大跨径单索面组合梁斜拉桥钢塔施工关键技术研究

发布时间：2018-01-07 05:18

本文关键词：大跨径单索面组合梁斜拉桥钢塔施工关键技术研究　出处：《石家庄铁道大学》2014年硕士论文　论文类型：学位论文

【摘要】：大跨径钢混组合梁斜拉桥由于其结构新颖、造型美观而在国内得到较快的发展。本论文研究的背景工程是目前世界上在建的投资规模最大的跨海大桥港珠澳大桥工程项目。根据港珠澳大桥工程九洲航道桥的技术和结构特点,特针对本桥大跨径钢混组合梁斜拉桥上部结构的关键问题展开专项施工技术研究,特别是九洲航道桥的主塔施工由于受航空限高影响,上塔柱不能采用常规的节段拼装方案,而采用“大节段吊装+竖转”的组合方案。本文通过结构分析对该施工工艺全过程进行分析,利用有限元软件MIDAS/civil建立模型,根据规范确定荷载组合,验算主塔施工过程中主要施工临时结构的应力与线形,对主塔施工过程中的受力、温变、竖转施工等进行仿真分析,为索塔结构施工控制提供参考依据。此外,为明确主塔竖转施工的受力状态,采用MIDAS软件建立模型,分七种工况对竖转架和钢塔进行受力分析计算。钢塔及曲臂采用梁单元模拟,竖转架压杆采用梁单元模拟,且与钢塔连接端释放转动自由度。压杆连接系采用梁单元,拉杆用杆单元模拟。并将计算结果与原设计采用的施工工艺进行了对比,为同类型大跨径斜拉桥索塔的设计与施工提供部分参考依据。同时为确保九洲航道桥主塔的线形及内力满足设计要求,特在精确仿真分析计算的基础上,结合现场实测数据,对钢塔的施工过程进行严格控制。在施工期间对结构线形、索力、应力等内容进行有效的控制与调整,保证该塔在竖转及成塔时线形、索力及应力与设计目标基本吻合。
[Abstract]:The long-span steel-concrete composite girder cable-stayed bridge is novel in structure. The background project studied in this paper is the largest investment project in the world at present. According to the project of Jiuzhou waterway bridge of HongKong-Zhuhai-Macao bridge. Technical and structural characteristics. Special construction technology research is carried out in view of the key problems of the superstructure of the long-span steel-concrete composite beam cable-stayed bridge, especially the main tower construction of Jiuzhou Waterway Bridge is affected by the aeronautical limit height. The upper tower column can not adopt the conventional segmental assembly scheme, but the combination scheme of "large segment hoisting vertical rotation". This paper analyzes the whole process of the construction technology through structural analysis. The finite element software MIDAS/civil is used to establish the model, to determine the load combination according to the code, to check and calculate the stress and linear shape of the main temporary construction structure during the construction of the main tower, and to force the main tower during the construction process. The simulation analysis of temperature variation and vertical construction provides a reference for the construction control of cable tower structure. In addition, in order to clarify the stress state of the main tower vertical construction, the model is established by MIDAS software. The steel tower and curved arm are simulated by beam element, and the compression bar of vertical rotation frame is simulated by beam element. And with the steel tower connection end release rotational freedom, compression bar connection system using beam element, tension bar bar element simulation, and the calculation results are compared with the original design of the construction technology. For the same type of long-span cable-stayed bridge cable tower design and construction to provide some reference, and to ensure that the main tower of Jiuzhou waterway bridge line and internal force to meet the design requirements, especially on the basis of accurate simulation analysis and calculation. The construction process of the steel tower is strictly controlled in combination with the field measured data. The structural alignment, cable force and stress are effectively controlled and adjusted during the construction period to ensure the alignment of the tower during vertical rotation and tower formation. The cable force and stress are in good agreement with the design objective.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

【相似文献】