毛勒式桥梁伸缩装置的疲劳破坏分析及寿命估算
发布时间：2018-08-16 08:18
【摘要】：随着我国公路交通量的增加，大型超重车辆的增多，毛勒伸缩装置是目前运用十分普遍的一种大位移量伸缩装置。伸缩缝在大的交通压力下引起结构失效从而导致行车不舒适、桥梁结构的损伤等问题。疲劳破坏是毛勒式伸缩装置病害的主要原因之一。对毛勒式桥梁伸缩装置的疲劳破坏原因进行分析，，给出相应的养护措施，对于保证行车舒适性、保证桥梁结构的安全性和耐久性具有重要作用。本文以湘潭三大桥毛勒式伸缩装置为例，通过实验和理论研究，对该毛勒伸缩装置进行了疲劳寿命估算，提出了影响其疲劳寿命的因素。 基于依据桥梁伸缩装置相关设计规范、疲劳计算理论等，研究毛勒式伸缩缝的动力特性。结合实桥动应力测试试验，研究桥梁伸缩装置在给定轴重、车速的车辆通过时的动应力情况。得到车辆荷载作用下的应力谱。建立桥梁伸缩装置的有限元模型，分析桥梁伸缩装置在给定不同的时程荷载情况下的应力时程，并给出其随车速不同的应力变化规律；分析伸缩装置受力情况的影响因素，主要包括压紧支承、弹性支承弹性模量变化对伸缩缝应力的影响；给出在同一车速情况下，随着刚度不同，伸缩缝应力的变化情况；研究各个部分阻尼对伸缩缝在车辆通行时中梁应力大小的影响。根据实际的测试数据以及理论分析数据，考虑该伸缩缝实际存在的各个方面的影响因素，运用疲劳寿命的相关理论分析该毛勒伸缩缝的疲劳寿命。根据研究成果，提出了与毛勒式伸缩缝养护、设计相关的建议，对提高毛勒式伸缩缝的使用寿命具有实际意义。
[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.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.31
本文编号：2185424
[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.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.31
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