现役独柱墩桥梁横向抗倾覆性能分析

发布时间：2018-06-29 13:06

本文选题：独柱墩 + 倾覆轴　；参考：《长安大学》2017年硕士论文

【摘要】：随着城市车流量的日益增加,在超载大货车偏载行驶的情况下,全国已经发生多起独柱墩桥梁整体坍塌事故。本文以实际工程为背景,借助有限元软件Midas建立不同桥梁跨径、桥梁跨数、桥梁曲率半径、中墩支座偏心值来分析独柱墩桥梁最不利倾覆轴线的选取,并得出上述影响因素对独柱墩横向稳定系数的影响规律,同时又对独柱墩纵向单车过桥最大荷载进行了探讨。本文的研究成果对提高已建独柱墩桥梁的使用寿命与安全系数,对桥梁结构安全运营具有重要的理论价值和现实意义。本文主要内容如下:(1)对不同桥型进行理论与模型论证得出:直线桥梁联端外侧支座连线即为桥梁上部结构倾覆轴线;曲线桥梁联端外侧支座连线以外不存在其它中墩支座时,则桥梁两联端外侧支座连线即为唯一的倾覆轴线;曲线桥梁联端外侧支座连线以外存在中墩支座时,则跨中相邻两支座连线为最不利倾覆轴线;(2)通过有限元模型建立不同桥梁跨径、桥梁曲率半径、中墩支座偏心值进行抗倾覆稳定性分析,得出在相同条件下,曲线桥梁随着曲率半径的增大,抗倾覆稳定系数先减小后增大;稳定系数随着跨径的增大而增大;适当增加中墩支座偏心可以增强独柱墩桥梁横向稳定性;(3)借助工程实例进行纵向单车过桥最大荷载分析,为现役独柱墩桥梁运营阶段提供相关借鉴;(4)以略阳互通式立交匝道2号桥为工程背景进行了横向抗倾覆稳定性能与纵向单车过桥最大荷载分析,提出纵向单车限载相关建议。
[Abstract]:With the increasing of urban traffic, there have been many accidents of single pillar pier bridge collapse in the whole country under the condition of overloading and heavy truck driving. In this paper, with the help of the finite element software Midas, different bridge span, bridge span number, bridge curvature radius and eccentric value of middle pier support are established to analyze the selection of the most unfavorable overturning axis of single-column bridge. The influence of the above factors on the lateral stability coefficient of single column pier is obtained, and the maximum load of single column pier longitudinal bridge is also discussed. The research results of this paper have important theoretical value and practical significance for improving the service life and safety factor of the bridge with single column pier and for the safe operation of bridge structure. The main contents of this paper are as follows: (1) the theoretical and model demonstration of different bridge types shows that the line of the lateral support of the connecting end of the straight bridge is the overturning axis of the superstructure of the bridge, and when there is no other support of the middle pier outside the line of the lateral support of the coupling end of the curved bridge, Then the connection of the lateral support of the two ends of the bridge is the only overturning axis, and when there is the support of the middle pier outside the line of the lateral support of the coupling end of the curved bridge, Then the line between the two adjacent supports is the most unfavorable overturning axis. (2) through the finite element model, different bridge span, bridge curvature radius, eccentric value of the middle pier support are analyzed, and the results show that under the same conditions, With the increase of curvature radius, the stability coefficient of curved bridge decreases first and then increases, and the stability coefficient increases with the increase of span. Increasing the eccentricity of the middle pier support can enhance the lateral stability of the bridge with single column pier. (3) the maximum load analysis of the longitudinal single bridge is carried out with the aid of engineering examples. (4) taking the No.2 bridge of Lueyang Interchange ramp as the engineering background, the lateral anti-capsizing stability performance and the maximum load of the longitudinal bridge are analyzed, and the relevant suggestions on the load limit of the longitudinal bicycle are put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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