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  本文關鍵詞： 連續(xù)剛構橋 有限元 動力分析 荷載試驗　出處：《重慶交通大學》2014年碩士論文　論文類型：學位論文

【摘要】：預應力混凝土（PC）連續(xù)剛構橋以其線形優(yōu)美、受力合理、施工方便、跨越能力大等諸多優(yōu)點在我國橋梁建設過程中得到廣泛應用，在橋梁結構建成通車之前需要對結構受力性能進行全面的檢測評定，荷載試驗作為檢測橋梁性能的最常用試驗方法之一發(fā)揮著重要作用。 本文首先回顧了連續(xù)剛構橋的發(fā)展歷程及受力特點，并系統(tǒng)闡述了橋梁結構試驗檢測的相關知識。以西蘇角特大橋為依托工程，從工程實際出發(fā)建立三維空間有限元模型，并結合靜載試驗對橋梁在車道荷載作用下內力進行分析；結合依托工程在邊跨布置永久壓重混凝土的工程實際，分析了壓重混凝土對橋梁整體線形的影響，提出了對設計壓重集度適當增大范圍的建議。 根據(jù)結構動力特性計算理論，采用子空間迭代法求解動力方程特征值及特征向量，計算出結構的自振模態(tài)；以依托工程的結構振型和頻率，詳細分析了高墩大跨連續(xù)剛構橋的各項動力特性，為今后此類橋梁的設計、施工以及運營管養(yǎng)提供參考；采用MIDAS/Civil移動荷載時程分析模塊，自定義車輛移動荷載時程函數(shù)，對不同車速下結構的動力響應進行分析，提取了不同車速下橋梁中跨跨中節(jié)點的位移時程數(shù)據(jù)，分析得出了車速與連續(xù)剛構橋的動力系數(shù)之間的變化規(guī)律。 簡要介紹了橋梁結構荷載試驗的相關理論；結合相關理論及有限元分析結果，制定試驗方案，包括試驗橋跨、控制截面、加載工況及車輛布載等，，按照試驗方案實施加載并對相關數(shù)據(jù)進行采集，通過與計算值對比得出校驗系數(shù)，利用校驗系數(shù)結合規(guī)范對橋梁的實際承載能力進行評價。 采用車輛荷載對橋跨進行跑車、剎車、跳車試驗以及脈動試驗，對結構動力特性及動力響應進行測試，與通過有限元模型得出的結構豎向振型和頻率進行對比，判定橋梁結構的動力特性是否正常，同時根據(jù)動載試驗實測數(shù)據(jù)計算出結構的沖擊系數(shù)和阻尼比等參數(shù)。
[Abstract]:Prestressed concrete continuous rigid frame bridge has been widely used in the process of bridge construction in our country with its advantages of graceful alignment, reasonable force, convenient construction and large span capacity. Before the bridge structure is completed and opened to traffic, it is necessary to carry out a comprehensive test and evaluation of the structure's mechanical performance. Load test plays an important role as one of the most commonly used test methods to test the bridge's performance. In this paper, the development history and stress characteristics of continuous rigid frame bridge are reviewed, and the related knowledge of bridge structure test and detection is expounded systematically. Based on the project of the large bridge in the west of Suzhou corner, a three-dimensional finite element model is established from the engineering practice. Combined with the static load test to analyze the internal force of the bridge under the action of driveway load, combined with the engineering practice of placing permanent compression concrete in the side span, the influence of the compression concrete on the overall alignment of the bridge is analyzed. The suggestion of increasing the range of design weight set is put forward. According to the theory of structural dynamic characteristic calculation, the eigenvalue and eigenvector of the dynamic equation are solved by subspace iteration method, and the natural vibration modes of the structure are calculated based on the structural mode and frequency of the engineering. The dynamic characteristics of long-span continuous rigid frame bridge with high piers are analyzed in detail, which provides a reference for the design, construction and operation of this kind of bridge in the future. The MIDAS/Civil moving load time history analysis module is used to define the vehicle moving load time history function. The dynamic response of the structure under different speeds is analyzed, and the displacement time history data of the mid-span node of the bridge under different speeds are extracted, and the variation law between the velocity and the dynamic coefficient of the continuous rigid frame bridge is obtained. This paper briefly introduces the relevant theory of the bridge structure load test, combines the relevant theory and the finite element analysis result, formulates the test plan, including the test bridge span, the control section, the loading condition and the vehicle distribution load, etc. According to the test scheme loading and collecting the relevant data the check coefficient is obtained by comparing with the calculated value and the actual bearing capacity of the bridge is evaluated by the check coefficient combined with the code. The vehicle load is used to test the dynamic characteristics and dynamic response of the bridge span by means of sports car, brake, jump test and pulsation test, which is compared with the vertical mode and frequency obtained by the finite element model. Whether the dynamic characteristics of bridge structure is normal or not, the parameters such as impact coefficient and damping ratio are calculated according to the measured data of dynamic load test.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.23;U441

【參考文獻】

相關期刊論文 前7條

1 王旭軍;鐘明全;劉建波;趙奮;;簡支梁橋上拱度對高速行車舒適性影響研究[J];重慶交通大學學報(自然科學版);2007年06期

2 李豐良,李敏;梁的位移測試[J];長沙鐵道學院學報;2003年03期

3 王岐峰,李炎,李萬恒,劉文峰;橋梁自振特性與承載能力分析[J];公路交通科技;2005年11期

4 金鳳溫;連續(xù)剛構橋的發(fā)展簡述[J];黑龍江交通科技;2005年07期

5 朱增輝;;應變增大系數(shù)在車輛荷載對橋梁結構沖擊效應評價中的應用[J];交通標準化;2012年10期

6 陳錫棟;楊婕;趙曉棟;范細秋;;有限元法的發(fā)展現(xiàn)狀及應用[J];中國制造業(yè)信息化;2010年11期

7 顧戌華;夏禾;郭薇薇;;城市軌道交通高架橋自振特性與動力響應研究[J];北方交通;2007年11期

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