体外预应力在桥梁结构加固中的理论分析与技术应用研究

Theoretical Analysis and Technology Application Research of External Prestressing in Bridge Structure Reinforcement

体外预应力技术隶属于无黏结预应力的一种受力形式,预应力索可以是单根或多根通过锚固点与转向块而置于混凝土之外,其他部分的预应力索与结构柱体分离而改变受力体系,故称之为体外预应力。可用于新建桥梁的设计与旧桥上部结构的拓宽及加固,适用于极限状态理论设计条件下的适筋梁、超筋梁和少筋梁的加固与利用。

The external prestressing technology belongs to a kind of unbonded prestressed force form, and the prestressed cable can be single or multiple root by anchoring point and steering block placed in the concrete, the other parts of the prestressed cable and structure change with the column separation stress system called external prestressing. And it can be used for the design of newly built Bridges and broadening and strengthening old bridge upper structure, and it also applies to applicable to the theory of limit state design under the condition of optimum less reinforced beam, steel beam ,steel beam reinforcement and the use.