三峡左导墙泄洪振动原型观测及其动态识别与安全评估  

Prototype observation of flood discharge-induced vibration and its dynamic identification and safety evaluation of Three Gorges left guide wall

作　　者：李火坤[1] 练继建[2] 刘永智[3] 

机构地区：[1]南昌大学建筑工程学院,江西南昌330031 [2]天津大学建筑工程学院,天津300072 [3]中国水电顾问集团西北勘测设计研究院,陕西西安710065

出　　处：《水利水运工程学报》2010年第3期59-64,共6页Hydro-Science and Engineering

基　　金：国家自然科学基金资助项目(50909049);国家杰出青年科学基金资助项目(50725929);江西省教育厅青年科学基金资助项目(GJJ10084);水利部公益性行业科研专项项目(200901081);西部交通建设科技项目(2009328000084)

摘　　要：利用汛期三峡枢纽工程泄洪期间泄流荷载对左导墙产生的激励作用,对三峡左导墙结构进行了原型动力响应测试,分析了导墙泄洪振动动位移响应均方根的沿程分布特征;在此基础上,以泄流荷载为激励源,利用动力响应对导墙结构的工作模态参数进行了动态识别;最后,综合导墙结构泄洪振动动位移原型观测、模态参数动态识别结果对三峡左导墙汛期的泄洪振动安全性进行了综合评估.结果表明,三峡左导墙泄洪振动安全,按M e ister感觉曲线标准,其泄洪振动响应属于"强烈地感觉到"阶段,但产生低阶共振可能性不大.Taking flood discharge loads as an excitation,the prototype observation of Three Gorges left guide wall is carried out and a distribution regularity of the root-mean-square of dynamic displacement response on the guide wall in the length direction is analyzed.Based on this prototype dynamic test,the operational modal parameter of the guide wall is identified under flood discharge excitation during flood season.Finally,based on the prototype dynamic displacement response and the identification result,the flood discharge vibration security of Three Gorges left guide wall is evaluated during flood season.The result shows that the flood discharge vibration of Three Gorges left guide wall is safe,and that the flood discharge vibration response belongs to ＂intensive perception＂ taking the Meister sensing curve as the criterion.

关 键 词：三峡左导墙 原型测试 泄流激励 动态识别 安全评估 

分 类 号：TV698.162[水利工程—水利水电工程]