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变截面构件的弯曲变形是实际构件常见变形之一，现行钢筋混凝土设计规范提供的和实际设计计算应用的剪应力计算公式未考虑截面变化的影响，有较大的误差。本文用材料力学方法推出考虑变截面影响的剪应力计算公式，以便在实际设计计算应用。
The bending deformation of the variable cross-section member is one of the common deformations of the actual member. The shear stress calculation formula provided by the current reinforced concrete design specification and the actual design calculation does not take into account the influence of the cross-section change, and has greater errors. In this paper, using the material mechanics method to derive the shear stress calculation formula considering the effect of variable cross-section, in order to practically design and calculate applications.