赵  彤  谢  剑  戴自强
    （天津大学土木工程系  300072）

[提要]  通过12根碳纤维布补强加固钢筋混凝土梁的试验，重点研究碳纤维布对梁抗剪承载力的影响和作用。主要试验参数有：碳纤维布的宽度和间距、碳纤维布的粘贴层数、梁的剪跨比、配箍率和混凝土强度。试验研究表明，碳纤维布可以明显地提高钢筋混凝土梁的抗剪承载力，并改善构件的变形性能，增强构件的变形能力。最后，提出了一个简化的碳纤维布提高钢筋混凝土梁受剪承载力的设计计算公式。
[关键词]  碳纤维布  混凝土梁  受剪承载力  补强加固

Twelve simply supported beams strengthened by carbon fiber sheet (CFS) are tested. The experimental factors are width and spacing of CFS strips, layers of CFS, shear span/depth ratio, ratio of stirrup, and concrete strength. The experimental results indicate that CFS can evidently increase the shear strength and improve the ductility of these specimens. Based on the test, a simplified design formula is proposed.
Keywonls:  concrete beam; carbon fiber sheet;shear strength;strengthening