附加锚固法对CFRP加固RC梁的力学性能研究
2021-07-30刘金娥何伟刘吉敏付婷婷
刘金娥 何伟 刘吉敏 付婷婷



摘 要:为评价各附加锚固法的优劣和CFRP加固梁式结构的延性,通过钢筋混凝土梁的抗弯加固试验,研究不同附加锚固法对加固结构综合力学性能的影响及其作用机制,并根据试验观察,提出材料利用率指标,并发展了位移延性系数指标,以解决现有研究的不足。研究结果表明,采用不同附加锚固法可提高加固梁的综合力学性能,其中混杂锚固法的抗弯加固效果最优,提出和发展的指标可较好地评价加固、锚固效果与加固结构的延性。
关键词:钢筋混凝土梁;CFRP加固;锚固方法;材料利用率;延性
中图分类号: TU528 文献标志码:A
文章编号:1672-1098(2021)01-0049-07
收稿日期:2020-09-16
基金项目:国家自然科学基金资助项目(51208005);安徽理工大学博士基金资助项目(11084)
作者简介:刘金娥(1995-),女 ,安徽滁州人,在读硕士,研究方向:结构工程。
Study of RC Beams Strengthened by Externally Bonded CFRP Sheets with Additional Anchoring Methods
LIU Jine1,HE Wei1,LIU Jimin1,FU Tingting2
(1.School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China;2.Housing Engineering Department of General Station of Construction Project Quality and Safety Administration and Supervision, Jinhua Zhejiang 321000,China)
Abstract:To evaluate different additional anchoring methods and the ductility of beams strengthened by CFRP, the effects and the mechanism of anchoring methods on mechanical performance of strengthened beams are studied by the experiments. The paper proposes a material utilization ratio index and develops a displacement ductility index to solve the deficiency of the existing researches according to the experimental observation. The experimental results show that the mechanical performance of strengthened beams will be improved by additional anchoring methods, among which the strengthening effect provided by the hybrid anchoring method is the best. The proposed and developed indices are capable of evaluating the strengthening and anchoring effects, and the ductility of strengthened structures.
Key words:reinforced concrete beam; CFRP strengthening; anchoring method; material utilization ratio; ductility
纖维增强聚合物(Fiber Reinforced Polymer,FRP)复合材料广泛应用于钢筋混凝土(Reinforced Concrete,RC)结构的抗弯加固[1-4]。试验研究表明,FRP-混凝土界面的早期剥离破坏不仅会导致无法充分利用FRP的高强材料特性,而且会导致加固失效[5-6]。因此,FRP-混凝土界面的可靠粘贴,是确保有效提高加固结构的综合力学性能与FRP材料利用率的关键[7]。
附加锚固法是实现FRP-混凝土界面可靠粘结的有效途径之一。现有附加锚固法主要有端部机械锚固[8]、U形箍(FRP)锚固[9]、梁侧约束钢板锚固[10-11]和混合锚固[12]等方法。然而,当前研究还有很多不足。首先各附加锚固方式的研究多为独立开展,即便是同种锚固法,在不同研究中得到的锚固效果也不同。……
