碳纤维增强混凝土梁抗弯性能试验研究

Experimental study on flexural behavior of carbon fiber strengthened RC beams

通过在普通混凝土中掺入不同掺量的短切碳纤维,研究其对钢筋混凝土适筋梁正截面抗弯性能的影响。混凝土水胶比选定为0.4,碳纤维体积掺量分别为0、0.3%、0.6%、0.9%,制作8根梁进行正截面抗弯试验,研究短切碳纤维对钢筋混凝土梁破坏形态、开裂荷载、极限荷载及位移延性系数等的影响。试验结果表明,掺入碳纤维使梁表现出更大的弯曲变形性能,减少了梁纯弯段主要裂缝的条数,进而有效提高了混凝土梁的抗裂能力;开裂弯矩和极限弯矩随掺量的增加呈线性增长;掺入碳纤维同时提高了钢筋混凝土梁的位移延性系数,当掺量为0.6%时提高效果显著。

By adding chopped carbon fiber （CF） to concrete, the effects of CF on the flexural behavior of RC beams were investigated. Totally eight RC beams with water/cement ratio of 0.4, CF contents of 0,0.3%, 0.6% and 0.9%, were made for flexural test to study the failure mode, cracking and ultimate strengths, and displacement ductility coefficient of RC beam.Test results showed that adding CF can significantly improve bending deformability,reduce major cracks and enhance the crack resistance of RC beam.Cracking moment and ultimate moment increase linearly with the CF content. Displacement ductility coefficient increases with the CF content and achieve maximum value at CF content of 0.6%.