在進行軌道設計時，時常為了達成特定的條件而去更動軌道構件的尺寸、勁度、間距等，其中軌枕間距的大小在設計時往往落在600mm左右，似乎沒有過多調整的空間也鮮少探討軌枕間距對軌道承載力的影響，參考我國規範中也並未發現對軌枕間距的適用性做詳細的說明，因此本研究鎖定使用60kg特甲級線直線段軌道配置，探討軌枕間距對軌道構件位移、應力的影響，並與各項檢核參數的容許值比對，試圖了解規範訂定的目的，並歸納出控制軌枕間距大小的關鍵檢核項目。
本研究使用彈性支承梁模型、三維彈性解析解模型兩種模型進行分析，前者在取得支承勁度(軌道模數K)後可用於計算鋼軌位移、鋼軌底部彎曲應力、軌座處彎曲應力、軌枕中央彎曲應力、道碴正向應力、路基正向應力的大小，但由於模型過於簡化，無法反應軌枕間距對支承勁度的影響，因此導入三維彈性解析解模型，此模型考量真實軌道配置下各構件間的力學傳遞行為，並可藉由兩模型間的迭代求得不同軌枕間距下的軌道模數K值。
研究結果顯示，使用較大的軌枕間距，會使軌道承載力下降，其中以鋼軌垂直位移、路基正向應力、軌道抗挫屈能力為控制軌枕間距大小的關鍵檢核項目，因此未來若欲檢核軌枕間距的影響，應優先考慮三者的影響。

In rail design, dimensions, stiffness, and spacing of track components are often adjusted to meet specific conditions. Sleeper spacing is typically set around 600mm with limited flexibility and is rarely discussed for its impact on track load-bearing capacity. National standards also lack detailed guidelines on sleeper spacing applicability. This study focuses on 60kg/m heavy-duty straight tracks, examining the effects of sleeper spacing on track component displacement and stress, and comparing them with permissible values to identify key factors for controlling sleeper spacing.
Two models are used for analysis: the beam of elastic foundation model (BOEF Model) and the three-dimensional elastic analytical model. The former calculates rail displacement, bending stresses, rail-seat bending stress, sleeper center bending stress, ballast vertical stress, and subgrade vertical stress after obtaining the track modulus (K). However, it oversimplifies and cannot reflect sleeper spacing impact on support stiffness-Track modulus (K). The three-dimensional model considers mechanical transmission between components and iterates with the BOEF model to determine K for various sleeper spacing.
Results show that larger sleeper spacing reduces track load-bearing capacity, with key factors being rail vertical displacement, subgrade vertical stress, and the buckling resistance of the track. Future evaluations of sleeper spacing should prioritize these factors.

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