钢筋混凝土连续梁体外预应力筋加固的试验与计算

Experiment and calculation of stretching force of exterior prestressing method for the strengthening of R.C.continuous beams

本文通过对混凝土T形连续梁采用体外预应力方法加固的试验,介绍了体外张拉预应力筋的设计、加载过程、折线预应力加固、加固后的连续梁再加载和试验结果。结果表明张拉体外预应力筋后,试验梁抗裂荷载明显提高,抵抗变形能力增大,加固效果很好。

In this article, the exterior prestressing method for strengthening of the R. C. eontinuous T-beams has been experimented and designed. It has shown comprehensively the ways of calculation of stretching forces, its loading operative procedures and, its broken-line prestressed strengthening method. It has also demonstrated how the final test-results of loading and reloading of the strengthened continuous beams brought into practice. In the final analysis, it shows clearly that exterior strengthening method has raised the beams crack resistance and proved of high effectiveness.