軌道隔振機構對行駛高架路段列車之動態反應與大地入力之影響

Effects of Vibration Isolation on the Dynamic Response of Train and Ground Impact

洪振發(Chen-Far Hung) ； 何彥興(Yen-Hsin Ho)

《中華民國振動與噪音工程學會論文集》 2014 (2014/06) Pp. 130-136

摘要

列車行經高架段引致高架橋振動，經由橋柱傳入大地，引起鄰近建物之振動，為降低行駛列車引致振動而引進隔振設施，隔離承受列車衝擊的鋼軌與軌道結構之間的動力傳遞，以達到減振效果。本文探討捷運高架橋路段採用高隔振基鈑與浮動式道床後對高架對大地入力的影響，同時檢討隔振系統對列車振動的影響。依據高架橋結構建立完整FEM模型模擬列車行經高架橋，進行行駛列車衝擊軌道引致振動之暫態分析，檢核高隔振基鈑與浮動式道床兩種減振措施對列車車體振動與高架橋振動對大地入力的影響。分析結果以頻譜插入損失，檢討高隔振基鈑與浮動式道床對於減振的有效頻率範圍。

關鍵字

列車 ； 高架橋 ； 振動 ； 高隔振基鈑 ； 浮動式道床 ； 插入損失

並列摘要

The vibration of viaduct induced by moving trains can be transmitted through piers impacting on the ground and causes the vibration of neighbor buildings. To reduce the vibration induced by moving trains, the vibration isolation will be introduced in order to reduce the transmitted force between rail and roadbed. The paper investigated the performance of vibration mitigation for two types of isolators, named the Non-ballast high insulation track (NBHI) and the Floating Slab Track (FST). The effects of the isolators on the ground impact transmitted by piers and the dynamic behavior of trains were investigated. The 3D FE-model for 4 spans viaduct structure was established based on the drawing of a viaduct of Taipei MRT. The train rolling on the viaduct was simulated, and the transient dynamic analysis for the response of train, track and viaduct structures induced by moving trains was performed. The dynamic behaviors of moving train and impact on ground for using the two types were examined; the results between the cases were compared. The performance of vibration mitigation was expressed by the insertion loss of 1/3 octave band spectrum

並列關鍵字

Train ； viaduct ； vibration ； Non-ballast high insulation track (MBHI) ； Floating Slab Track (FST) ； insertion loss