Abstract: Based on the strength theory of materials, some formulas for shear stress calculation in prestressed variable depth beams are introduced and demonstrated in this paper. The physical concept of each term in the formulas is clarified. An analysis, a comparision and evaluation for all formulas are given. At the same time, shear stress distribution is studied. Finally the theory and formula of bend-shear stress calculation in prestressed thin wall box beams with variable depth are introduced and it is indicated that other formula is inadequate.

摘要： 本文根据材料力学原理,介绍和演证了变高度梁剪应力计算公式,并对计算公式中各项给予明确的物理概念。对不同公式进行了精确的分析、比较,并给予正确的评价。对变高度梁剪应力分布规律作了研究。最后介绍变高度薄壁箱梁的弯剪应力计算原理和公式。并指出其他计算公式的不足之处。