体外预应力钢筋混凝土梁桥极限承载能力分析

在体外预应力加固钢筋混凝土筒支梁桥的结构分析中，存在正常使用极限状态和承载能力极限状态两阶段，本文通过对体外预应力筋加固构件中的水平筋和斜筋进行在极限承载能力下的极限应力分析，从而得出当两者面积相同时，体外预应力加固钢筋混凝土筒支梁桥的受力特性与无粘结部分预应力混凝土相似，可直接采用无粘结部分预应力混凝土的极限应力作为内水平加固钢筋的极限应力；当两者面积不同时，斜筋对水平筋极限应力的影响较大，且斜筋自身的极限应力也会变化。

Analyzing Ultimate Stress from Simply-supported Beam of Reinforced Concrete with External Prestressed Strengthened System

There are tow stages about construction analying of simply-support beam with external prestressed strengthened system. One is ultimate condition of normal operation, the other is ultimate condition of incurring capacity. In this paper, it can be drawn a conclusion from analyzing ultimate stress of horizontal strengthened bars and inclined bars with external prestressed strengthened system : When the area of the two is same , the characteristic of external prestressed strengthened simply-support beam is similar to unbounded partially prestressed structure. The Ultimate stress of unbounded partially prestressed structure can be regarded as horizontal strengthened bars. When the area of the two is different, horizontal strengthened bars are affected by inclined bars and inclined bars also change ultimate stress themselves.