导言在桥梁工程中,当设计变截面或变高度预应力混凝土连续梁时,在截面与急剧改变的临界截面处的斜向拉力必须检算。作者首先对由于预应力、恒载或活载弯矩及相应力引起的剪应力如何计算的问题提出议。这样 Introduction In bridge engineering, the diagonal tension at the critical cross-section and rapidly changing cross-section must be checked when designing variable section or variable height prestressed concrete continuous beams. The author first proposed the issue of how to calculate the shear stress due to prestress, dead load or live load moment and corresponding force. such