【作者】 宁云；

【导师】 颜东煌；

【作者基本信息】 长沙理工大学 ， 桥梁与隧道工程， 2006， 硕士

【摘要】 本文以贵州六圭河特大桥(净跨195.0m的RC箱型拱桥)为工程背景,对该桥的施工方法—千斤顶、斜拉扣挂法的特点进行了详细的综述。然后将该桥型跨径增大至300米,采用同样的施工方法,对其在施工阶段和营运阶段的受力性能进行了研究,具体内容有以下几个方面:1.缆索吊装、千斤顶、斜拉扣挂悬拼法是拱桥无支架施施工方法中的一种新方法。该施工方法安全、可靠、合龙精度高、悬拼施工时间短,能够较好地解决拱桥多节段拼装、拱轴线难于控制等问题。本文详细综述了该施工方法的特点,并对新老施工方法进行了详细的对比。2.大跨径RC箱型拱桥发展的潜力巨大,跨径也会随着设计与施工技术的提高而逐渐增大。贵州六圭河特大桥是目前国内采用缆索吊装斜拉扣挂悬拼法施工的箱型拱桥中的最大跨径。本文将该桥型跨径提高到300米,采用APDL参数化语言对该桥的拱轴系数m进行设计,用有限元通用软件ANSYS对其建立模型,分析了该桥在成桥状态下的静力性能。3.大跨径桥梁结构都有一个分阶段施工过程,结构的某些荷载如自重重力,施工荷载等是在施工过程中逐级施加的,每一施工阶段都有可能伴随着徐变发生、边界约束增减和体系转换等。本文采用平面杆系有限元程序BDCMS,对300米跨RC箱型拱桥的施工过程进行正装模拟,探讨了其设计和施工方案的可行性。4.稳定性问题是大跨度拱桥受力性能分析主要问题之一。本文采用有限元通用软件ANSYS分析了300米跨RC箱型拱桥在各主要施工状态和成桥状态下第一类稳定问题。另外,还讨论了风缆刚度对第一类稳定性的影响。更多还原

【Abstract】 In this paper, on the basis of Liuguihe bridge in GuiZhou province, the clear span of which is 195m, the section of which is reinforce concrete box-type, the construction method of jacks and cables is summarized. Then, design a similar type of bridge, the main span of which is up to 300m, the same construction method is also used, the mechanics performance is analyzed in construction phase and service phase, the details are as follows:1. The method of jacks and cables is a new way in construction without support setting. This method is safe, reliability and the degree of closure precision is high and the time expend to build is short. Even more, it can solve the difficulties in the construction controlling of suspending precast segmental cantilever and arch-axial. The different characterize of new and old method is summarized particularly in this thesis.2. The main span of box-type reinforced concrete arch bridge can be increased gradually with the raising of design and construction technology, and this type bridge will have a huge development potential. Presently, the largest span reinforced concrete arch bridge adopting the method with cableway suspending is the background project of this paper. In this thesis, the main span of this type bridge is raised 300m and the arch-axis coefficient was designed by the parametric language of APDL. Then, a model of this bridge is established basing on the ANSYS software. Therefore, the bridge’s static force performance in finished bridge state is analyzed by the ANSYS software expediently.3. Because the process of long-span bridge is phased and some loads, such as deadweight, construction loads, are applied step by step. So creeping, boundary condition changing and system transferring may be occur in each construction phase. The program of BDCMS is used to simulate the whole construction phase in this dissertation and the design and construction project feasibility of this bridge is disussed detailedly.4. The stability problem is important in the research on mechanical performance of large-span arch bridge. The finite element model of RC arch bridge of ANSYS is constructed, which is used to analyze the stability problem of the first kind in the main construction states and the finished bridge state. In addition, the stability of the first kind which is effected by wind-cable is also discussed in the paper.更多还原