基于强震观测的拱坝模态参数识别的对比研究
发布时间:2018-05-19 04:40
本文选题:强震观测 + 模态参数识别 ; 参考:《地震工程与工程振动》2017年02期
【摘要】:大坝的强震观测是传感器测量的结构在地震激励下实际的振动反应。基于强震观测进行混凝土拱坝模态参数识别,可为结构的抗震分析、健康诊断和震损评估等提供基础。本文基于Pacoima拱坝的3次地震观测数据,分别采用"输入-输出"型和"仅考虑输出"型两类方法对大坝的模态参数进行了识别,并对不同地震记录下,不同方法的识别结果进行对比。同时,结合国内外不同学者通过数值计算、大坝原型动力试验和运行模态分析等方式得到的Pacoima拱坝模态参数识别的结果,分析了基于强震观测的模态识别结果与上述方式获得的模态参数的差异,并分析了差异产生的原因。相关的研究成果,可为后续的研究提供参考。
[Abstract]:The strong earthquake observation of the dam is the actual vibration response of the structure measured by the sensor under the earthquake excitation. Modal parameter identification of concrete arch dam based on strong earthquake observation can provide foundation for seismic analysis, health diagnosis and earthquake damage assessment of structures. Based on the three seismic observation data of Pacoima arch dam, the modal parameters of the dam are identified by the two methods of "input-output" type and "only considering output" type, respectively, and the different seismic records are given. The results of different methods are compared. At the same time, combined with the results of modal parameter identification of Pacoima arch dam obtained by different scholars at home and abroad through numerical calculation, prototype dynamic test of dam and operation modal analysis, etc. The differences between the modal identification results based on strong earthquake observation and the modal parameters obtained by the above methods are analyzed, and the causes of the differences are analyzed. The related research results can provide a reference for further research.
【作者单位】: 西安理工大学西北旱区生态水利工程国家重点实验室培育基地;河海大学水文水资源与水利工程科学国家重点实验室;福州大学至诚学院;
【基金】:国家自然科学基金项目(51409205,51579085) 博士后自然科学基金项目(2015M572656XB) 陕西省博士后自然科学基金项目 水文水资源与水利工程科学国家重点实验室开放研究基金项目(2014491011) 西安理工大学水利水电学院青年科技创新团队(2016ZZKT-14)~~
【分类号】:TV698.13
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