本文關(guān)鍵詞： 連續(xù)剛構(gòu)橋 有限元 動(dòng)力分析 荷載試驗(yàn)　出處：《重慶交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：預(yù)應(yīng)力混凝土（PC）連續(xù)剛構(gòu)橋以其線(xiàn)形優(yōu)美、受力合理、施工方便、跨越能力大等諸多優(yōu)點(diǎn)在我國(guó)橋梁建設(shè)過(guò)程中得到廣泛應(yīng)用，在橋梁結(jié)構(gòu)建成通車(chē)之前需要對(duì)結(jié)構(gòu)受力性能進(jìn)行全面的檢測(cè)評(píng)定，荷載試驗(yàn)作為檢測(cè)橋梁性能的最常用試驗(yàn)方法之一發(fā)揮著重要作用。 本文首先回顧了連續(xù)剛構(gòu)橋的發(fā)展歷程及受力特點(diǎn)，并系統(tǒng)闡述了橋梁結(jié)構(gòu)試驗(yàn)檢測(cè)的相關(guān)知識(shí)。以西蘇角特大橋?yàn)橐劳泄こ�，從工程�?shí)際出發(fā)建立三維空間有限元模型，并結(jié)合靜載試驗(yàn)對(duì)橋梁在車(chē)道荷載作用下內(nèi)力進(jìn)行分析；結(jié)合依托工程在邊跨布置永久壓重混凝土的工程實(shí)際，分析了壓重混凝土對(duì)橋梁整體線(xiàn)形的影響，提出了對(duì)設(shè)計(jì)壓重集度適當(dāng)增大范圍的建議。 根據(jù)結(jié)構(gòu)動(dòng)力特性計(jì)算理論，采用子空間迭代法求解動(dòng)力方程特征值及特征向量，計(jì)算出結(jié)構(gòu)的自振模態(tài)；以依托工程的結(jié)構(gòu)振型和頻率，詳細(xì)分析了高墩大跨連續(xù)剛構(gòu)橋的各項(xiàng)動(dòng)力特性，為今后此類(lèi)橋梁的設(shè)計(jì)、施工以及運(yùn)營(yíng)管養(yǎng)提供參考；采用MIDAS/Civil移動(dòng)荷載時(shí)程分析模塊，自定義車(chē)輛移動(dòng)荷載時(shí)程函數(shù)，對(duì)不同車(chē)速下結(jié)構(gòu)的動(dòng)力響應(yīng)進(jìn)行分析，提取了不同車(chē)速下橋梁中跨跨中節(jié)點(diǎn)的位移時(shí)程數(shù)據(jù)，分析得出了車(chē)速與連續(xù)剛構(gòu)橋的動(dòng)力系數(shù)之間的變化規(guī)律。 簡(jiǎn)要介紹了橋梁結(jié)構(gòu)荷載試驗(yàn)的相關(guān)理論；結(jié)合相關(guān)理論及有限元分析結(jié)果，制定試驗(yàn)方案，包括試驗(yàn)橋跨、控制截面、加載工況及車(chē)輛布載等，，按照試驗(yàn)方案實(shí)施加載并對(duì)相關(guān)數(shù)據(jù)進(jìn)行采集，通過(guò)與計(jì)算值對(duì)比得出校驗(yàn)系數(shù)，利用校驗(yàn)系數(shù)結(jié)合規(guī)范對(duì)橋梁的實(shí)際承載能力進(jìn)行評(píng)價(jià)。 采用車(chē)輛荷載對(duì)橋跨進(jìn)行跑車(chē)、剎車(chē)、跳車(chē)試驗(yàn)以及脈動(dòng)試驗(yàn)，對(duì)結(jié)構(gòu)動(dòng)力特性及動(dòng)力響應(yīng)進(jìn)行測(cè)試，與通過(guò)有限元模型得出的結(jié)構(gòu)豎向振型和頻率進(jìn)行對(duì)比，判定橋梁結(jié)構(gòu)的動(dòng)力特性是否正常，同時(shí)根據(jù)動(dòng)載試驗(yàn)實(shí)測(cè)數(shù)據(jù)計(jì)算出結(jié)構(gòu)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(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.23;U441

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