本文關(guān)鍵詞： 山區(qū)高速公路 橋梁 大縱坡 柔性高墩 交接墩 偏位病害 非線性分析 施工監(jiān)控　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來,隨著國家西部大開發(fā)戰(zhàn)略的深入,中西部地區(qū)的高速公路得到了空前發(fā)展。我國西部地區(qū)地形以高原、盆地、山地為主,地質(zhì)條件復(fù)雜。山區(qū)高速公路橋梁平縱線形受地形的影響突出,曲線、大縱坡、高墩成為山區(qū)高速公路橋梁的主要特點。大縱坡柔性高墩連續(xù)梁橋的交接墩偏位病害已在多條山區(qū)高速公路橋梁上出現(xiàn),幾乎成為一種普遍性的病害。目前,國內(nèi)外對這一問題的研究較少,對病害產(chǎn)生的原因觀點不一,對病害產(chǎn)生后的處治方法研究也較少。本文以某高速公路上出現(xiàn)該種病害的紅陽大橋為背景,對交接墩偏位病害產(chǎn)生的原因、病害橋墩的安全性、偏位橋墩的糾偏施工及監(jiān)控等關(guān)鍵技術(shù)進行了較深入研究。首先建立全橋有限元模型,按簡支梁體系、簡支轉(zhuǎn)換連續(xù)梁、施工車輛通行三個階段對偏位病害形成過程進行了分析。結(jié)果表明：支座安裝不水平是導(dǎo)致橋墩偏位的根本原因,上部結(jié)構(gòu)恒載、活載和溫度荷載等作用在不水平支座上,造成或加劇橋墩偏位。為研究橋墩偏位對橋梁結(jié)構(gòu)性能的影響,編制了橋墩受力性能的非線性全過程分析程序,對偏位狀態(tài)下橋墩的受力變形狀態(tài)進行了評估,對偏位橋墩的抗壓承載能力進行了分析,對偏位橋墩糾偏完成和加固后的抗推承載能力進行了驗算。從病害處治的角度出發(fā),對紅陽大橋橋墩予以糾偏和加固并進行全過程施工監(jiān)控,對糾偏和加固后橋墩的狀態(tài)分別進行了連續(xù)觀測和長期監(jiān)測。糾偏過程中,上部結(jié)構(gòu)基本保持靜止狀態(tài),橋墩受力均勻,結(jié)構(gòu)安全；糾偏后糾偏橋墩豎直度和伸縮縫寬度都隨溫度周期性變化,橋墩及支座的工作狀態(tài)良好,橋墩糾偏和加固取得了良好的效果。通過對紅陽大橋交接墩偏位成因分析、橋墩受力性能非線性分析及橋墩糾偏施工監(jiān)控,分析了大縱坡連續(xù)梁橋柔性高墩偏位病害的主要原因及其對結(jié)構(gòu)受力性能的影響,獲得了有價值的研究結(jié)論,并提出了有效的處治方法和建議,可供類似工程病害處治參考。
[Abstract]:In recent years, with the development of the national western development strategy, the highway in the central and western regions has been unprecedented development. The topography of the western region of China is mainly plateau, basin and mountain. The geological conditions are complex. The horizontal and vertical lines of highway bridges in mountainous areas are influenced by the topography, the curves and the large vertical slopes. High piers have become the main characteristics of highway bridges in mountainous areas. The bridge with large longitudinal slope flexible high pier continuous beam bridge has appeared on many mountain highway bridges and has almost become a universal disease. There are few researches on this problem at home and abroad, different views on the causes of the disease, and less research on the treatment methods after the disease. The background of this paper is the Hongyang Bridge, where the disease occurs on a certain expressway. In this paper, the causes of the defect of the bridge bridge pier, the safety of the bridge pier, the construction and monitoring of the bridge pier are studied deeply. Firstly, the finite element model of the bridge is established, and the system of simply supported beam is established. The formation process of the deflection disease is analyzed in the three stages of simply supported transfer continuous beam and construction vehicle. The results show that the non-horizontal support installation is the fundamental cause of the bridge pier deviation and the superstructure is dead. The effects of live load and temperature load on the unhorizontal support cause or aggravate the deflection of the pier. In order to study the influence of the deflection of the pier on the performance of the bridge structure, a nonlinear full-process analysis program for the mechanical behavior of the pier is developed. The stress and deformation state of the pier is evaluated and the bearing capacity of the eccentric pier is analyzed. The anti-pushing capacity of the bridge pier after rectifying and strengthening is checked and calculated. From the point of view of disease treatment, the bridge pier of Hongyang Bridge is rectified and strengthened, and the whole process construction monitoring is carried out. Continuous observation and long-term monitoring of the state of the bridge pier after rectifying and strengthening are carried out. In the process of rectifying deviation, the superstructure basically remains static, the force of the pier is uniform, and the structure is safe. After rectifying the deviation, the vertical degree and the width of the expansion joint change periodically with the temperature, and the working condition of the pier and the support is good. The bridge pier deviation correction and reinforcement have achieved good results. Through the analysis of the causes of bridge pier deflection, the nonlinear analysis of pier force performance and the monitoring of bridge pier deviation correction construction. This paper analyzes the main causes of the deflection disease of flexible high piers of large longitudinal slope continuous girder bridge and its influence on the mechanical performance of the structure, obtains valuable research conclusions, and puts forward effective treatment methods and suggestions. It can be used as a reference for the treatment of similar engineering diseases.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.71

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