摘要
制作了五根部分预应力混凝土梁,开展了碳纤维布加固梁和未加固梁的对比疲劳试验。试验结果表明:采用粘贴一层碳纤维布加固梁的疲劳寿命比未加固梁提高了23%,粘贴二层碳纤维布的加固梁疲劳寿命提高了55%。加固梁在压区混凝土应变、钢筋残余应变和残余挠度等性能方面都有明显的改善。因此,粘贴碳纤维布可以较好地提高损伤部分预应力梁的抗疲劳性能、延长损伤混凝土梁的使用寿命,为碳纤维布加固混凝土结构的疲劳性能研究提供了试验依据。
The fatigue tests of the partially prestressed beams strengthened by CFRP-sheets and the non-strengthened beams were conducted comparatively. The results show that the fatigue life of the beams strengthened by CFRP-sheet of one layer is improved by twentythree percent and improved by fifty-five percent for the beams strengthened by CFRP-sheet of two layers. And the fatigue deformation decreases greatly. The tests show that the CFRP-sheet is greatly useful for the improvement of fatigue performance of partially prestressed damaged beams and set up a test base for the study on fatigue performance of the concrete structure strengthened by CFRP-sheet.
出处
《建筑科学》
北大核心
2008年第9期19-22,105,共5页
Building Science
基金
江西省自然科学基金(0450033)
