基于强震观测的拱坝模态参数识别的对比研究  

The comparative research of identification of modal parameters on arch dam based on strong earthquake observation records

作　　者：仝飞[1] 程琳[1,2] 杨杰[1] 郑东健[2] 陈诗怡[3] 

机构地区：[1]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 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]福州大学至诚学院,福建福州350002

出　　处：《地震工程与工程振动》2017年第2期37-46,共10页Earthquake Engineering and Engineering Dynamics

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)~~

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。The earthquake observation of dam is the structure of the sensor to measure the actual vibration response under earthquake excitation. The identification of modal parameter based on the strong earthquake observation for concrete arch dam can provide the basis for the seismic analysis of structure, health diagnosis and the earthquake damage assessment. This essay adopts ＂input-output＂ and ＂only output＂ two kinds of methods to identify modal parameters based on the three times of strong earthquake observation records of Pacoima arch dam. According to different seismic records, this essay compares the identification results of different methods. Meanwhile, this essay combines with different home and abroad scholars＇ modal parameter identification results on Pacoima arch dam which are got by numerical calculation, the dam prototype dynamic test and operational modal analysis methods. This essay analyses the differences of modal parameters between the modal identification based on the strong earthquake observation and the method mentioned above. In addition this essay also analyses the causes of differences. These related research results can provide reference for subsequent research.

关 键 词：强震观测 模态参数识别 混凝土拱坝 随机子空间(SSI) 增强型频域分解(EFDD) 

分 类 号：P315.73[天文地球—地震学] TU413.62[天文地球—固体地球物理学]