钢箱梁顶推施工安全性分析

发布时间：2018-01-13 17:11

本文关键词：钢箱梁顶推施工安全性分析　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：随着铁路线路的不断扩建,跨越既有线的情况越来越多。顶推施工是跨越既有线的新线桥梁常用的施工方法。本文主要对钢箱梁顶推施工过程中钢梁和桥墩的受力行为进行了研究,主要内容如下： (1)详细阐述了顶推法的发展应用、顶推施工的工艺特点以及梁体在顶推过程中的受力特点。 (2)采用Midas/Civil模拟钢箱梁结构顶推施工阶段的受力行为,包括钢箱梁的支反力、变形和组合应力的大小和变化规律。检算了模拟拼装平台(包括滑道梁、钢管立柱),分析其内力或应力的大小和规律,以及支架的整体变形。 (3)通过构造简支梁模型,计算了钢箱梁纵向抗倾覆稳定系数,并计算了风荷载影响下的横向抗倾覆系数。 (4)运用有限元分析软件Midas/FEA对钢箱梁进行局部应力分析。通过对主梁墩顶处和托座处梁体的局部受力分析,得出了顶板、底板、腹板、加劲肋和横隔板应力最大值及其位置。 (5)运用大型有限元软件ANSYS模拟,分析了桥墩在水平摩擦力作用下的受力性能。
[Abstract]:Abstract: with the continuous expansion of the railway line, crossing the existing situation more and more. Pushing construction is the construction method of new bridges across existing lines. This paper focuses on the steel beam and steel box girder pier jacking construction process stress behavior was studied. The main contents are as follows:
(1) the development and application of the push method, the technological characteristics of the jacking construction and the stress characteristics of the beam body during the pushing process are described in detail.
(2) Midas/Civil was used to simulate the steel box girder jacking construction stage of the mechanical behavior of steel box girder, including the force, deformation and combination of size and variation of stress. The calculated simulation assembly platform (including slide beam, steel column), the size and regularity of the internal force or stress, and support the deformation of the whole.
(3) through the construction of simple supported beam model, the longitudinal anti overturning stability coefficient of steel box girder is calculated, and the lateral anti overturning coefficient under the influence of wind load is calculated.
(4) using finite element analysis software Midas/FEA to the local stress analysis of steel box girder. Through the analysis of local force of main girder pier roof and bracket beam at the body, the roof, floor, web stiffeners and diaphragms, the maximum stress and its position.
(5) the large finite element software ANSYS simulation is used to analyze the force performance of the pier under the action of horizontal friction.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.213

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