【作者】 邹先权；

【导师】 李亚东； 刘怀林；

【作者基本信息】 西南交通大学 ， 建筑与土木工程， 2008， 硕士

【摘要】 钢管混凝土拱桥是我国近年来桥梁建筑发展的新技术,具有自重轻、强度大、抗变形能力强的优点。它较好地综合满足了修建桥梁所需求的用料省、安装重量轻、施工简便、承重能力大的诸多要求,是大跨度拱桥的一种比较理想的结构形式。国外关于钢管混凝土结构的研究与应用已有近百年的历史,而国内则是从20世纪50年代开始研究,进入90年代以来,钢管混凝土作为一种新型的组合材料,由于其力学性能非常适合拱式结构,所以在桥梁工程领域得到广泛应用和迅猛发展。本文主要研究大跨度钢管混凝土拱桥的缆索扣吊系统的设计方法和以扣索索力与拱肋线形为目标的施工控制技术,主要内容如下:1、从介绍拱桥的施工方法入手,简要分析了各种施工方法与适用范围,并指出钢管混凝土应用于拱桥向大跨度发展的施工问题。钢管混凝土拱桥施工方法实质上是劲性骨架方法和自架设方法。着重介绍了钢管骨架架设方法中的两种主要方法:缆索吊装法和转体施工法。2、从小河大桥(主跨338m的上承式钢管混凝土拱桥)的主拱吊装方案设计着手,对缆索扣吊系统的缆索系统、塔架以及风缆等的设计和检算方法进行了探讨,确保吊装施工过程安全可靠。3、以小河大桥为工程背景,借助ANSYS分析程序,将优化理论和有限元方法引入到钢管混凝土拱桥拱肋架设扣索索力调整计算,这样计算出的索力精度较高,既能确保结构的受力状态和变形始终处在安全范围内,又能保证架设和调整后的拱肋线形符合设计期望。更多还原

【Abstract】 In our country, concrete-filled steel tubular (CFST) arch bridges have become a new technology of the bridge construction in recent years. It has the merits of light deadweight, great strength and strong distortion-resistant capacity. It can preferably satisfy requirements such as less materials, light erection weight, simple construction, and great bearing capacity. It is a kind of more ideal structure form for long-span arch bridges.The researches and applications about CFST structure have been taken about one hundred years in the world. But in China the researches have been taken since 1950s. Since 1990s, as a new-style combined material with favourable mechanical behaviour fit for arch bridges, CFST has been getting broad application and rapid development. The research in this thesis is concentrated on the design of the cable suspending-fastening system and construction control of fastening-cable forces and arch ring’s shape for CFST long-span arch bridges. The main contents are summarized as follow:1. Starting with the introduction of erection methods of arch bridges, different erection methods and their applicability are analyzed briefly. Accordingly, construction issues are pointed out when using CFST for long-span arch bridges. The erection methods of CFST arch bridges are substantially the rigid skeleton method and the self-spanning method. Two main methods of the cable crane-assembly method and the rotation method forming span of steel tube skeleton are emphasized.2. Based on the construction of the Xiaohe Bridge, a deck CFST arch bridge with main span of 338m, the design, calculation and construction method for cable crane system, main pylon system, fasten and hang system are introduced respectively in this thesis.3. On the project background of the Xiaohe Bridge, the optimizing theory and the FEM method are applied to the calculation of the fastening-cable forces in the process of craning construction of the steel-tube arch segment and construction error adjusting. The calculated optimum cable forces with high precision can guarantee the inner forces and the structure deformation in safe state, and ensure the line shape of the arch ring in accordance with design requirements as well.更多还原