三塔钢箱—钢桁叠合梁斜拉桥车桥系统耦合振动研究
发布时间：2019-06-27 15:27
【摘要】：摘要：钢主梁斜拉桥常用的主梁形式有钢箱梁和钢桁梁,将两者相结合不仅保证了主梁整体刚度,而且施工作业方便、施工进度较快。铁路斜拉桥因所受荷载大、结构轻柔,车桥耦合振动问题较为突出,对刚度的要求较高。而刚度参数的确定是斜拉桥设计的重要部分,对这种新型主梁形式斜拉桥尤为重要。本文工作依托国家自然科学基金项目“强风环境下高速铁路车-桥系统气动特性和抗倾覆性能风洞试验研究(51178471)”,结合洞庭湖三塔钢箱-钢桁叠合梁斜拉桥工程实例,主要完成内容和结论如下： (1)针对三塔钢箱-钢桁叠合梁斜拉桥的结构特点,建立了车桥系统动力学仿真分析与精细化计算模型,利用该模型进行动力特性计算与分析,结果表明桥梁基频为横向振动模态,振型较为密集,且模态呈现出较强的耦合性。 (2)利用上述精细化分析模型对洞庭湖三塔钢箱-钢桁叠合梁斜拉桥原设计方案进行车桥系统动力学仿真计算与研究,结果表明：当列车以设计速度过桥时具有足够的安全性和舒适性。 (3)研究了不同桁宽、桁高、稳定索刚度、中塔刚度和二期恒载等刚度敏感参数对洞庭湖三塔钢箱-钢桁叠合梁斜拉桥的自振特性及车桥动力响应的变化规律,分析结果表明：钢箱-钢桁叠合梁桁宽的增加能够显著增大桥梁横向基频,且能减小跨中横向振动响应；增大钢箱-钢桁叠合梁桁高、提高中塔刚度和稳定索刚度均能显著减小桥梁跨中竖向振动位移；二期恒载的变化对桥梁的横、竖向刚度的影响规律不明显。
[Abstract]:Abstract: The main beam of the main girder of the steel girder cable-stayed bridge has the steel box girder and the steel beam, and the combination of the two is not only the overall rigidity of the main beam, but also the construction operation is convenient and the construction progress is fast. The railway cable-stayed bridge has the advantages of large load, soft structure, and high coupling vibration of the axle, and the requirement for rigidity is high. The determination of the stiffness parameter is an important part of the design of the cable-stayed bridge. Based on the project "Wind tunnel test study on aerodynamic characteristics and anti-overturning performance of high-speed railway vehicle-bridge system under strong wind environment (51178471)" of the National Natural Science Foundation of China, the main contents and conclusions of the project are as follows: (1) For the structure of the three-tower steel box-steel corrugated composite beam cable-stayed bridge The results show that the fundamental frequency of the bridge is the transverse vibration mode, the vibration mode is relatively dense, and the modal presents a strong coupling. (2) Using the above-mentioned fine analysis model to calculate and study the dynamic simulation of the axle system for the original design scheme of the three-tower steel box-steel double-beam cable-stayed bridge of the Dongting Lake, the results show that when the train passes through the bridge with the design speed, it has sufficient safety and safety. The natural vibration and dynamic response of the cable-stayed bridge of the three-tower steel box-steel-reinforced composite beam-stayed bridge of Dongting Lake were studied by using the stiffness-sensitive parameters such as wide-width, high-strength, stable cable stiffness, middle tower stiffness and second-phase constant load. The results show that the increase of the width of the steel box-steel composite beam can significantly increase the transverse fundamental frequency of the bridge and reduce the lateral vibration response of the bridge. the influence of the change of the second phase and the second phase on the transverse and vertical stiffness of the bridge
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U448.27
本文编号：2506914
[Abstract]:Abstract: The main beam of the main girder of the steel girder cable-stayed bridge has the steel box girder and the steel beam, and the combination of the two is not only the overall rigidity of the main beam, but also the construction operation is convenient and the construction progress is fast. The railway cable-stayed bridge has the advantages of large load, soft structure, and high coupling vibration of the axle, and the requirement for rigidity is high. The determination of the stiffness parameter is an important part of the design of the cable-stayed bridge. Based on the project "Wind tunnel test study on aerodynamic characteristics and anti-overturning performance of high-speed railway vehicle-bridge system under strong wind environment (51178471)" of the National Natural Science Foundation of China, the main contents and conclusions of the project are as follows: (1) For the structure of the three-tower steel box-steel corrugated composite beam cable-stayed bridge The results show that the fundamental frequency of the bridge is the transverse vibration mode, the vibration mode is relatively dense, and the modal presents a strong coupling. (2) Using the above-mentioned fine analysis model to calculate and study the dynamic simulation of the axle system for the original design scheme of the three-tower steel box-steel double-beam cable-stayed bridge of the Dongting Lake, the results show that when the train passes through the bridge with the design speed, it has sufficient safety and safety. The natural vibration and dynamic response of the cable-stayed bridge of the three-tower steel box-steel-reinforced composite beam-stayed bridge of Dongting Lake were studied by using the stiffness-sensitive parameters such as wide-width, high-strength, stable cable stiffness, middle tower stiffness and second-phase constant load. The results show that the increase of the width of the steel box-steel composite beam can significantly increase the transverse fundamental frequency of the bridge and reduce the lateral vibration response of the bridge. the influence of the change of the second phase and the second phase on the transverse and vertical stiffness of the bridge
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U448.27
【参考文献】
相关期刊论文 前8条
1 陈淮;曾庆元;;特大钢桁梁桥振动分析[J];长沙铁道学院学报;1990年04期
2 郭文华,曾庆元;高速铁路多跨简支梁桥横向振动随机分析[J];长沙铁道学院学报;1997年01期
3 尹邦武;苗永抗;郭向荣;;斜拉-连续刚构组合梁桥车-桥耦合动力响应分析[J];铁道科学与工程学报;2013年02期
4 尹邦武;杨峰;郭向荣;何旭辉;;温度变形对大跨度钢箱系杆拱桥车桥动力响应的影响[J];铁道科学与工程学报;2013年06期
5 曾庆元,骆宁安,江锋;桥上列车横向摇摆力的初步研究[J];桥梁建设;1990年01期
6 陈亨锦,王凯,李承根;浅谈部分斜拉桥[J];桥梁建设;2002年01期
7 肖海珠;徐伟;高宗余;;安庆铁路长江大桥设计[J];桥梁建设;2009年05期
8 张强;李永乐;邓江涛;向活跃;;桁宽对大跨度铁路斜拉桥车-桥耦合振动性能的影响研究[J];桥梁建设;2012年01期
相关博士学位论文 前1条
1 易伦雄;三塔双主跨双线铁路斜拉桥竖向刚度问题的研究[D];中南大学;2011年
，本文编号：2506914
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2506914.html
