碳纤维布加固含裂缝混凝土梁的裂缝扩展阻力性能  

Crack Extension Resistance Performances of Cracked Concrete Beam Reinforced with CFRP Sheet

作　　者：徐庆钟 易富民[2] 余贵廷 

机构地区：[1]中铁十一局集团第五工程有限公司,重庆400037 [2]大连理工大学土木水利学院,大连116023

出　　处：《三峡大学学报（自然科学版）》2009年第4期65-68,共4页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然基金项目(50878036)

摘　　要：基于虚拟裂缝模型和试验测得的荷载与裂缝口张开位移曲线,计算得到碳纤维(CFRP)加固含裂缝混凝土梁的裂缝扩展阻力曲线,并讨论试件尺寸对CFRP加固试件阻力性能的影响.结果表明,CFRP加固试件中也存在断裂过程区长度减小的现象,纤维布的阻裂作用是影响CFRP加固试件裂缝扩展阻力性能的关键因素,并且试件高度和初始裂缝长度对CFRP加固试件的阻裂性能无明显影响.Based on the fictitious crack model and the load versus crack mouth opening displacement curves recorded in the experiment, the crack extension resistance curves （KR-curves） of the CFRP-reinforced cracked concrete beams are calculated. Then, the effects of specimen sizes on the crack extension resistance performances of the CFRP-reinforced cracked concrete beams are discussed. The results indicate that, the fracture process zone length would also decease in the CFRP-reinforced concrete beam; and the arresting contribution from CFRP to concrete crack is the key factor affected the crack extension resistance performances of the CFRP-reinforced specimen; what is more, specimen depth and initial crack length have little effect on the crack extension resistance performance of the CFRP-reinforced specimen.

关 键 词：混凝土 CFRP布 断裂阻力 虚拟裂缝模型 

分 类 号：TU375.1[建筑科学—结构工程]