桥梁结构移动平稳随机荷载识别新方法  

A new method for the identification of a stationary random load moving on bridge structure

作　　者：侯秀慧[1] 邓子辰[1,2] 黄立新[1] 胡伟鹏[1] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072 [2]大连理工大学工业装备结构分析国家重点实验室,大连116024

出　　处：《计算力学学报》2009年第5期659-663,共5页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(10572119;10772147;10632030);教育部博士点基金(20070699028);陕西省自然科学基金(2006A07);工业装备结构分析国家重点实验室开放基金;西北工业大学创新种子基金(Z200730)资助项目

摘　　要：移动的平稳随机荷载对简支梁的作用,相当于固定的调制函数已知的非平稳随机荷载对简支梁结构的作用。本文以此为基础,研究了移动平稳随机荷载的识别问题。首先基于虚拟激励法的思想,利用特征值分解及奇异值分解技术,由虚拟位移响应反演虚拟广义坐标,有效地避免了矩阵求逆,得到高精度的广义坐标谱;同时利用Wiener-Khintchine关系及Duhamel积分,由广义坐标谱值反演得到平稳随机激励谱密度。仿真算例表明,只要适当地选取参振振型及测点位置,本文方法可以有效地识别桥梁结构的移动平稳随机荷载。The stationary random load moving on bridge structure is identified based on the fact that the effect of this load is the same as that of a fixed non-stationary random load with known modulated function. Firstly, the idea of pseudo excitation method was introduced into the identification of pseudo generalized coordinate from pseudo displacement response with the technique of eigenvalue and singular value decomposition, which avoided the matrix inversion and accordingly improved the identification precision. Then the stationary random load spectra was decided from the pseudo generalized coordinate spectra by using the Wiener-Khintchine relation and Duhamel integration. Numerical results show that, with a good choice of the number of mode and the response measuring position, the method presented here can identify the stationary random load moving on bridge structure effectively.

关 键 词：桥梁结构 移动荷载 荷载识别 随机荷载 精度分析 

分 类 号：TU311[建筑科学—结构工程]