体外预应力加固混凝土简支梁的试验研究

体外预应力结构相对于传统的体内预应力结构具有维护管理方便、预应力损失小、施工工期短等优点。因此,体外预应力技术广泛应用于已有混凝土结构的加固及维修。文章基于体外预应力加固技术的特点,采用室内实验模拟了实际工程中混凝土受弯构件的工作状况,对体外预应力转向器等对试验梁的影响进行了分析,指出了其破坏特征,为体外预应力加固桥梁提供了依据。试验证明,利用体外预应力技术加固混凝土简支梁桥,可以明显提高承载力及延性。

Experiment Study on Strengthening Concrete Simple-span Beams by Extemal Prestressing

Compared with the traditional internally prestressed members,the externally prestressed members have such advantages as convenient for maintenance management,little loss of prestress.Therefore,externally prestress has found wide applications in concrete structure forreinforcement and maintenance.The paper present simulation of the working conditions of concrete members under bending force and the analysis of the impact of the externally prestressed diverter on the test beam to point out its damage characteristics.The test results show that the externally prestress technology can be applied in strengthening concrete simple span beam to enhance its bearing capacity and ductility.