[1]张亚芳,段莉斌,卢娟,等.冲击速度对CFRP加固RC梁动态性能的影响[J].深圳大学学报理工版,2022,39(6):622-628.[doi:10.3724/SP.J.1249.2022.06622]
 ZHANG Yafang,DUAN Libin,LU Juan,et al.Influence of impact velocity on dynamic performance of reinforced concrete beams strengthened with CFRP[J].Journal of Shenzhen University Science and Engineering,2022,39(6):622-628.[doi:10.3724/SP.J.1249.2022.06622]
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冲击速度对CFRP加固RC梁动态性能的影响()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第39卷
期数:
2022年第6期
页码:
622-628
栏目:
土木与建筑工程
出版日期:
2022-11-15

文章信息/Info

Title:
Influence of impact velocity on dynamic performance of reinforced concrete beams strengthened with CFRP
文章编号:
202206002
作者:
张亚芳段莉斌卢娟霍永杰
广州大学土木工程学院,广东广州 510006
Author(s):
ZHANG Yafang DUAN Libin LU Juan HUO Yongjie
School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong Province, P.R.China
关键词:
复合材料 碳纤维增强复合材料 钢筋混凝土梁 落锤试验 冲击速度 抗冲击性能 能量耗散
Keywords:
composite materials carbon fiber reinforced plastics reinforced concrete beam drop test impact velocity impact resistance energy dissipation
分类号:
TB333
DOI:
10.3724/SP.J.1249.2022.06622
文献标志码:
A
摘要:
为研究不同冲击速度下碳纤维增强复合材料(carbon fiber reinforced plastics, CFRP)加固钢筋混凝土(reinforced concrete, RC)梁的抗冲击性能和动态损伤规律,采用落锤试验机,对4根CFRP加固RC梁进行冲击试验.对加固梁的破坏模式、裂缝扩展规律、动态时程响应和能量耗散进行分析,结果表明:随着冲击速度的增加,CFRP加固梁的跨中主弯曲裂缝宽度先增大后减小,跨中主斜裂缝宽度则一直增大,整体裂缝分布向跨中区域聚拢;峰值冲击力和跨中峰值位移与冲击速度呈线性关系,跨中位移的发展经历了线性增长、非线性增长、回弹和平稳4个阶段;加固梁的耗能能力随冲击速度的增加呈非线性增长;冲击速度越大,加固梁耗能能力的增长幅度越小.研究可为CFRP加固RC梁的优化设计提供参考.
Abstract:
In order to study the impact resistance and dynamic damage rule of reinforced concrete (RC) beams strengthened with carbon fiber reinforced plastics (CFRP) under different impact velocity, four CFRP strengthen- ed RC beams were tested by using a drop-hammer impact device. The analysis results of the failure pattern, crack propagation rule, dynamic time history response and energy dissipation of the strengthened beams show that with increase of the impact velocity, the width of the main bending crack in the mid-span of CFRP strengthened beam increases first and then decreases, and the width of the main oblique crack in the mid-span increases continuously. It can also be identified that overall crack distribution converges to the mid-span area. Furthermore, the peak impact force and the mid-span peak displacement are linearly dependent to the impact velocity. The energy dissipation capacity of strengthened beams increases nonlinearly with the increase of impact velocity. The greater the impact velocity is, the less energy dissipation capacity of the strengthened beam can increase. In addition, four stages can be divided in the test based on development of mid-span displacement, which are linear growing, nonlinear growing, rebounding and stable stages, respectively. The study can provide reference for optimal design of RC beams strengthened with CFRP.

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更新日期/Last Update: 2022-11-30