- 學位論文
鐵路橋梁道岔區域車橋軌互制效應之研究
Research on Vehicle-Bridge-Track Interaction Effect for Turnout Zone of Railway Bridge
摘要
由於國內對於移動載重通過道岔區結構之研究較為缺乏，因此實有必要對此問題做深入的探討。本文旨在探討既有鐵路橋梁之道岔區域結構系統互制行為，由於理論解析的方式在實際橋梁的應用上有很大的限制，故以數值模擬來研究鐵路橋梁於不同溫度與列車通過軌道道岔區域時，列車-橋梁-軌道間之互制效應行為。 文中透過有限元素分析軟體Midas Civil進行分析，首先以論例的解析解驗證分析軟體的準確性，然後再以一實際案例作為驗證此軟體所建立模型之正確性，最後本研究核心為針對鐵路橋梁道岔區域受等速移動列車載重作用時，採用數值模擬的方式求得軌道道岔區域的動態反應，並探討因溫度變化而產生熱漲冷縮造成軌道挫屈或斷裂之影響。 此外，以往對軌道結構分析多以二維梁元素為主，實無法反映出三維動態特性結果，故本文利用有限元素分析軟體建立橋梁、道岔區軌道兩者間結構力學互制三維分析模型，進行移動載重於橋梁與道岔區軌道兩者間三維動力互制的數值模擬分析技術，目的在於建立一有效之模擬分析工具及方法並應用在實際的工程問題上。
並列摘要
This thesis aims at studying the interaction between train, rail and bridge structure, particularly for the railway bridges with the turnout zone. Since the theoretical analysis is unavailable to such kind of complicated problem, the finite element method (FEM) as numerical analysis is taken into account as tool for solution. The commercial FEM software of MIDAS-CIVIL is adopted and the results obtained from the conventional problem related to a simply supported beam subjected to moving loads are investigated by those of the theoretical analysis in advance. Sequentially, the data of structural responses given by a monitoring system on a real railway-viaduct serves as the data-base for the investigation of the FEM model. A complicated three-dimensional (3D) FEM model consisting of rail in turnout zone, sleeper, fastener, bridge deck, bridge girder and piers is established to consider the multiple interactions between various components of the railway bridge subjected to different kinds of moving train. The results obtained in this thesis could benefit the engineers a better understanding of the structural behavior concerned.