关于有粘结预应力混凝土梁的极限曲率的讨论

The Discussion of the Limiting Bending Rate of the Bonded PPC Beams

由于砼的极限压应变基本保持定值,则梁的极限曲率φcu的大小主要取决于砼受压区高度的大小.而在有粘结预应力砼梁中,受压区高度不仅跟受拉钢筋的配筋率有关,还跟预应力钢筋、非预应力钢筋的品种和匹配、以及预应力钢筋初始应力水平等因素有关.给出了有粘结预应力砼梁的极限曲率的计算公式和方法,并分析了极限曲率的影响因素.

Because the ultimate compressive strain of concrete is common ,the limiting bending rote φcu of beam depends on the depth of compression. In bonded prestressed concrete beam, the depth of compression is not only related to the ratio of tension reinforcement, but also is related to the kinds and schemes of prestressed reinforcement and common reinforcement and the lever of stress of the prestressed reinforcement. In this paper,the formula and method of limiting rate of bending of the bonded prestressed concrete beam are provided;and the factors which influence the limiting bending rate are analyzed.