独塔斜拉桥空间施工控制方法与应用研究

发布时间：2018-07-18 14:35

【摘要】：随着交通流量的猛增,桥梁宽度越来越大,桥梁施工过程中空间问题越来越突出,桥梁施工监控需要由以往的杆系结构分析向空间实体分析转变,以确保施工过程中桥梁的安全。本文以浙江省湖州市创业大桥为研究背景,通过大量理论分析与研究,形成了一套简便可行的独塔斜拉桥施工控制方法,验证了该独塔斜拉桥空间施工控制方法的可行性。全文主要研究内容如下:(1)运用有限元分析软件Midas Civil建立了全桥整体杆系模型,分析了最大悬臂状态及成桥状态这两个主要施工阶段和成桥后荷载组合作用下的主梁、索塔和斜拉索的内力、应力和变形情况,计算结果表明该桥的受力和变形都满足规范要求。(2)运用有限元软件Midas Fea建立了0号块、主梁2.5m肋宽标准节段、主梁2.0m肋宽标准节段以及锚跨压重段四个代表性主梁节段的空间实体模型,分析了施工过程中最大悬臂阶段及成桥阶段下各个节段的空间应力分布情况。(3)通过对实体单元与梁单元模型的纵向正应力结果进行对比,得出应力变化规律,并对主梁截面纵向应力测点的布置进行了优化。结合目前所常用的施工控制方法,提出了一套适用于独塔斜拉桥的施工监控方案。(4)根据创业大桥主桥施工过程主梁应力理论值与实测值的比较分析,验证了该施工控制方法的准确性。
[Abstract]:With the rapid increase of traffic flow, the width of the bridge becomes larger and larger, and the spatial problems in the process of bridge construction become more and more prominent. The monitoring of bridge construction needs to change from the previous analysis of the bar structure to the analysis of the spatial entity. To ensure the safety of the bridge during construction. In this paper, a set of simple and feasible construction control method of single-tower cable-stayed bridge is formed through a lot of theoretical analysis and research, and the feasibility of spatial construction control method of single-tower cable-stayed bridge is verified. The main contents of this paper are as follows: (1) the whole bridge member system model is established by using the finite element analysis software Midas Civil, and the main beam under the two main construction stages, the maximum cantilever state and the completed bridge state, and the post-load combination of the bridge are analyzed. The internal force, stress and deformation of the cable tower and cable are calculated, and the results show that the stress and deformation of the bridge meet the requirements of the code. (2) A standard section of block 0 with 2.5m rib width of the main beam is established by using the finite element software Midas Fea. The spatial solid model of four typical segments of main beam with 2.0 m rib width and four typical segments of anchor span, The spatial stress distribution of each segment in the maximum cantilever stage and the bridge stage during construction is analyzed. (3) by comparing the longitudinal normal stress results of the solid element model with the beam element model, the law of stress variation is obtained. The arrangement of longitudinal stress measuring points of main beam section is optimized. Combined with the construction control method commonly used at present, a set of construction monitoring scheme suitable for single tower cable-stayed bridge is put forward. (4) according to the comparison between the theoretical value of the main girder and the measured value during the construction process of the main bridge, The accuracy of the construction control method is verified.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4;U448.27

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