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应用初等梁弯曲理论公式与平面杆系有限元法以及有限条法程序相结合的方法,建立了分析变高度箱梁桥剪力滞效应的计算模型。从两个算例(连续梁桥和悬臂梁桥)的计算结果发现,应用本文模型算得的箱梁翼缘正应力沿横桥向的分布,与应用空间有限元法和有限条法算得的分布,吻合甚好。因此,本文方法具有实用价值,可供设计者选用。
The calculation model of the shear lag effect of the box girder bridge with variable height is established by the method of combining the theory of primary beam bending with the finite element method of plane bar and the finite strip method. From the calculation results of two examples (continuous girder bridge and cantilever girder bridge), it is found that the distribution of normal stress of box girder flange in transverse direction calculated by this model is in agreement with the distribution calculated by finite element method and finite strip method Very good. Therefore, this method has practical value for designers to choose.