跨中顶撑预应力碳纤维增强复合材料板加固钢筋混凝土梁的试验研究

刘斌; 王虎胜; 杨家琦; 冯鹏; 张启睿; 粟登洋; 汪城

doi:10.13204/j.gyjzG22083007

跨中顶撑预应力碳纤维增强复合材料板加固钢筋混凝土梁的试验研究

doi: 10.13204/j.gyjzG22083007

1. 中国矿业大学(北京), 北京 100083;
2. 清华大学, 北京 100084

基金项目:

中央高校基本科研业务费(2021XJLJ01)

国家自然科学基金青年项目(51908322)

中国矿业大学(北京)越崎杰出学者奖励计划项目(2602021RC59)资助。

详细信息

作者简介:
刘斌,男,2000年出生,硕士研究生。电子信箱:ZQT2100602046@student.cumtb.edu.cn

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出版历程
- 收稿日期: 2022-08-30

Experimental Study on Strengthening RC Beams with Mid-Span Supporting Prestressed Carbon Fiber Plates

1. China University of Mining and Technology (Beijing), Beijing 100083, China;
2. Tsinghua University, Beijing 100084, China

摘要

摘要: 针对预应力碳纤维增强复材(CFRP)板加固钢筋混凝土梁开展了一系列试验研究,对比了现有的外贴预应力加固法和新型跨中顶撑张拉加固法对未损伤梁及损伤梁的加固效果。试验结果表明,新型跨中顶撑张拉加固法可有效提升被加固混凝土梁的开裂荷载和极限承载力,开裂荷载最大提升100%,承载力最大提高48%,均优于传统的外贴预应力加固法。同时,新型加固方法实现了较好的延性,使得用高强弹脆性材料加固的混凝土梁在受弯中产生了较长的屈服平台,为进一步研究高性能材料在结构中的应用提供了参考。
- 预应力 /
- 碳纤维增强复材 /
- 混凝土梁 /
- 加固
Abstract: A series of experimental tests on prestress CFRP plate strengthened RC beams were conducted. The strengthening effect on undamaged beam and damaged beam of two types of strengthening methods, i.e., externally bonded prestressed CFRP and novel mid-span supporting prestressing technique, were investigated. The test results show that the novel strengthening method can enhance both cracking load and ultimate load effectively. The cracking load was enhanced by up to 100%, and the ultimate strength was increased by up to 48%, which had higher efficiency than the conventional method. In addition, the RC beam strengthened by the novel prestressing method had good ductility with a long yield plateau when subjected to bending. Hence, this is a valuable reference for further application of high-performance material in structural engineering.
- prestress /
- CFRP /
- concrete beams /
- strengthening

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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]	本刊编辑部,祝巍.守护桥梁[J].中国公路,2020(7):42-53.
[3]	孙亚男.混凝土建筑结构加固技术分析[J].砖瓦,2021(10):100-101.
[4]	刘宇隆.外包钢加固钢筋混凝土梁的实例应用研究[J].山西建筑,2017,43(27):94-95.
[5]	高荣雄,陈国俱,乐颖,等.体外预应力加固RC梁受力性能试验[J].中国公路学报,2017,30(10):69-80 ,136.
[6]	中国公路学报. 纤维增强复合材料(FRP)及其在桥梁工程中的应用专刊导语[J].中国公路学报,2022,35(2):2.
[7]	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.
[8]	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.
[9]	NORDIN H, TÄLJSTEN B,CAROLIN A. Concrete beams strengthened with prestressed near surface mounted reinforcement (NSFR)[C]//International Conference on FRP Composites in Civil Engineering. 2001.
[10]	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.
[11]	LORENZIS L D,TENG J G. Near-surface mounted FRP reinforcement: an emerging technique for strengthening structures[J]. Composites Part B: Engineering,2007,38(2):119-143.
[12]	GARDEN H N,HOLLAWAY L C. An experimental study of the failure modes of reinforced concrete beams strengthened with prestressed carbon composite plates[J]. Composites Part B Engineering, 1998, 29(4):411-424.
[13]	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.
[14]	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.
[15]	KALFAT R,AL-MAHAIDI R, SMITH S T. Anchorage devices used to improve the performance of concrete structures retrofitted with FRP composites: a state-of-the-art review[J]. Journal of Composites for Construction, 2013, 17:14-33.
[16]	SMITH S T, HU S, KIM S, et al. FRP-strengthened RC slabs anchored with FRP anchors[J]. Engineering Structures, 2011, 33(4): 1075-1087.
[17]	KLAIBER F W, WIPF T J, FANOUS F S. Strengthening of two continuous-span steel stringer bridges[J]. 1998, 12(2/3):151-159.
[18]	REFAI A E. Monotonic and fatigue flexural performance of RC beams strengthened with externally post-tensioned CFRP tendons[D]. Waterloo: University of Waterloo, 2007.
[19]	卓静.高强度复合材料FRP片材波形齿夹具锚锚固系统及应用研究[D].重庆: 重庆大学,2005.
[20]	中华人民共和国住房和城乡建设部.纤维增强复合材料工程应用技术标准:GB 50608—2020[S].北京:中国计划出版社,2020.