【摘要】：隨著我國公路交通量的增加，大型超重車輛的增多，毛勒伸縮裝置是目前運用十分普遍的一種大位移量伸縮裝置。伸縮縫在大的交通壓力下引起結構失效從而導致行車不舒適、橋梁結構的損傷等問題。疲勞破壞是毛勒式伸縮裝置病害的主要原因之一。對毛勒式橋梁伸縮裝置的疲勞破壞原因進行分析，，給出相應的養(yǎng)護措施，對于保證行車舒適性、保證橋梁結構的安全性和耐久性具有重要作用。本文以湘潭三大橋毛勒式伸縮裝置為例，通過實驗和理論研究，對該毛勒伸縮裝置進行了疲勞壽命估算，提出了影響其疲勞壽命的因素。 基于依據(jù)橋梁伸縮裝置相關設計規(guī)范、疲勞計算理論等，研究毛勒式伸縮縫的動力特性。結合實橋動應力測試試驗，研究橋梁伸縮裝置在給定軸重、車速的車輛通過時的動應力情況。得到車輛荷載作用下的應力譜。建立橋梁伸縮裝置的有限元模型，分析橋梁伸縮裝置在給定不同的時程荷載情況下的應力時程，并給出其隨車速不同的應力變化規(guī)律；分析伸縮裝置受力情況的影響因素，主要包括壓緊支承、彈性支承彈性模量變化對伸縮縫應力的影響；給出在同一車速情況下，隨著剛度不同，伸縮縫應力的變化情況；研究各個部分阻尼對伸縮縫在車輛通行時中梁應力大小的影響。根據(jù)實際的測試數(shù)據(jù)以及理論分析數(shù)據(jù)，考慮該伸縮縫實際存在的各個方面的影響因素，運用疲勞壽命的相關理論分析該毛勒伸縮縫的疲勞壽命。根據(jù)研究成果，提出了與毛勒式伸縮縫養(yǎng)護、設計相關的建議，對提高毛勒式伸縮縫的使用壽命具有實際意義。
[Abstract]:With the increase of highway traffic volume and the increase of large and overweight vehicles, Muller telescopic device is a kind of large displacement telescopic device which is widely used at present. Expansion joint causes structural failure under heavy traffic pressure, which leads to uncomfortable driving and damage of bridge structure. Fatigue failure is one of the main causes of disease of Muller telescopic device. The cause of fatigue failure of Maoller type bridge telescopic device is analyzed, and the corresponding maintenance measures are given, which play an important role in ensuring driving comfort and ensuring the safety and durability of bridge structure. In this paper, the fatigue life of the Maule telescopic device of Xiangtan third Bridge is estimated through experimental and theoretical research, and the factors influencing its fatigue life are put forward. Based on the design code of bridge expansion device and fatigue calculation theory, the dynamic characteristics of Mowler expansion joint are studied. Based on the dynamic stress test of real bridge, the dynamic stress of a vehicle with given axle load and speed is studied. The stress spectrum under vehicle load is obtained. The finite element model of bridge telescopic device is established, the stress time history of bridge telescopic device under given time history load is analyzed, and the law of stress variation with different speed is given. The influence of elastic modulus change of elastic support on the stress of expansion joint is given, and the variation of stress of expansion joint with different stiffness is given under the condition of the same speed. The effect of damping on the stress of the middle beam of the expansion joint is studied. According to the actual test data and the theoretical analysis data, the fatigue life of the wool expansion joint is analyzed by using the theory of fatigue life, considering the factors affecting the actual existence of the expansion joint. On the basis of the research results, some suggestions related to the maintenance and design of the wool expansion joint are put forward, which are of practical significance for improving the service life of the wool expansion joint.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U443.31

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