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基于变截面抗弯刚度函数,利用等截面剪力滞效应计算公式得到了变截面剪力滞效应的近似计算方法。变截面悬臂梁算例中与有限元软件计算结果比较,结果数据显示吻合良好。通过改变梁宽,分析宽跨比对剪力滞效应的影响,发现随着梁宽增加刚度比增加,剪力滞影响变大。本文变截面箱梁近似计算方法可应用于工程计算,为工程变截面箱梁剪力滞效应提供了一种手算计算方法。
Based on the variable section flexural rigidity function, the approximate calculation method of the shear lag effect of the variable section is obtained by using the formula of shear lag effect of the section. The calculated results of finite element software in the case of variable cross-section cantilever beam are compared with each other and the results show good agreement. By changing the beam width and analyzing the influence of the ratio of width to span on the shear lag effect, it is found that the influence of shear lag becomes larger as the stiffness ratio increases. The approximate calculation method of box girder with variable section can be applied to engineering calculation, which provides a hand calculation method for the shear lag effect of box girder.