体外预应力混凝土简支梁全过程分析

All Stage Analysis of Externally Prestressed Concrete Beam

该文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。利用该文介绍的计算方法 ,可以考虑不同的荷载形式、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。

Based on the analysing deformation of external prestressed concrete beam, the total process from loading stage to fail stage was analyzed for external prestressed concrete beam by means of section force equation and deform accordance, and the ultimate stress of the tendon and the ultimate strength of the concrete beam were found out. With the abore mentioned approach,such factors as influence of load type, section type and the quantity of reinforcements on beam limits can be considered,and the strain and stress of concrete, reinforcement, tendon can be obtained in the process of loading. The theoretical calculation results were verified by the testing results.