| 基于地震记录的混凝土拱坝模态识别结果评价研究 |
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| 引用本文： | 武璠,程琳,杨杰,郑东健.基于地震记录的混凝土拱坝模态识别结果评价研究[J].西北地震学报,2021,43(6):1460-1471. |
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| 作者姓名： | 武璠 程琳 杨杰 郑东健 |
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| 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, 陕西 西安 710048;河海大学水利水电学院, 江苏 南 京 210098 |
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| 基金项目： | 国家自然科学基金（51809212）;陕西省自然科学基础研究计划重点项目（2018JZ5010）;陕西省水利科技计划项目（2018SLKJ-5）;陕西省自然科学基础研究计划-引汉济渭联合基金项目（2019JLM-55） |
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| 摘 要： | 利用混凝土拱坝地震记录识别的模态参数,可以揭示结构在地震过程中实际动力特性的变化情况,为结构地震反应分析和震后损伤评估提供重要信息。首先对模态识别常用方法的基本原理进行介绍;然后利用龙羊峡拱坝两次地震观测数据,采用"输入—输出"型和"仅考虑输出"型两类方法对大坝模态参数进行识别;最后将获得的模态识别结果与工程经验值和其他学者的研究成果进行对比,以分析评价识别结果的合理性。相关研究成果可为基于地震记录的混凝土拱坝模态参数识别的工程应用提供经验借鉴。
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| 关 键 词： | 混凝土拱坝 地震记录 模态识别 特征系统实现算法(ERA) 随机子空间(SSI) |
| 收稿时间： | 2020/6/27 0:00:00 |
Evaluation of modal identification results of concrete arch dams based on seismic records |
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| WU Fan,CHENG Lin,YANG Jie,ZHENG Dongjian.Evaluation of modal identification results of concrete arch dams based on seismic records[J].Northwestern Seismological Journal,2021,43(6):1460-1471. |
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| Authors: | WU Fan CHENG Lin YANG Jie ZHENG Dongjian |
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| Institution: | State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, Shaanxi, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, Jiangsu, China |
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| Abstract: | The modal parameters identified from seismic records of concrete arch dams can reveal the variation of actual dynamic characteristics of the structure during earthquake, thus providing important information for seismic response analysis and post-earthquake damage assessment of the structure. In this paper, the basic principles of common modal identification methods were first introduced. Then, the observation data of two earthquakes were used to identify the modal parameters of Longyangxia arch dam by using two different methods of "input-output" and "output-only". Finally, the rationality of the modal identification results in this paper were analyzed by comparing with the engineering experience values and the research results of other scholars. The research results can provide experience and reference for similar projects. |
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| Keywords: | concrete arch dam seismic record modal identification eigensystem realization algorithm (ERA) stochastic subspace identification (SSI) |
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