碳纤维布与钢板复合加固梁剥离破坏研究

Debonding Failure of Beams Combined Strengthened with CFRP and Steel Plate

通过12根碳纤维布与钢板复合加固钢筋混凝土梁的抗弯性能研究,结果表明复合加固方式能有效地改善被加固构件的受力性能,但常由于复合加固层的剥离可能导致加固效果的降低。复合加固层与被加固构件之间的剥离是由于薄弱截面在剪应力及正应力的集中作用下而产生的,文中对复合加固层与混凝土之间的粘结剪应力及剥离正应力的计算公式分别进行推导,并进一步对碳纤维布与钢板复合加固的剥离机理进行分析,为工程应用提供依据。

The experimental researches on the flexural behaviors of 12 reinforced concrete beams combined strengthened with CFRP and steel plate are carried out,and the results show that the combined strengthening is capable of improving the flexural performance effectively,but sometimes the interface debonding leads to lower the strengthening effect.The debonding between strengthening layer and concrete arises due to the joint effect of shear stress and bond normal stress,the calculation formulas for the two stresses are derived,and the mechanism of debonding failure is also types of discussed.