使用等效簡化扣件組模型之軌橋互制行為分析;Track-Bridge Interaction Analysis Using Simplified Effective Fastener Model

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题名:	使用等效簡化扣件組模型之軌橋互制行為分析;Track-Bridge Interaction Analysis Using Simplified Effective Fastener Model
作者:	劉妍麟;Liu, Yen-Lin
贡献者:	土木工程學系
关键词:	鋼軌扣件系統;軌橋互制行為;墊片破壞;現地監測;SAP2000;Rail fastening system;Track-bridge interaction;Pad damage;Field measurement;SAP2000
日期:	2020-08-18
上传时间:	2020-09-02 14:35:26 (UTC+8)
出版者:	國立中央大學
摘要:	當軌道與橋梁互制作用影響時，鋼軌扣件系統必須有效束制鋼軌移動，若扣件系統中有組件破損，則會大幅增加鐵路上的養護成本。本研究主要探討現地三種不同路段之行為模式，分別為平直段、陡坡段與曲線段，路段中有鋼軌墊片與基鈑墊片大量破損問題，故此研究旨在發展一套能快速而精確模擬軌橋互制行為的數值分析模型，且根據鋼軌扣件組行為以LS-Dyna進行詳細3D接觸動力行為的模擬分析結果，以有限元素軟體SAP2000使用剛架與彈簧元素建立精確分析之等效簡化扣件組模型，依據欲分析之不同路段行為提出相應簡化程度之模型，應用於現地橋梁與軌道系統當中，探討長區段軌橋系統在溫度荷載、列車荷載、扣件組螺栓鎖固力等等外力載重產生之行為變化，並與現地檢監測數據做比對驗證，確保模型正確性，然而找出墊片破壞的可能原因與範圍並研擬可行之改善方法，將來可作為大尺度軌道橋梁數值模擬分析的參考依據，具經濟性及效益性。;The rail fastening system must effectively fix the rails due to the track- bridge interaction. If any component in the rail fastening system is damaged, it will greatly increase the maintenance cost of the railway. This research mainly discusses the behavior patterns of three different spans, namely straight span, steep slope span and curved span. There are a large number of damage to rail pads and intermediate pads in the spans. Therefore, the research progresses to develop a set of numerical analysis models that can quickly and accurately simulate the behavior of track-bridge interaction. Based on the behavior results of the rail fastening system that use LS-Dyna to perform detailed 3D contact dynamic behavior simulation analysis. From the results, use the finite element software SAP2000 establish an equivalent simplified fastener model for accurate analysis by rigid frame and spring elements , propose corresponding simplified model based on the behavior of different segments to be analyzed. Replace it on field track-bridge system and discuss the behavioral changes of the rail bridge system under external load such as temperature change , train moving load, fastener bolt locking force, and so on. In addition, finite element analysis was conducted and the results were compared with the measured track-bridge interaction response. Find out the possible cause and the influence area of pad damage then develop feasible improvement methods. In the future, it can be used as a reference basis for numerical simulation analysis of large-scale rail bridges, which is economical and beneficial.
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