【作者】 林荣安；

【导师】 贺拴海；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 随着对桥梁跨越能力要求的不断提高,作为所有桥型中跨越能力最大的悬索桥越来越成为跨越大江、大河的主要方案。锚碇作为悬索桥主要的承力结构物,起着将主缆拉力传递给地基基础,承受着较大的主缆拉力的作用,是支承主缆、保证全桥主体结构受力稳定的关键部位。本文以武汉阳逻长江公路大桥为工程背景,运用重力式锚碇稳定性理论和锚块与基础的强度分析理论,在大型结构分析程序ANSYS环境下,建立了武汉阳逻长江公路大桥锚碇以及基坑支护结构有限元模型。在有限元模型的基础上针对不同工况进行了详细的有限元局部分析,定量地得出结构物各个部位的应力分布情况,并据此在满足锚碇安全性的前提下对锚碇受力的合理性进行优化。研究了武汉阳逻长江公路大桥锚碇地基承载力、抗滑动稳定性、抗倾覆稳定性和沉降,并且对锚碇进行了斜截面抗剪分析。利用非线性三维有限元理论对基坑开挖过程进行了模拟,得到了支护结构体系在开挖过程中的受力变形特征和在非均布施工荷载下的整体位移对结构的影响,并将二者结果进行了对比。通过优化分析,在控制基坑最大变形不超过有限元分析结果的前提下,可减小下部几道内衬的厚度。这些分析方法和结论的提出将为同类悬索桥锚碇的设计、施工以及进一步的研究提供科学依据。更多还原

【Abstract】 With the continuous improving requirements of bridges’span capacity, suspension bridges, as the largest span capacity have become the main programme when bridge large rivers. As a major bearing structure of the suspension bridge, passing a main cable pull to the foundation, bearing the majority pull of the main cable, the anchorage is the essential part of supporting the main cable to ensure the stability of the whole structure of the main bridge.This thesis taking Wuhan Yangluo Yangtze River Highway Bridge as engineering background, using gravity anchorage stability theory and the strength analysis theory between the anchor block and the foundation, under the large-scale structural analysis procedures ANSYS environment, established the finite element model of Wuhan Yangluo Yangtze River Highway Bridge Anchorage Pit and the supporting structure. On the basis of finite element model carried out a detailed finite element analysis aiming at different working conditions, and drew a quantitative conclusion of the stress distribution, accordingly optimized rationally the bearing of anchorage under the premise of security. Analysis Wuhan Yangluo Yangtze River Highway Bridge in South foundation bearing capacity, anti-slip stability, stability and anti-overturning the settlement, and analysis oblique section shear of the anchorage. Using 3D nonlinear finite element analysis theory simulate the foundation excavation process, carried out Force and deformation characteristics by the deformation of character and in non-uniform under the load of the overall structure of the displacement, And both results were compared. By optimizing analysis, the largest excavation in control deformation of not more than finite element analysis of the results of the premise, may reduce the lower part of the thickness of several lining Road. The analysis method and the conclusion can be applied to this project and other similar projects.更多还原