频率非平稳对大岗山拱坝非线性响应的影响
|
摘要
本文以大岗山拱坝为例,研究频率非平稳特性对坝体非线性响应的影响。选择不同的实际地震动时程作为计算输入,通过研究这些时程的时频特性,确定对坝体非线性响应影响较显著的一些因素。尽量统一可能对坝体非线性响应产生影响的其它时程特性,使得频率非平稳特性成为唯一或少量影响因素之一,从而最大限度地考虑频率非平稳的作用。结果显示,渐进谱峰值结合渐进谱的分布形式可以较好解释大岗山拱坝的非线性计算结果。
This paper studies the influence of frequency non-stationary input earthquake on nonlinear responses of arc dam through a case study of Dagangshan project.First,the major factors that influence the nonlinear responses of the dam are determined by analyzing the time/frequency-domain features of the input accelerograms selected from various records of actual earthquakes.Then,constraints are implemented on certain factors to eliminate their effects and make the non-stationary frequency a unique factor or a dominant factor on the nonlinear responses.Results show that this is a practical way of maximizing the effect of non-stationary frequency,and that in this way the nonlinear responses of Dagangshan arch dam can be well explained by combining their peak values with their distributed evolutionary spectra.
This paper studies the influence of frequency non-stationary input earthquake on nonlinear responses of arc dam through a case study of Dagangshan project.First,the major factors that influence the nonlinear responses of the dam are determined by analyzing the time/frequency-domain features of the input accelerograms selected from various records of actual earthquakes.Then,constraints are implemented on certain factors to eliminate their effects and make the non-stationary frequency a unique factor or a dominant factor on the nonlinear responses.Results show that this is a practical way of maximizing the effect of non-stationary frequency,and that in this way the nonlinear responses of Dagangshan arch dam can be well explained by combining their peak values with their distributed evolutionary spectra.
引文
[1]Conte J P.Effects of earthquake frequency nonstationary on inelastic structural response[C].//Proceedings of the 10th WorldConference on Earthquake Engineering,Madrid,Spain,1992,3645～3651.
[2]Kubo T.Significance of nonstationary frequency properties of strong earthquake ground motion on inelastic response of structuralsystem[C].//Proceedings of the 9th.Japan Earthquake Engineering Symposium,Tokyo,Japan,1994,1663～1668.
[3]曹晖,林学鹏.地震动非平稳特性对结构非线性响应影响的分析[J].工程力学,2006,23(12):30～35.CAO Hui,LIN Xuepeng.The effect of nonstationary characteristic of earthquake ground motion on the structure nonlinear response[J].Engineering Mechanics,2006,23(12):30～35.(in Chinese)
[4]涂劲.有缝界面的混凝土高坝-地基系统非线性地震波动反应分析[D].北京:中国水利水电科学研究院,1999.TU Jin.Nonlinear seismic response analysis of high concrete dam-foundation systems with joint surface[D].Beijing:China Instituteof Water Resources and Hydropower Research,1999.(in Chinese)
[5]Arias A.A measure of earthquake intensity[M].In:Hansen,R.J.(ed.)Seismic Design for Nuclear Power Plants,Cambridge,Massachusetts:MIT Press,1970,438～483.
[6]张翠然,陈厚群.非平稳地震动时程的渐进谱研究[J].水利学报,2007,38(12):1475～1481.ZHANG Cuiran,CHEN Houqun.Study on evolutionary power spectra of non-stationary earthquake accelerograms[J].Journal ofHydraulic Engineering,2007,38(12):1475～1481.(in Chinese)
[2]Kubo T.Significance of nonstationary frequency properties of strong earthquake ground motion on inelastic response of structuralsystem[C].//Proceedings of the 9th.Japan Earthquake Engineering Symposium,Tokyo,Japan,1994,1663～1668.
[3]曹晖,林学鹏.地震动非平稳特性对结构非线性响应影响的分析[J].工程力学,2006,23(12):30～35.CAO Hui,LIN Xuepeng.The effect of nonstationary characteristic of earthquake ground motion on the structure nonlinear response[J].Engineering Mechanics,2006,23(12):30～35.(in Chinese)
[4]涂劲.有缝界面的混凝土高坝-地基系统非线性地震波动反应分析[D].北京:中国水利水电科学研究院,1999.TU Jin.Nonlinear seismic response analysis of high concrete dam-foundation systems with joint surface[D].Beijing:China Instituteof Water Resources and Hydropower Research,1999.(in Chinese)
[5]Arias A.A measure of earthquake intensity[M].In:Hansen,R.J.(ed.)Seismic Design for Nuclear Power Plants,Cambridge,Massachusetts:MIT Press,1970,438～483.
[6]张翠然,陈厚群.非平稳地震动时程的渐进谱研究[J].水利学报,2007,38(12):1475～1481.ZHANG Cuiran,CHEN Houqun.Study on evolutionary power spectra of non-stationary earthquake accelerograms[J].Journal ofHydraulic Engineering,2007,38(12):1475～1481.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心