节点文献

基于演化谱理论的桥梁风致响应非平稳性分析

Nonstationary Analysis of Wind-induced Responses of Bridges Based on Evolutionary Spectrum Theory

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 丁幼亮周广东李万恒王晓晶闫昕

【Author】 DING You-liang;ZHOU Guang-dong;LI Wan-heng;WANG Xiao-jing;YAN Xin;Key Laboratory of C & PC Structures,Ministry of Education,Southeast University;Research Institute of Highway Ministry of Transport;

【机构】 东南大学混凝土及预应力混凝土结构教育部重点实验室交通运输部公路科学研究院

【摘要】 基于Priestley演化谱理论,并结合小波变换原理,在理论上推导了非平稳随机过程演化谱估计的小波时域函数加权和法,从小波时域函数的角度建立了演化谱估计时域方法,弥补了传统演化谱估计方法需要小波频域函数这一不足。在此基础上,对实测台风"麦莎"全过程以及润扬大桥悬索桥在台风"麦莎"作用下的抖振响应进行了演化谱估计,分析了台风全过程及其风致响应的时频特性。研究结果表明:小波时域函数加权和法是一种估计非平稳随机过程演化谱的有效方法;台风"麦莎"全过程表现为强度强非平稳、频率弱非平稳,脉动风的脉动能量在整个台风过程中变化较大但主要频率成分变化较小;润扬大桥悬索桥主梁的风致抖振响应表现为强度非平稳、频率平稳,振动能量变化剧烈但频率成分基本不变。

【Abstract】 Based on the principle of wavelet transform and the theory of evolutionary spectrum developed by Priestley,the property that the evolutionary spectrum was equal to the summation weighted wavelet functions in time domain was deduced.A method,which could overcome the shortage of the traditional method that the closed-form expression of wavelet in frequency domain was required,was established to estimate the evolutionary spectrum of nonstationary stochastic processes.Based on the field measurement data on Runyang Suspension Bridge,the evolutionary spectra of typhoon Matsa and wind-induced vibration in main girder were estimated and the timefrequency characteristics were analyzed.The results show that the proposed method can calculate the evolutionary spectrum of nonstationary stochastic processes accurately and effectively.The fluctuating wind of typhoon Matsa is high and nonstationary in intensity aspect but weak and nonstationary in frequency aspect.The energy of the fluctuating wind varies dramatically with the typhoon passing but the frequency components change little.The wind-induced vibration of the main girder of Runyang Suspension Bridge is nonstationary in intensity aspect and stationary in frequency aspect.When typhoon passing,the vibration energy changes obviously but the frequency components are constant.

【基金】 国家自然科学基金项目(51178100);“十二五”交通运输重大科技专项项目(2011318223170);江苏省自然科学基金项目(BK2011141);江苏省高校“青蓝工程”优秀青年骨干教师计划项目(1105000214);东南大学重大科学研究引导基金项目(3205001109)
  • 【文献出处】 中国公路学报 ,China Journal of Highway and Transport , 编辑部邮箱 ,2013年05期
  • 【分类号】U441.3
  • 【被引频次】5
  • 【下载频次】207
节点文献中: