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本文应用变分法和有限条法分析箱形梁桥的剪滞效应。变分解法是一种不需要使用计算机的实用方法,适用于解各种支承的箱形梁包括有限条法难以求解的箱形结构。本文还运用迭加原理,对连续梁等超静定箱梁提出比较简捷的计算方法。 应用上述两种方法,探讨了箱形梁桥剪滞效应随桥的截面几何特性、跨宽比、支承条件,以及荷载型式等因素变化的影响。最后通过模型试验,验证了理论分析。
In this paper, the shear lag effect of box girder bridge is analyzed by using variational method and finite strip method. The decomposed method is a practical method that does not require the use of a computer. The box beam that is suitable for solving various supports includes a box structure that is difficult to solve by the finite strip method. This paper also uses the superposition principle to propose a relatively simple calculation method for the statically indeterminate box girders such as continuous beams. Using the above two methods, the effect of the shear lag effect of the box girder bridge on the cross-section geometric characteristics, span ratio, support conditions, and load type variation was investigated. Finally, a model test was conducted to verify the theoretical analysis.