列车荷载作用下中承式拱桥吊杆动力响应研究
发布时间：2019-02-26 13:31
【摘要】：中承式钢管混凝土拱桥的刚度较大、结构轻盈,在车辆荷载的作用下桥梁动力响应明显,尤其对于大跨度的铁路拱桥,一些高强度材料的使用使得桥跨结构的一些构件较为纤细,荷载作用下的局部振动的不断累积导致局部构件的损伤,因此车辆通过时引起的局部振动问题不容忽视。本文以某主跨202m中承式钢管混凝土拱桥为工程背景,建立精细的全桥空间有限元动力分析模型,采用车-线-桥耦合振动分析理论对车辆荷载作用下的吊杆的动力响应进行分析,研究了吊杆局部的动力行为。论文首先简要介绍了铁路拱桥主要的结构形式以及在国内外的发展状况,接着阐述了吊杆局部振动的计算理论及计算方法,根据该中承式拱桥的工程背景及具体的结构设计参数,详细叙述了全桥空间有限元动力分析模型的建立。根据所建立的动力分析模型,对吊杆在运营状态下的动轴力响应、动弯矩响应进行分析。研究发现在车辆运行条件下吊杆的长度越小其对车辆活载的敏感性越强；随着行车速度的增大,短吊杆的活载应力幅逐渐增大,跨中长吊杆应力幅略有增加,但总体变化不大。柔性吊杆也具有一定的抗弯刚度,吊杆内的次弯矩引起截面应力分布不均匀,明显增大活载应力幅；从吊杆的内力响应情况看来,车辆的加载频率对吊杆动轴力的影响较小,对次弯矩的影响较大。动力系数是用来描述车辆荷载对桥梁的动力作用,通过对吊杆在车辆活载作用下的动力效应分析发现,吊杆局部的动力系数明显高于按主梁动挠度计算的结构整体的动力系数,吊杆的动力系数存在明显的局部性。采用车-线-桥耦合振动分析理论对车辆荷载作用下的吊杆的动力响应进行分析,可以得到吊杆运营时的较为真实的动力行为,其计算结果不仅可以为吊杆的疲劳设计提供参考,也可以在成桥运营时规范车辆的运行,减小桥梁的损伤。
[Abstract]:The concrete-filled steel tube arch bridge has large stiffness and light structure, and the dynamic response of the bridge is obvious under the action of vehicle load, especially for the long-span railway arch bridge. The use of some high-strength materials makes some members of the bridge span structure thinner. The continuous accumulation of local vibration under load results in the damage of local members. Therefore, the local vibration caused by vehicle passing can not be ignored. In this paper, based on the engineering background of a 202m concrete-filled steel tube arch bridge with main span, a fine spatial finite element dynamic analysis model of the whole bridge is established. The dynamic response of the hanger under vehicle load is analyzed by using the coupled vibration analysis theory of vehicle-line-bridge, and the local dynamic behavior of the hanger is studied. In this paper, the main structural forms of railway arch bridge and its development at home and abroad are briefly introduced, and then the calculation theory and method of local vibration of hanger are described. According to the engineering background and concrete structural design parameters of the middle-through arch bridge, the establishment of the spatial finite element dynamic analysis model of the whole bridge is described in detail. According to the established dynamic analysis model, the dynamic axial force response and dynamic bending moment response of the hanger under operating conditions are analyzed. It is found that the smaller the length of the hanger is, the stronger the sensitivity to the live load of the vehicle is, and with the increase of the driving speed, the live stress amplitude of the short hanger increases gradually, and the stress amplitude of the mid-long span hanger increases slightly, but the overall variation is little. The flexible hanger also has a certain bending stiffness, the secondary bending moment in the hanger results in uneven distribution of the cross-section stress, and obviously increases the stress amplitude of the live load. It can be seen from the internal force response of the hanger that the loading frequency of the vehicle has little effect on the dynamic axial force of the hanger and a greater influence on the secondary bending moment. The dynamic coefficient is used to describe the dynamic effect of the vehicle load on the bridge. Through the analysis of the dynamic effect of the hanger under the live load of the vehicle, it is found that the local dynamic coefficient of the hanger is obviously higher than the overall dynamic coefficient of the structure calculated according to the dynamic deflection of the main beam. The dynamic coefficient of the hanger has obvious locality. By using the coupled vibration analysis theory of vehicle-line-bridge, the dynamic response of the hanger under vehicle load can be analyzed, and the real dynamic behavior of the hanger can be obtained. The calculated results can not only provide a reference for the fatigue design of the hanger, but also regulate the operation of the vehicle when the bridge is completed and reduce the damage of the bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.22
本文编号：2430819
[Abstract]:The concrete-filled steel tube arch bridge has large stiffness and light structure, and the dynamic response of the bridge is obvious under the action of vehicle load, especially for the long-span railway arch bridge. The use of some high-strength materials makes some members of the bridge span structure thinner. The continuous accumulation of local vibration under load results in the damage of local members. Therefore, the local vibration caused by vehicle passing can not be ignored. In this paper, based on the engineering background of a 202m concrete-filled steel tube arch bridge with main span, a fine spatial finite element dynamic analysis model of the whole bridge is established. The dynamic response of the hanger under vehicle load is analyzed by using the coupled vibration analysis theory of vehicle-line-bridge, and the local dynamic behavior of the hanger is studied. In this paper, the main structural forms of railway arch bridge and its development at home and abroad are briefly introduced, and then the calculation theory and method of local vibration of hanger are described. According to the engineering background and concrete structural design parameters of the middle-through arch bridge, the establishment of the spatial finite element dynamic analysis model of the whole bridge is described in detail. According to the established dynamic analysis model, the dynamic axial force response and dynamic bending moment response of the hanger under operating conditions are analyzed. It is found that the smaller the length of the hanger is, the stronger the sensitivity to the live load of the vehicle is, and with the increase of the driving speed, the live stress amplitude of the short hanger increases gradually, and the stress amplitude of the mid-long span hanger increases slightly, but the overall variation is little. The flexible hanger also has a certain bending stiffness, the secondary bending moment in the hanger results in uneven distribution of the cross-section stress, and obviously increases the stress amplitude of the live load. It can be seen from the internal force response of the hanger that the loading frequency of the vehicle has little effect on the dynamic axial force of the hanger and a greater influence on the secondary bending moment. The dynamic coefficient is used to describe the dynamic effect of the vehicle load on the bridge. Through the analysis of the dynamic effect of the hanger under the live load of the vehicle, it is found that the local dynamic coefficient of the hanger is obviously higher than the overall dynamic coefficient of the structure calculated according to the dynamic deflection of the main beam. The dynamic coefficient of the hanger has obvious locality. By using the coupled vibration analysis theory of vehicle-line-bridge, the dynamic response of the hanger under vehicle load can be analyzed, and the real dynamic behavior of the hanger can be obtained. The calculated results can not only provide a reference for the fatigue design of the hanger, but also regulate the operation of the vehicle when the bridge is completed and reduce the damage of the bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.22
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