双联体独塔预应力混凝土斜拉桥极限承载力分析
发布时间：2018-09-03 12:25
【摘要】：双联体独塔预应力混凝土斜拉桥是斜拉桥中的一种独特桥型,继承独塔斜拉桥的经济性、利于施工等优点;在主塔横桥向的双幅联体构造,增加了主塔乃至整个主桥的横向刚度,但是结构体系相对复杂,关于该类结构的安全性研究相对较少,因此对该类型桥梁进行极限承载力分析,具有非常重要意义。论文以一座在建的双联体独塔四索面预应力混凝土斜拉桥为工程背景,采用MIDAS CIVIL分析了该桥施工阶段结构的一类稳定问题,得出该桥型一类稳定特征值的变化规律;同时采用ABAQUS就主要施工阶段(最大双悬臂和最大单悬臂施工阶段)进行了二类稳定分析,且分析了该桥在公路-Ⅰ级和汽车-超20级两种荷载下的结构极限承载力,获得了5中不同布载工况下的结构稳定安全系数,以及相应的可能破坏模式。研究结果表明:该桥在施工阶段稳定性能良好,挂篮非对称加载对结构稳定性影响显著。成桥阶段,在两种设计荷载的各个布载工况下,主桥结构均具有良好的承载能力;大部分布载工况(除边跨辅助墩主梁最大负弯矩工况)下,结构达到极限承载状态时,汽车-超20级荷载荷载下结构安全系数要大于公路-Ⅰ级,按公路-Ⅰ级进行理论模型计算,指导类似汽车-超20级车队布置的运营管理是偏安全的。
[Abstract]:Double pylon prestressed concrete cable-stayed bridge is a unique type of cable-stayed bridge, which inherits the economic and construction advantages of single-tower cable-stayed bridge. The lateral stiffness of the main tower and the whole main bridge is increased, but the structure system is relatively complex, and the research on the safety of this kind of structure is relatively few. Therefore, it is of great significance to analyze the ultimate bearing capacity of this type of bridge. In this paper, based on the engineering background of a two-pylon four-cable plane prestressed concrete cable-stayed bridge under construction, MIDAS CIVIL is used to analyze a kind of stability problem of the bridge structure in the construction stage, and the variation law of the stability eigenvalue of the bridge type is obtained. At the same time, ABAQUS is used to analyze the stability of the main construction stage (maximum double cantilever and maximum single cantilever construction), and the ultimate bearing capacity of the bridge under two kinds of loads of highway class 鈪，
本文编号：2219976
[Abstract]:Double pylon prestressed concrete cable-stayed bridge is a unique type of cable-stayed bridge, which inherits the economic and construction advantages of single-tower cable-stayed bridge. The lateral stiffness of the main tower and the whole main bridge is increased, but the structure system is relatively complex, and the research on the safety of this kind of structure is relatively few. Therefore, it is of great significance to analyze the ultimate bearing capacity of this type of bridge. In this paper, based on the engineering background of a two-pylon four-cable plane prestressed concrete cable-stayed bridge under construction, MIDAS CIVIL is used to analyze a kind of stability problem of the bridge structure in the construction stage, and the variation law of the stability eigenvalue of the bridge type is obtained. At the same time, ABAQUS is used to analyze the stability of the main construction stage (maximum double cantilever and maximum single cantilever construction), and the ultimate bearing capacity of the bridge under two kinds of loads of highway class 鈪，
本文编号：2219976
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