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  本文關鍵詞： 大跨徑連續(xù)剛構橋 長期撓度 健康監(jiān)測 恒載零彎矩　出處：《廣州大學》2014年碩士論文　論文類型：學位論文

【摘要】：自進入19世紀以來，隨著預應力體系的發(fā)展，大跨徑預應力連續(xù)剛構橋以其施工簡便、造價經濟、受力合理、行車舒適等獨特的優(yōu)勢得到了快速發(fā)展。但是，國內外大跨徑預應力連續(xù)剛構橋普遍存在一個問題—跨中過度下?lián)?且普遍沒有建立相應的健康監(jiān)測系統(tǒng)實時對橋梁的運營狀態(tài)進行監(jiān)測評估，導致一些此類橋型出現(xiàn)嚴重病害甚至突然垮塌，，造成了嚴重的經濟損失甚至危機人們的生命財產安全，因此對大橋運營狀態(tài)實時監(jiān)測與長期撓度控制的研究有重大意義。 本文首先以某大橋為工程背景，運用橋梁設計分析軟件midas civil模擬計算其長期撓度，分析對比預應力損失、混凝土收縮徐變計算模式等因素對大跨徑預應力連續(xù)剛構橋跨中長期撓度的影響，分析影響大跨度預應力連續(xù)剛構橋跨中長期撓度各種因素的敏感性。 其次，本文系統(tǒng)介紹了某大橋的健康監(jiān)測系統(tǒng)，包括其工作方式、硬件配置、監(jiān)測系統(tǒng)的安裝等，并通過對該大橋從成橋至今3年的跨中撓度實時監(jiān)測數(shù)據(jù)的收集，把監(jiān)測長期撓度與理論計算值做了比較，分析預應力混凝土連續(xù)剛構橋長期撓度的變化規(guī)律，列舉了該大橋在行車荷載下跨中撓度的跳動規(guī)律，為大橋的安全性評價提供基本依據(jù)，最終為此類橋型的施工、設計、養(yǎng)護等提供依據(jù)。 最后，為主動控制大跨度預應力連續(xù)剛構橋跨中長期下?lián)喜『Γ疚幕诤爿d零彎矩理論，采用頂板預應力控制跨中長期下?lián)戏绞�，使橋體自重產生的正彎矩與預應力產生的負彎矩平衡，達到控制跨中長期下?lián)系哪康模⒅嘏漕A應力束后的跨中位移與原設計作比較分析，驗證恒載零彎矩法在控制大跨徑預應力混凝土連續(xù)剛構橋跨中長期撓度的可行性。
[Abstract]:Since 19th century, with the development of prestressed system, long-span prestressed continuous rigid frame bridge has been developed rapidly with its unique advantages such as simple construction, economical cost, reasonable force, comfortable driving and so on. There is a common problem of long-span prestressed continuous rigid frame bridges at home and abroad-excessive deflection in the span, and there is no corresponding health monitoring system to monitor and evaluate the operation status of the bridge in real time. As a result, some of these bridges appear serious diseases or even suddenly collapse, resulting in serious economic losses or even a threat to the safety of people's lives and property. Therefore, it is of great significance to study the real-time monitoring and long-term deflection control of the bridge. In this paper, the bridge design and analysis software midas civil is used to simulate and calculate the long-term deflection of a bridge, and the loss of prestressing force is analyzed and compared. The influence of concrete shrinkage and creep calculation model on the long-span prestressed continuous rigid frame bridge span deflection is analyzed. The sensitivity of various factors affecting the long-span prestressed continuous rigid frame bridge span deflection is analyzed. Secondly, this paper systematically introduces the health monitoring system of a bridge, including its working mode, hardware configuration, monitoring system installation and so on. Through the collection of the real-time monitoring data of the mid-span deflection of the bridge from the completion of the bridge to three years, the long-term deflection of the bridge is compared with the theoretical calculation value, and the variation law of the long-term deflection of the prestressed concrete continuous rigid frame bridge is analyzed. This paper enumerates the runout rule of the midspan deflection of the bridge under the traffic load, which provides the basic basis for the safety evaluation of the bridge, and finally provides the basis for the construction, design and maintenance of this kind of bridge. Finally, in order to actively control the long-span prestressed continuous rigid frame bridge span mid- and long-term deflection disease, based on the theory of zero moment of dead load, the roof prestressed control method of mid-long term deflection is adopted in this paper. The balance of the positive moment caused by the weight of the bridge body and the negative moment produced by the prestressing force can achieve the purpose of controlling the mid-span deflection in the long term, and the mid-span displacement after the rearrangement of the prestressing beam is compared with the original design. The feasibility of zero-moment dead load method in controlling long-span prestressed concrete continuous rigid frame bridge span deflection is verified.
【學位授予單位】：廣州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U448.23

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