不同种类FRP加固混凝土梁加固效果试验研究

Test research on strengthening effects of various FRP on RC beams

选取6根不同种类的纤维布(FRP)加固的钢筋混凝土试验梁进行研究,分析对比了用玄武岩纤维布(BFRP)、碳纤维布(CFRP)和玻璃纤维布(GFRP)加固的钢筋混凝土梁的不同加固效果,讨论了初始预损伤及不同U形箍筋的布置方式对纤维布加固效果的影响;通过试验梁的开裂荷载、屈服荷载、极限荷载、跨中挠度及纤维布应变等参数,对粘贴纤维布加固钢筋混凝土梁的受弯性能及破坏特征进行了分析.对比研究结果表明碳纤维布加固梁的承载力和延性提高最大,玄武岩纤维布用于加固的性价比最优,初始预损伤对加固效果影响不大,而沿全梁横向布置U形锚固形式并不能有效发挥纤维布的抗拉性能.

Test results of six reinforced concrete （RC） beams strengthened with various fiber reinforced polymer （FRP） are discussed. The strengthening effects of basalt fiber reinforced polymer （BFRP）, carbon fiber reinforced polymer （CFRP） and glass fiber reinforced polymer （GFRP） are compared; the pre-damage and arrangement of U-stirrup anchorage on the strengthening effects are analyzed. The flexural behavior and failure modes of the beams bonded with various FRP are investigated through the experimental data, such as cracking load, yielding load, ultimate load, mid- span deflection and FRP strength strength ened ening with CFRP is superior strain. Comparative results show the bearing capacity an are improved to the greatest extent; while the cost perfo to the others. There is little influence of pre-damage on d ductility of beam rmance of BFRP in strengthening, and the anchorage along the beam inversely affects the effects of FRP on strengthened beam.