本研究探討高速鐵路系統含軌道簡支橋梁承受地震之動態反應，考慮靜止列車重量與軌道道碴對地震反應之影響，目的在瞭解地震作用下橋梁之耐震性與鋼軌之穩定性。文中亦討論分析振動單元包含不同橋梁跨數、不同橋墩高度、鋼軌、道碴與停放列車對分析結果準確性之影響。採用並瞭解橋梁受多支承效應對含軌道地震反應與鋼軌穩定性之影響。除各國不同性質地震記錄外，並以921集集烈震所收集之地震記錄為輸入資料。停放之列車包括歐洲系統與日本系統兩類。研究成果可供擬定高速鐵路用橋梁之耐震設計準則之參考及應用。
研究結果顯示列車停放於高橋墩橋梁上，橋梁伸縮縫附近鋼軌最大軸向應力，在PGA 300gal的各種地震作用下，30公尺高架橋梁系統，多高於中國鐵道規範容許值。多支承輸入產生之鋼軌最大軸向應力，通常超過同步支承輸入產生者，在設計以15公尺的低橋墩系統，其軸向主要頻率又與中南部縣市部份地盤頻率接近，系統產生共振，鋼軌軸向應力亦高於中國鐵道規範容許值，可能導致軌道受損。故在設計橋墩時，應儘可能避免高橋墩系統，也應防範與各區地盤共振頻率相近之結構系統。

The dynamic response of bridges with rails subjected to earthquakes is investigated in the present studies. The effects of foundation characteristics will be considered in the analysis to understand the safety of the bridge as well as the stability of rails during earthquakes. The objectives of the present studies are to understand the effects on dynamic responses of the bridge and the stability of the rails for different types of structure system.
In addition, the number of vibration units should be included in dynamic analysis is also discussed. Furthermore, the effect of multi-support excitation of earthquake input is investigated. The El Centro earthquake, Kobe earthquake, Mexico earthquake, and JiJi earthquake are used as excitations in numerical computations. Two train systems, namely the European system and the Japan system are involved in the computations.
The results of this investigation show that the 30m-pier bridge system is dangerous for rails during PAG300 gal earthquake. The maximum axial stress of the rail due to the multi-support excitation on the bridge systems is higher than that of the uniform excitation. And the frequency of 15-pier bridge will be resonant with some sites of Taiwan. In order to avoid the damage of rail-bridge system, the design of bridge should pay attention to the phenomena.

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