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首页> 外文期刊>Journal of structural fire engineering >A study on different techniques of restoration of fire damaged reinforced concrete flexural members
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A study on different techniques of restoration of fire damaged reinforced concrete flexural members

机译：火灾破坏钢筋混凝土受弯构件不同修复技术的研究

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Purpose - The main aim of this research was to investigate the effectiveness of various strengthening techniques in restoring the structural performance of reinforced concrete (RC) beams damaged by elevated temperatures. Design/methodology/approach - Three different strengthening techniques, namely, high-strength fibre reinforced concrete (HSFRC), ferrocement (FC) jacketing and externally bonded fibre-reinforced polymer (FRP) were used. Series of RC beams were casted, heated, strengthened and tested to investigate the influence of various variables. The variables of the study were type of strengthening and level of heat damage. Findings - Externally bonded FRP was found to be the best among the various techniques, especially with respect to strength and stiffness restoration. On the contrary, the FRP strengthening was not that effective in restoring the energy absorption capacity of beams compared to HSFRC and FC techniques of strengthening. The chosen strengthening techniques were able to restore the failure mode of beams to flexural failure, which was found to have changed to shear failure in case of heated unstrenghthened beams. Originality/value - This research program has contributed to the fundamental understanding of designing post fire retrofit solutions for RC beams.
机译：目的-这项研究的主要目的是研究各种加固技术在恢复受高温破坏的钢筋混凝土（RC）梁的结构性能方面的有效性。设计/方法/方法-使用了三种不同的加固技术，即高强度纤维增强混凝土（HSFRC），高铁（FC）护套和外部粘结的纤维增强聚合物（FRP）。对一系列RC梁进行浇铸，加热，加固和测试，以研究各种变量的影响。研究的变量是强化类型和热损伤水平。研究结果-在各种技术中，特别是在强度和刚度恢复方面，外部粘结的FRP被认为是最好的。相反，与HSFRC和FC加固技术相比，FRP加固在恢复梁的能量吸收能力方面效果不佳。选择的加固技术能够将梁的破坏模式恢复为弯曲破坏，发现在加热未增强梁的情况下，该模式已变为剪切破坏。原创性/价值-该研究计划对设计RC梁的火灾后改造解决方案有了基本的了解。

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