基于荷载谱的桥梁交通激励模型  

Force spectrum-based traffic excitation model for highway bridges

作　　者：宋静[1] 吴子燕[1] 林湘[1] 覃小文[1] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072

出　　处：《河北工程大学学报（自然科学版）》2007年第2期15-19,共5页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家高技术研究发展计划(2006AA04Z437)

摘　　要：提出了一种基于荷载谱的桥梁交通激励模型,给出建立这种激励模型功率谱密度矩阵的方法。应用动力节点加载方法,将移动荷载转化为等效的节点荷载;对过滤的泊松过程应用坎贝尔定理。数值分析表明,机车按正常稳定的速度行驶,此种模型可以反映桥梁交通激励的主要性质,识别机车荷载作用下桥梁的结构特性。A traffic excitation model based on force spectrum were presented, a method to construct this model＇ s spectrum density matrix which involves first converting the moving load into equivalent nodal excitation by the dynamic nodal loading approach were proposed; then the Campbell＇s theorem applied for the filtered Poisson Process. The result of numerical analysis shows that the proposed model can represent the primary nature of the traffic excitation as long as the normal speed of the vehicles on the bridge.

关 键 词：桥梁健康监测 交通激励 仅基于输出的系统识别 移动荷载 白噪声模型 空间相关性 

分 类 号：U441[建筑科学—桥梁与隧道工程]