BTRC和BRRC加固混凝土梁抗冲击性能试验研究
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作者:
作者单位:

1.天津城建大学天津市土木结构保护加固重点实验室;2.中铁一局集团天津建设工程有限公司

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中图分类号:

TU599

基金项目:

天津市教委科研计划项目(20140909)


Experimental Studies on the Impact Properties of RC Beams Reinforced with BTRC and BRRC
Author:
Affiliation:

1.Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin Chengjian University;2.Tianjin Construction Engineering Co,Ltd of China Railway First Engineering Group

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    摘要:

    采用落锤冲击试验机,开展了普通钢筋混凝土梁、玄武岩纤维网增强混凝土(BTRC)和玄武岩纤维筋(BRRC)加固梁的抗冲击性能试验研究。其中,未加固钢筋混凝土梁1根,采用不同面积BTRC和BRRC加固的钢筋混凝土梁各2根。通过分析失效破坏过程,冲击力、支座反力、位移时程曲线,冲击力-挠度曲线以及支座反力-挠度曲线,对BTRC和BRRC加固钢筋混凝土梁的抗冲击性能进行了研究。结果表明,BTRC和BRRC加固层可以有效提高试验梁的抗冲击承载力,减小试验梁的峰值最大变形和残余变形;加固方式和配筋率/配网率对试验梁的最大变形和残余变形影响不明显;加固层中纤维网断裂和纤维筋锚固端脱粘可消耗部分锤头动能,使得加固梁的整体变形耗能占比要低于普通钢筋混凝土梁。

    Abstract:

    Drop hammer test was carried out on five reinforced concrete (RC) beams which include one as-built RC beam, two RC beams reinforced with different amount of basalt fiber rebar (BRRC) and two RC beams reinforced with different amount of basalt textile (BTRC). The damage process, impact force, reaction force, deformation time history, impact force-deformation curve and reaction force-deformation curve were analyzed to study the impact-resistant behavior of the RC beams reinforced with BTRC or BRRC. Results indicate that BTRC and BRRC can significantly increase the impact load-carrying capacity, thus decreasing the peak deformation and residual deformation of the beams. The reinforcement strategies and FRP amount have little influence on the deformation of the beams. Part of the kinematic energy of the drop hammer can be dissipated due to the propagation of the cracks between the reinforcement layer and the concrete, resulting in lower internal energy of the reinforced beams in comparison with that of the as-built RC beam.

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  • 收稿日期:2021-04-17
  • 最后修改日期:2021-08-03
  • 录用日期:2021-08-30
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