【作者】 周伟翔；

【导师】 刘玉擎；

【作者基本信息】 同济大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 上海长江大桥采用钢与混凝土组合连续箱梁的新型结构体系，箱梁的腹板间距以及桥面板外侧悬臂都比较大，钢箱梁翼缘与混凝土桥面板结合的连接件处于复合应力状态，受力机理相当复杂，国内外可供参考的事例及其研究成果很少。本文针对该桥钢翼缘与混凝土桥面板连接部的构造与受力特点，开展了连接件模型试件和连接部局部模型试件的加载试验研究。 通过对连接件模型试件抗剪性能试验，研究了针对该桥使用的焊钉和开孔板连接件的刚度、极限状态承载力及使用状态承载力的取值大小，对国内外抗剪承载力计算式进行了比较分析。进一步实施了焊钉连接件抗拉拔、抗剪拔模型试验，探讨了拉剪承载力相关作用问题。 通过局部模型加载试验及有限元数值分析，从抑制钢梁与混凝土桥面板间拉拔力的出现或降低其大小方面，研究了焊钉连接件不同布置形式的影响，得出了焊钉布置应尽量避开钢翼缘板刚度突变之处，尤其是加劲肋位置上钢翼缘的结果。 同时，对上海长江大桥组合箱梁建立有限元实体模型进行全桥仿真分析，用三维虚拟弹簧元模拟连接件作用来考虑钢梁与混凝土桥面板间的相对滑移，计算分析各施工过程、汽车荷载、温差及收缩作用下每个连接件上的纵、横桥向剪力及拉拔力，并对最不利位置焊钉连接件承载力进行了验算，为全桥连接件设计提出了合理布置要求。更多还原

【Abstract】 A novel steel-concrete composite box girder with large web interval and long cantilever is used in the Yangtze River Bridge. There are few examples and research on the shear connectors between the steel flange and the concrete deck slab both here and abroad which are in the complex combined stress. Based on the configuration and structural behavior of the Yangtze River Bridge, a model test was carried out to study the stress mechanism of the shear connector between the steel flange and the concrete deck.According to the test on the anti-shear performance of shear connectors, the stiffness、 ultimate strength、 serviceable strength used in this bridge were studied and anti-shear capacity expressions of shear connectors were compared. Furthermore, the test on the anti-uplift performance and anti-shear-uplift performance of shear connectors were executed to discuss the relationship between the anti-shear capacity and anti-uplift capacity.According to local part model test and finite element analysis, the different distributions of stud shear connectors were studied in order to restraint or reduce the uplifting force. The results indicated that the distribution of stud shear connectors should keep away from the abrupt change of flange rigidity, especially the stiffeners.At one time, finite model of the Yangtze River Bridge was built for the simulation analysis and the shear connectors were simulated by three-dimensional spring elements in order to consider the slip between the steel flange and the concrete deck slab. Longitudinal shear、 transverse shear and uplifting force caused by dead load、 live load、 temperature and shrinkage were exactly calculated. The studs at a disadvantage were checked, and the reasonable distribution of the studs for this bridge was advanced.更多还原