强震后基于泄流激励的映秀湾水电站拦河闸动态检测与损伤评估研究  

Dynamic detection and damage evaluation of Yingxiuwan hydropower station sluice under flood discharge excitation after strong seismic shock

作　　者：李火坤[1] 练继建[2] 杨敏[2] 张琦[3] 彭文明[3] 

机构地区：[1]南昌大学建筑工程学院,南昌330031 [2]天津大学建筑工程学院,天津300072 [3]中国水电顾问集团成都勘测设计研究院,成都610072

出　　处：《振动与冲击》2010年第9期64-68,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(50909049);江西省教育厅青年科学基金(GJJ100084);国家杰出青年科学基金(50725929)项目;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)资助

摘　　要：以泄流荷载作为激励源,基于泄流激励对结构产生的动力响应,在模态参数识别的频域分解法的基础上,提出模态一致性函数(MCF),解决通过CMIF指示函数拾取峰值是结构真实模态频率还是噪声引起的虚假模态频率(如水流噪声频率)的主观性难题,有效地提高了泄流激励下结构模态识别精度;在此基础上,对遭受汶川大地震的映秀湾水电站拦河闸结构进行了泄流激励条件下的现场动力测试与模态识别,同时对拦河闸结构在不同部位和不同损伤程度条件下的耦合动力特性进行了数值模拟,建立了拦河闸结构损伤评估样本库,最后进行了拦河闸结构损伤评估;通过拦河闸现场围堰检查结论与本检测结果的比较,两者吻合较好。所提出的方法可为泄流结构的灾后检测与评估提供一种新的便捷手段。Taking flood discharge exciting load as driving source and making use of structural dynamic response,the modal coherence function(MCF) was put forward to identify the CMIF curve peak of structure accurately and effectively based on the modal parameter identification method of frequency domain decomposition.The MCF solves the subjective problem of selection of CMIF curve peak to judge which one is the real structural frequency or the false frequency(such as noise frequency of flood discharge) and improves the accuracy of modal parameter identification.Then,on this basis,the dynamic test and structural modal parameter identification of Yingxiuwan hydropower station sluice were carried out under the condition of flood discharge excitation after the Wenchuang violent earthquake.Simultaneously,the flow-structure coupled dynamic characteristic of the sluice was simulated by numerical method with different damage location and damage degree,and the sample library of sluice for structural damage evaluation was set up.The damage evaluation of sluice structure was finally achieved.The results obtained in the paper are in good consistency with the conclusion made by the constructor after the field reclamation dam checking.The method presented provides a new convenient means for detection and evaluation of flood discharge structure after violent earthquake.

关 键 词：强震 泄流激励 拦河闸 损伤检测 

分 类 号：TV649[水利工程—水利水电工程]