体外预应力混凝土简支梁的极限强度分析

Ultimate strength analysis for external prestressed concrete beams

在分析体外预应力钢筋与混凝土主梁变形的基础上，通过截面内力平衡方程和变形协调关系，对体外预应力混凝土梁进行了从加载到破坏的全过程分析，得到了极限状态下体外筋的极限应力和混凝土梁的极限抗弯强度。利用本文介绍的计算方法，可以考虑不同的荷载形式（包括对称荷载和不对称荷载），不同的截面形式及不同的普通钢筋用量等因素对主梁极限状态的影响，并能得到中间过程及破坏阶段混凝土、普通钢筋、预应力钢筋的应变和应力。通过本文理论得到的计算结果得到了试验的验证。

 Presents the ultimate strength of the concrete beam obtained through analysis for the whole deformation process of external prestressed concrete beam from loading to failure of external prestressed concrete beam by means of section force equation and coordination of deformation and ultimate stress of tendon with such facts as type of load seaction and quantity of reinforements taken into calculation and the effect of strain and stress of concrete reinforcement tendon into consideration．