在后张予应力梁中,应使予应力钢索端部受到锚固,予加应力方能起到作用,这就需要在端部施加突变力。根据圣文南原理,在离开端部一定距离处(通常这个距离等于或大于梁的高度)只存在纵向力,且此力可用材料力学的公式算得。作用于梁端部的突变力,当为递增变化而形成线性连续分布时,就会造成横向应力和剪应力。自梁端至仅 In the post-tensioned prestressed beam, the end of the prestressed wire should be anchored, and prestressing can play a role, which requires the application of abrupt force at the end. According to the St. Vincent’s principle, there is only a longitudinal force at a certain distance from the end (usually this distance is equal to or greater than the height of the beam), and this force can be calculated using the formula of the material mechanics. The catastrophic forces acting on the ends of the beam, when forming a linear continuous distribution for incremental changes, result in transverse and shear stresses. From beam end to only