项目名称： 连续钢混组合梁桥的抗剪连接及弯扭特性的分析理论研究

项目编号： No.51478422

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 徐荣桥

作者单位： 浙江大学

项目金额： 85万元

中文摘要： 本项目基于细观力学中周期结构的渐近展开法和参变量变分原理，研究钢混组合结构中抗剪连接件的刚度、极限承载力、徐变和疲劳特性与其形状、分布及材料特性之间的理论关系；然后利用状态空间法和多变量变分原理，分析抗剪连接刚度和体外预应力对连续组合梁中钢结构和混凝土板荷载分配的影响，特别对于负弯矩区组合截面受力特性的影响，建立抗剪连接刚度沿跨径方向非均匀分布并考虑体外预应力影响的连续钢混组合梁的解析分析理论，优化抗剪连接件的形状、尺寸和沿桥跨径的分布密度，以降低混凝土桥面板在负弯矩区的拉应力；最后在考虑钢结构与混凝土板之间相对滑移的基础上，对传统的基于薄壁闭口截面的箱梁分析理论进行改进，建立部分作用钢混组合箱形截面的分析理论，为连续钢混组合结构梁桥的设计分析提供理论基础。因此本项目具有重要的理论价值和实际应用背景。

中文关键词： 组合结构；周期结构；剪切连接件；连续组合梁桥；弯曲与扭转

英文摘要： Based on the method of asymptotic homogenization for periodic structures, this proposal is aimed at investigating the analytical relations of the stiffness, strength, creep and fatigue properties of the shear connector with their shapes, sizes, material properties and distributing layout. The effect of the stiffness of the shear connectors will be studied on the mechanical behaviors of steel beam and concrete slab, especially those in the hogging moment regions of continuous composite beams. Analytical solutions will be developed for the continuous composite beams with non-uniform distributing shear connectors, and will be adopted to optimize the shapes, sizes and layout of the shear connector along the span for optimized tensional stress in concrete slab. The classical theory of box beam, which is based on the theory of closed cross section with thin wall, can also be extended to consider the effect of the interfacial slip between the steel-beam with the concrete slab due to the flexible shear connector. The presented theories can be utilized to analyze and design composite structures in bridge engineering.

英文关键词： Composite Structures;Periodic Structures;Shear Connector;Continuous Composite Girder Bridge;Bending and Torsion