公路桥预应力混凝土(P.C)梁斜截面抗剪强度计算

Calculation of the Shear Strength in an Inclined Section of the Prestressed Concrete Beam of Highway Bridge

本文应用林同炎教授的荷载平衡法导出 P.C 梁的混凝土预压应力引起的抗剪强度 Q_y,迭加于 R.C 梁的混凝土和箍筋的抗剪强度 Q_h、Q_k 之中,构成 P.C 梁斜截面抗剪强度 Q_(bky)。在这一基础上,对移动荷载及均布荷载作用下,P.C 简支梁的斜截面剪压破坏的临界断面位置,提出了一个比较合理的计算方法。

In this paper,the shearing strength Q_(hky) in an inclined section of a simply supported prestressed concute beam is formed by superimposing the shearing strength Q_y from the precompression in concrete according to load balancing method of prof,T.Y Lin on the sum of shearing strength of concrete Q_h and that of stirrups Q_k·Based on the derivation,a reasonable method of defining the position of critical section nnder inclined shear-compression fai lure subjecting to moving load and uniformly distributed load is proposed.