苏  磊¹，  王国波²
    （1 北京赛博思建筑设计有限公司，北京100037；2 武汉理工大学道路桥梁与结构工程湖北省重点实验室，武汉430070）

[摘要] 武广客运专线武汉火车站的站房采用了上部大跨度复杂钢结构与下部桥梁共同组成的“桥建合一”的新型结构形式，结构动力性能和稳定分析难度大。基于移动荷载列作用下简支梁动力响应计算的基本理论，采用ANSYS软件建立移动荷载列-桥梁的数值计算模型，得到桥梁支座处反力时程曲线及富氏谱，然后以此支座反力作为上部大跨度钢结构的输入荷载，计算上部大跨度钢结构的动力响应，确定结构的薄弱部位，根据结构的组成，分别给出结构各部分的最大等效应力云图及时程曲线。计算结果可为进一步分析结构的疲劳寿命提供基础，提出的研究思路可为国内今后“桥建合一”结构形式的动力响应分析提供参考。
[关键词] 高速列车；桥建合一；大跨度钢网架结构；动力响应；Mises等效应力
中图分类号：U441.3    文献标识码：A  文章编号：1002-848X( 2011) S2 -0075 -05

    Dynamic responses analysis on large-span latticed steel structure under high speed train
    Su Lei¹, Wang Guobo²
    (1 Beijing SBS Architectural Design Co., Ltd., Beijing 100037, China; 2 Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, China)

Abstract: The special passenger railway from Wuhan to Guangzhou is the longest special passenger railway in China, and also with the features of the highest technical standards and the largest investment scales. The Wuhan Railway Station adopted the structure form of combination of bridge and building, wluch is difficult to analyze its dynamic behavior and structural stability. Numerical calculation model for moving loads and bridge was established by the software ANSYS based on the basic theory of dynamic response of simple supported beam. The time history of bearing reactions and its Fourier spectrum were obtained. Then, dynanuc responses of upper large-span latticed steel structure were calculated under the bearing reactions. The maximum equivalent Mises stresses contour and their time histories were presented according to different component of upper steel structure and weak parts were determined. The calculation results can provide foundation for fatigue analysis of weld nodes. And, the research approach can provide reference for similar structure dynanuc analysis in future.
Keywords: high speed train; unification of bridge and building; large-span steel structure; dynamic response; Mises equivalent stress