目前興建中的高雄輕軌為嵌埋式軌道，其鋼軌由彈性包覆材包覆，並嵌埋於混凝土軌道版中，為連續支承式軌道；高雄輕軌的營運路段中有一段為經過愛河橋之跨橋段，由於高雄輕軌所有軌道皆為連續長焊鋼軌，因此在經過橋梁之軌道會因為橋軌互制使鋼軌軸力複雜化，進而可能發生挫屈或拉斷等風險。
本研究將使用有限元素軟體Abaqus進行分析，對包覆鋼軌之彈性包覆材的材料參數進行實際試驗作為驗證，並建立與實際試驗相同之軌道模型驗證本研究的軌道有限元素模型之可行性；最後建立軌道-橋梁之有限元素模型，改變模型環境溫度，並分析軌道模型在增溫與降溫的軸力變化，本研究使用Abaqus進行挫屈模態分析，找出軌道挫屈之臨界載重，觀察軌道溫度上升所產生之軸力會大於挫屈臨界載重，而軌道溫度下降時產生之拉應力則是小於鋼軌最小抗拉強度，最後根據分析結果判斷軌道在跨橋段需裝設伸縮接頭以避免發生挫屈或拉斷的行為。

The light rail currently constructing in Kaohsiung is embedded rail, its rails made of an elastic coating material coated and embedded in concrete track slab, and it is continuous support track system. There is a passage of Kaohsiung Light Rail’s railroad lines has crossed the bridge of love river, all the tracks of Kaohsiung Light Rail are continuous welded rail, so the track on the bridge will have track-bridge interaction and cause the axial force of the rail become complicated, which may cause buckling or tensile failure and other risks.
The thesis used finite element software Abaqus to analysis the subject. The material parameters of the elastic coating material would have experiment as verification, and establish the track model the same as actual track to validate the feasibility of the finite element model. Finally, the thesis will establish the track-bridge finite element model, changing the temperature of the ambient, and analyzing the axial force of the rail during the warming and cooling. The thesis used Abaqus to run the buckling modal analysis to identify the critical buckling load of the track, and observing the axial force of the track generated from temperature increased will be greater than the critical buckling load. The result of the tensile stress of the rail generated from the temperature decreased is lower than the minimum tensile strength of the rail. Finally, according to the model analysis to determine the track on bridge needs to install the expansion joints to avoid buckling or tensile failure.

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