混凝土斜拉桥双主肋式主梁桥面板的空间受力特性分析

发布时间：2018-01-12 20:39

  本文关键词：混凝土斜拉桥双主肋式主梁桥面板的空间受力特性分析　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 混凝土斜拉桥 桥面板 空间受力 板的有效工作宽度 抗裂性能

【摘要】：大跨度预应力混凝土斜拉桥较多地采用双主肋式主梁,其桥面板的受力性能直接影响到整桥的受力性能。在车辆荷载作用下,桥面板受力十分复杂,为了研究双主肋式主梁桥面板的受力性能,本文以贵州六冲河大桥为工程背景,建立了主梁节段空间有限元模型,对桥面板纵向、横向的支点和跨中截面、角隅处在最不利车辆荷载下的内力和应力进行了分析,并进一步探讨了双主肋式主梁桥面板有效分布宽度的计算方法和桥面板的抗裂性能。主要研究工作如下：1)介绍我国混凝土斜拉桥研究概况和发展趋势、混凝土斜拉桥主梁的发展与特点、双主肋截面桥面板的研究现状。对薄板弯曲理论进行论述。2)对混凝土斜拉桥双主肋桥面板的建模方法进行了研究,应用ANSYS软件建立了贵州六冲河大桥主梁桥面板的空间有限元模型,通过影响线布载确定了桥面板纵向、横向支点截面、跨中截面、角隅处的最不利加载位置,并对以上截面在其最不利布载下的内力进行了分析。在纵向支点截面最不利布载下,对桥面板各关键截面的受力性能进行了分析,并对各截面之间的受力进行了对比。3)对桥面板在纵向支点截面最不利车辆布载和纵向、横向跨中截面最不利车辆布载下板的有效宽度进行了计算,并与按照各国规范计算公式的计算结果进行了对比,提出了适应于双主肋桥面板有效宽度的计算公式。对桥面板在汽车荷载作用下的横向拉应力进行了研究,分析了双主肋式桥面板纵向的抗裂性能。
[Abstract]:The long-span prestressed concrete cable-stayed bridge mostly uses the double-main rib main beam, and the performance of the deck slab has a direct impact on the whole bridge's mechanical performance. Under the vehicle load, the load on the deck slab is very complex. In order to study the mechanical behavior of the slab of the main girder bridge with two main ribs, this paper takes the Liuchong River Bridge in Guizhou as the engineering background, and establishes the spatial finite element model of the main girder segment. The longitudinal, transverse fulcrum and the mid-span section of the deck slab are obtained. The internal forces and stresses of the corner under the most unfavorable vehicle loads are analyzed. Furthermore, the calculation method of the effective distribution width of the slab and the crack resistance of the deck slab are discussed. The main research work is as follows: 1) the research situation and the development trend of the concrete cable-stayed bridge in China are introduced. The development and characteristics of the main beam of concrete cable-stayed bridge, the research status of double-rib cross-section deck slab, and the theory of thin plate bending are discussed. 2) the modeling method of double-rib deck slab of concrete cable-stayed bridge is studied. The spatial finite element model of the slab of the main girder bridge of the Liuchong River Bridge in Guizhou is established by using ANSYS software. The longitudinal, transverse fulcrum section and the mid-span section of the deck slab are determined through the influence of the line distribution load. The most unfavorable loading position at the corner and the internal force of the above section under its most unfavorable load are analyzed. Under the most unfavorable load distribution of the longitudinal fulcrum section, the mechanical properties of the key sections of the bridge deck are analyzed. The effective width of the most unfavorable vehicle distribution and longitudinal load of the bridge deck at the longitudinal fulcrum section and the most disadvantageous vehicle distribution under the transverse span mid-section is calculated. 3) the stress between the sections is compared. 3) the effective width of the bridge deck slab under the load of the most disadvantageous vehicle in the longitudinal fulcrum section is calculated. Compared with the calculation results according to the national codes, the calculation formula suitable for the effective width of double-ribbed deck slab is put forward. The transverse tensile stress of bridge deck slab under the action of automobile load is studied. In this paper, the longitudinal crack resistance of double main rib bridge slab is analyzed.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.27
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本文编号：1415916