新型大纵肋正交异性钢板—混凝土组合桥面板优化设计及适用性研究

发布时间：2018-07-10 03:16

本文选题：正交异性钢桥面板 + 组合桥面板　；参考：《西南交通大学》2016年硕士论文

【摘要】：为提升正交异性钢桥面板的抗疲劳性能,国内外学者提出了大纵肋正交异性钢桥面板,研究表明：相对于传统的正交异性钢桥面板,该结构在整体疲劳性能和经济性等方面具有突出优势。但该类结构顶板与纵肋焊缝和纵肋腹板局部区域疲劳强度不足问题突出,进一步完善结构设计并改善上述控制部位的疲劳性能,是推动这一新型桥面板结构发展的基础和关键。在大纵肋正交异性钢桥面板上设置混凝土结构层,发展新型大纵肋正交异性钢板—混凝土组合桥面板,是改善大纵肋正交异性钢桥面板关键疲劳易损部位抗疲劳性能的有效途径。对于该类结构的优化设计问题及其在典型桥型中的适用性问题进行了研究。主要研究工作如下：(1)概述正交异性钢桥面板发展历程,简述传统正交异性钢桥面板面临的两类难题,综述了大纵肋正交异性钢桥面板的优势和不足。在此基础上阐述了新型大纵肋正交异性钢板—混凝土组合桥面板的发展概况；(2)以典型的大纵肋正交异性钢板—混凝土组合桥面板为研究对象,建立了其参数化有限元模型,分析了增设混凝土结构层在改善正交异性钢桥面板局部应力集中、增大结构局部刚度方面的有效性。结果表明：组合结构体系能够增加其桥面刚度,显著降低正交异性钢桥面板关键疲劳易损部位的应力水平；(3)确定了影响新型大纵肋正交异性钢板—混凝土组合桥面板结构受力的主要设计参数,在此基础上基于Kriging方法对两类大纵肋组合桥面板的截面参数进行了优化设计。研究结果表明,所提出的Kriging方法适用于大纵肋组合桥面板的结构优化设计问题。(4)以所确定的新型大纵肋正交异性钢板—混凝土组合桥面板优化设计方案为研究对象,采用热点应力法对于三类桥面板的疲劳性能进行了对比研究。研究结果表明：正交异性钢桥面板与混凝土结构层组成的组合受力体系能够显著降低新型大纵肋正交异性钢板—混凝土组合桥面板中钢桥面板关键疲劳易损部位的应力幅,提高其疲劳寿命；(5)以港珠澳大桥深水区非通航孔标准联连续钢箱梁桥为工程背景,研究了新型大纵肋正交异性钢板—混凝土组合桥面板在大跨度连续梁桥中的适用性问题。结果表明：新型大纵肋正交异性钢板—混凝土组合桥面板在大跨度连续梁桥中具有良好的适用性。
[Abstract]:In order to improve the fatigue resistance of orthotropic steel bridge panels, domestic and foreign scholars put forward the orthotropic steel bridge panels with large longitudinal ribs. The results show that: compared with the traditional orthotropic steel bridge panels, The structure has outstanding advantages in overall fatigue performance and economy. However, the fatigue strength in the local region of the roof and longitudinal rib welds and webs of this kind of structures is insufficient, and it is the foundation and key to promote the development of this new bridge deck structure to further improve the structural design and improve the fatigue performance of the above control parts. A new type of orthotropic steel plate-concrete composite deck slab with large longitudinal rib is developed by placing concrete structure layer on the slab of orthotropic steel bridge with large longitudinal rib. It is an effective way to improve the fatigue resistance of the key fatigue vulnerable parts of orthotropic steel bridge panel with large longitudinal rib. The optimization design problem of this kind of structure and its applicability in typical bridge type are studied. The main research work is as follows: (1) the development course of orthotropic steel bridge panel is summarized, two kinds of difficult problems facing orthotropic steel bridge face plate are briefly described, and the advantages and disadvantages of orthotropic steel bridge face slab with large longitudinal rib are summarized. On this basis, the development of new type orthotropic steel plate-concrete composite deck slabs with large longitudinal ribs is described. (2) taking the typical orthotropic steel plate-concrete composite deck slabs with large longitudinal ribs as the research object, the parametric finite element model is established. The effectiveness of adding concrete layer in improving local stress concentration and increasing local stiffness of orthotropic steel bridge slab is analyzed. The results show that the composite structure system can increase the stiffness of the bridge deck and reduce the stress level of the key fatigue vulnerable parts of the orthotropic steel bridge panel. (3) the main design parameters affecting the stress of a new type of orthotropic steel plate concrete composite deck slab with large longitudinal ribs are determined. Based on the Kriging method, the cross-section parameters of two kinds of large longitudinal rib composite deck slabs are optimized. The results show that the proposed Kriging method is suitable for the structural optimization design of large longitudinal rib composite deck slabs. (4) A new type of orthotropic steel-concrete composite deck slab with large longitudinal ribs is chosen as the research object. The fatigue behavior of three kinds of bridge slabs is studied by means of hot spot stress method. The results show that the combined stress system composed of orthotropic steel deck slab and concrete structure layer can significantly reduce the stress amplitude of the key fatigue vulnerable parts of steel bridge slab in the new type of orthotropic steel plate concrete composite deck slab with large longitudinal ribs. (5) taking the non-navigable hole standard combined continuous steel box girder bridge in the deep water area of HongKong-Zhuhai-Macao Bridge as the engineering background, the applicability of a new type of large longitudinal rib orthotropic steel-concrete composite deck slab in the long-span continuous beam bridge is studied. The results show that the new type of orthotropic steel plate and concrete composite deck slab with large longitudinal ribs has good applicability in long span continuous beam bridges.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U443.31

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