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    蘇  磊¹，  王國波²
    （1 北京賽博思建筑設計有限公司，北京100037；2 武漢理工大學道路橋梁與結(jié)構工程湖北省重點實驗室，武漢430070）

[摘要] 武廣客運專線武漢火車站的站房采用了上部大跨度復雜鋼結(jié)構與下部橋梁共同組成的“橋建合一”的新型結(jié)構形式，結(jié)構動力性能和穩(wěn)定分析難度大。基于移動荷載列作用下簡支梁動力響應計算的基本理論，采用ANSYS軟件建立移動荷載列-橋梁的數(shù)值計算模型，得到橋梁支座處反力時程曲線及富氏譜，然后以此支座反力作為上部大跨度鋼結(jié)構的輸入荷載，計算上部大跨度鋼結(jié)構的動力響應，確定結(jié)構的薄弱部位，根據(jù)結(jié)構的組成，分別給出結(jié)構各部分的最大等效應力云圖及時程曲線。計算結(jié)果可為進一步分析結(jié)構的疲勞壽命提供基礎，提出的研究思路可為國內(nèi)今后“橋建合一”結(jié)構形式的動力響應分析提供參考。
[關鍵詞] 高速列車；橋建合一；大跨度鋼網(wǎng)架結(jié)構；動力響應；Mises等效應力
中圖分類號：U441.3    文獻標識碼：A  文章編號：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