HB-FRP加固20m-T截面桥梁梁的性能评价

IF 1.6 Q3 ENGINEERING, CIVIL
Leisheng Zhou, Han Wang, Shichao Zhu, Jinyi Liu, Ying Zhu
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引用次数: 0

摘要

基于单元法和直接法建立了含初始裂纹的多T梁有限元模型。采用单元法对纤维增强塑料(FRP)与混凝土界面的粘结性能进行了评价。另一方面,直接法引入了弹性断裂力学的基本理论,计算了初始裂纹的裂尖能量释放率。此外,还讨论了混合粘结FRP(HB-FRP)加固前后的裂纹扩展风险。模拟结果表明,在交通荷载作用下,在没有初始裂缝的情况下,FRP-混凝土界面的粘结应力很小,但在梁跨中的弯曲裂缝处更容易发生中间裂缝(IC)脱胶。利用机械紧固件的功能,在超载小于设计交通荷载4倍的情况下,界面脱粘得到抑制。此外,研究表明,裂纹越高,裂纹尖端的G I值越大,这意味着裂纹越不稳定,越容易扩展。此外,初始裂纹越高,HB-FRP补强对裂纹扩展的抑制作用越弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance evaluation of a 20m-T Section bridge beam strengthened by HB-FRP
ABSTRACT The multi T-beam finite element model with an initial crack was generated based on the element and direct methods. The element method was used to evaluate the bonding performance of the fibre reinforced plastic (FRP)-to a concrete interface. On the other hand, the direct method introduced the basic theory of elastic fracture mechanics and calculated the crack tip energy release rate of the initial crack. In addition, the crack propagation risk before and after hybrid bonding FRP (HB-FRP) reinforcement was discussed. The simulation results showed that under traffic load, the bonding stress of FRP-concrete interface is very small in the absence of an initial crack, but the intermediate crack (IC) debonding is easier occurred at the flexural crack of the beam mid-span. With the function of the mechanical fastener, the interface debonding was suppressed with regard to overloading less than 4 times the design traffic load. Furthermore, it was shown that the higher the crack was, the greater the G I value was at the crack tip, which means a more unstable the crack was, and the easier it was to propagate. Also, the higher the initial crack was, the weaker the effect of HB-FRP reinforcement was in suppressing crack propagation.
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来源期刊
CiteScore
3.90
自引率
7.70%
发文量
31
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