高延性预应力碳纤维增强复合材料板加固钢筋混凝土梁的有限元分析

刘斌; 杨家琦; 刘天桥; 胡黎俐; 冯鹏

doi:10.3724/j.gyjzG23111328

高延性预应力碳纤维增强复合材料板加固钢筋混凝土梁的有限元分析

doi: 10.3724/j.gyjzG23111328

1. 中国矿业大学(北京), 北京 100083;
2. 北京工业大学, 北京 100124;
3. 上海交通大学, 上海 200240;
4. 清华大学, 北京 100084

基金项目:

中国建材集团与沙特阿美石油公司"非金属材料创新中心"(NEXCEL)研发类项目(2022TDA1-1)。

详细信息

作者简介:
刘斌,硕士研究生,主要从事纤维复合材料加固工程结构的研究。电子信箱:1062456545@qq.com

计量
- 文章访问数: 94
- HTML全文浏览量: 12
- PDF下载量: 9
- 被引次数: 0
出版历程
- 收稿日期: 2023-11-13
- 网络出版日期: 2024-06-24

Finite Element Analysis of Reinforced Concrete Beams Strengthened with Prestressed CFRP Plates with High Ductility

1. China University of Mining and Technology (Beijing), Beijing 100083, China;
2. Beijing University of Technology, Beijing 100124, China;
3. Shanghai Jiao Tong University, Shanghai 200240, China;
4. Tsinghua University, Beijing 100084, China

摘要

摘要: 碳纤维增强复合材料(CFRP)以其轻质、高强、耐腐蚀的优势,在混凝土结构加固中得到了较为广泛的应用,现已发展出外贴、内嵌、预应力等多种加固方法。然而,由于CFRP及与其黏结的混凝土界面的弹脆性,加固后的混凝土受弯构件常表现为脆性破坏,延性较低。因此,在以往提出的跨中顶撑张拉预应力CFRP板加固方法的基础上,提出了一种高延性预应力CFRP板加固方法,通过改进顶撑装置的属性,在局部设置弹塑性机构,大幅提升加固梁整体的延性。经过有限元分析证实,提出的加固方法可以延缓CFRP板的应变增长并使其始终维持在较高应力水平,在极限承载力降幅不多的情况下,加固梁的极限挠度最大提升了137%,大幅度提高了加固梁的延性,并且为后续新型加固方法的研发提供参考依据。
- CFRP /
- 预应力 /
- 加固 /
- 混凝土梁 /
- 延性 /
- 有限元分析
Abstract: Carbon fiber-reinforced polymer (CFRP) has been widely used in structural strengthening due to its light weight, high strength and anti-corrosion. Specifically, in strengthening RC beams, various strengthening techniques, such as external bonding, near-surface mounting and prestressing, have been developed so far. However, due to the brittle nature of the CFRP material and the interface of concrete bonded with CFRP plates, strengthened beams used to exhibit brittle failure at low ductility. Therefore, a novel strengthening method with high ductility and prestressed CFRP plates was proposed based on previous findings on the mid-span-supported strengthening technique by changing the mid-span deviators to elastic-plastic devices. The effectiveness of the proposed strengthening method was verified by finite element analysis. The finding indicated the new method could maintain the CFRP at a high stress level and increase the ultimate deflection up to 137% in limited loss of ultimate strength. The results could be reference to further development of structural strengthening methods.
- CFRP /
- prestress /
- strengthening /
- concrete beams /
- ductility /
- finite element analysis

HTML全文

参考文献(20)

[1]	杨心壤.为桥梁戴上"健康手环":公路桥梁结构健康检测系统初探[J].中国公路,2022(10):20-21.
[2]	中交路桥科技有限公司. 桥梁检测市场\|90万座桥梁,危桥病桥占45%[EB/OL].[2023-11-13 ].http://www.zjlq.net/Article/Article_5353.html.
[3]	梅葵花,王凤轩,孙胜江.纤维增强复合材料加固混凝土桥梁结构研究进展[J].建筑科学与工程学报,2024(1):31-51.
[4]	吴刚,安琳,吕志涛.碳纤维布用于钢筋混凝土梁抗弯加固的试验研究[J].建筑结构,2000(7):3-6,10.
[5]	李荣,滕锦光,岳清瑞.FRP材料加固混凝土结构应用的新领域:嵌入式(NSM)加固法[J].工业建筑,2004,34(4):5-10.
[6]	YANG J Q, FENG P, LIU B, et al. Strengthening RC beams with mid-span supporting prestressed CFRP plates: an experimental investigation[J]. Engineering Structures, 2022, 272,115022.
[7]	彭晖,尚守平,金勇俊.预应力碳纤维板加固受弯构件的试验研究[J].工程力学,2008(5):142-151.
[8]	尚守平,彭晖,童桦.预应力碳纤维布材加固混凝土受弯构件的抗弯性能研究[J].建筑结构学报,2003(5):24-30.
[9]	HAJIHASHEMI A,MOSTOFINEJAD D,AZHARI M. Investigation of RC beams strengthened with prestressed NSM CFRP laminates[J]. Journal of Composites for Construction, 2011,15(6):887-895.
[10]	RAAFAT E-H, KHALED S. Prestressed near-surface mounted fibre reinforced polymer reinforcement for concrete structures: a review1[J]. Canadian Journal of Civil Engineering, 2013,40: 1127-1139.
[11]	KIM Y J, SHI C Y, GREEN M F. Ductility and cracking behavior of prestressed concrete beams strengthened with prestressed CFRP sheets[J]. Journal of Composites for Construction, 2008(12): 274-283.
[12]	CHAHROUR A, SOUDKI K. Flexural response of reinforced concrete beams strengthened with end anchored partially bonded carbon fiber-reinforced polymer strips[J]. Journal of Composites for Construction, 2005, 9(2): 170-177.
[13]	CHOI H T, WEST J S, SOUDKI K A. Analysis of the flexural behavior of partially bonded FRP strengthened concrete beams[J]. Journal of Composites for Construction, 2008, 12(4): 375-386.
[14]	SEO S Y, LEE M S, FEO L. Flexural analysis of RC beam strengthened by partially de-bonded NSM FRP strip[J]. Composites Part B, 2016, 101(9): 21-30.
[15]	张智梅, 黄庆彬. 部分黏结 FRP 加固混凝土梁抗弯性能研究[J]. 铁道科学与工程学报, 2020, 17(4): 965-971.
[16]	YANG J Q, SMITH S T, WANG Z Y, et al. Numerical simulation of FRP-strengthened RC slabs anchored with FRP anchors[J]. Construction and Building Materials, 2018, 172:735-50.
[17]	Comite Euro-International Du Beton. CEB-FIP Model Code 1990: Design Code[S]. London: Thomas Telford, 1993.
[18]	SANEZ L P. Discussion of equation for the stress-strain curve of concrete by Desayi P and Krishnan S[J]. Journal of American Concrete Institute, 1964,61: 1229-1235.
[19]	HORDIJK D A. Local approach to fatigue of concrete[D]. Delft: Technische Universiteit Delft, 1991.
[20]	CHEN G M, TENG J G, CHEN J F. Finite-element modelling of intermediate crack debonding in FRP-plated RC beams[J]. Journal of Composites for Construction, ASCE, 2011, 15 (3): 339-353.