identification and calculation are compared. The result shows that the identification result agrees with the calculation result and the working state of spillway dams under flood discharge corresponds with the FEA simulated condition,

关 键 词：溢流坝 动力测试 泄流激励 模态识别 

分 类 号：TV65[水利工程—水利水电工程]