基于地震实测记录的二滩拱坝模态参数识别  

Modal parameter identification of Ertan arch dam based on seismic response data

作　　者：寇立夯[1] 王琳[1] 徐艳杰[1] 金峰[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水利水运工程学报》2008年第3期8-14,共7页Hydro-Science and Engineering

基　　金：国家自然科学基金资助项目(90510018);国家自然科学基金委员会和二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50539020)

摘　　要：结合二滩拱坝强震观测台阵在四川普格地震中的记录资料,利用频谱分析和时间序列分析,对二滩拱坝的频率、阻尼、振型等模态参数进行了识别.在识别结果的基础上,通过动力有限元计算的频率和实测频率相逼近的原则,建立了相应的有限元模型.识别结果表明,考虑地震时的水位条件,二滩拱坝的一阶振型为对称振型,二阶为反对称振型,特征频率分别为1.58 Hz和1.63 Hz,相应的阻尼比分别为1.5%和2.2%,拱坝的高阶阻尼比稍高,但一般不超过5%.The natural frequency, damping and mode shape of Ertan arch dam is identified using accelerations recorded at Ertan arch dam＇s strong ground motion stations during Puge earthquake in Sichuan. For the identification of dam modal parameters, methods of spectrum analysis and time series analysis are used. At the end, the FEM model of Ertan arch dam is developed considering the accordance of frequency identified and computed. Identified results demonstrate that the first model is symmetric and the second one is antisymmetric. The first two natural frequencies are 1.58 Hz and 1.63 Hz respectively, with the damping ratio of 1.5% and 2.2%.

关 键 词：水工结构 系统识别 二滩拱坝 地震资料 

分 类 号：TV642.4[水利工程—水利水电工程]