薄壁箱梁桥自由振动的半解析分析  

SEMI-ANALYTICAL METHOD FOR FREE VIBRATION ANALYSIS OF BRIDGE WITH THIN-WALLED CROSS SECTIONS

作　　者：徐杏华[1] 李朝 丛敏 林森 

机构地区：[1]孝感学院城市建设学院,湖北孝感432000 [2]长春市轨道交通集团有限公司,长春130012

出　　处：《建筑技术开发》2012年第2期5-9,共5页Building Technology Development

摘　　要：以常微分方程求解器为工具,利用半解析方法对薄壁简支箱梁桥的自由振动进行了分析计算,建立了具有连续分布质量和刚度的三维连续化动力分析模型,也就是将箱梁简化为一个带凸缘的薄壁筒组合体。计算结果表明,分析模型是合理的、可行的,从而为认识此类结构的动力特性提供了一种新的途径和方法。The free vibration analysis of simple beams with thin-walled cross sections is performed by semi-analytical method based on ODE （ Ordinary Differential Equation ） solver, using a model of continuously distributed masses and stiffness in space dimension. That is, the box girder bridge is simplified equivalently into a three-dimensional model, a thin-walled tubular structure with a flange. The computed results indicate that the model is reasonable and feasible, and a new approach and dynamic analytical method is developed for the insight into dynamic performance of box girder structures.

关 键 词：桥梁结构 自由振动 半解析方法 常微分方程求解器 

分 类 号：TU973[建筑科学—结构工程]