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首先针对一集中力作用的简支梁结构,探讨了有限元分析中不同荷载施加方式对计算结果的影响,通过和试验值的比较,得出集中力施加于箱梁中性轴部位的理论分析结果与试验值最为接近。针对混凝土箱梁常见的翼板变厚度、腹板与翼板连接部位加腋等结构特点,通过有限元理论分析方法,研究了翼板厚度变化对剪滞效应的影响因素和规律,得出悬臂根部的翼板越厚、梗腋面积越大,则翼板的剪滞效应越小。
Firstly, aiming at a simply supported beam structure with concentrated force, the influence of different load applying modes on the calculation results in finite element analysis is discussed. The theoretical analysis of concentrated force exerted on neutral axis of box girder is obtained by comparison with experimental values Results and test values are the closest. In view of the common wing slab thickness change, the connection between the web and the wing plate, axillary structure and other structural features, the influence factors and rules of the slab thickness variation on the shear lag effect are studied through the finite element method. The thicker the base of the wing, the greater the size of the stem axillary area, the smaller the shear lag effect of the wing.