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首页> 外文期刊>Composite Structures >Axial compressive behavior of damaged steel and GFRP bars reinforced concrete columns retrofitted with CFRP laminates
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Axial compressive behavior of damaged steel and GFRP bars reinforced concrete columns retrofitted with CFRP laminates

机译：损坏钢材和GFRP棒钢筋混凝土柱的轴流压缩行为用CFRP层压板改装

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摘要

In reinforced concrete (RC) structures, Glass Fiber Reinforced Polymer (GFRP) bars have gained wide acceptance as an alternative to steel bars in coastal and corrosive environments. The majority of studies focused on the axial compressive behavior of undamaged GFRP bars RC columns, comprehensive research on the axial compressive behavior of retrofitted GFRP bars RC has not been conducted because of the limitations of available design codes. This study investigates the axial compressive behavior of damaged GFRP reinforced columns confined with the carbon-FRP (CFRP) sheet. A total of 14 short circular RC columns were fabricated. Seven columns were reinforced with GFRP bars and the remaining seven columns were reinforced with steel bars. Firstly, all the columns were tested under different axial compression conditions until a 35% drop in the peak strength and then these columns were retrofitted with CFRP fabric. The test parameters comprise of testing retrofitted columns under concentric and eccentric loadings. The influence of these parameters on the mode of failure and the ultimate load and displacement conditions of the retrofitted specimens were carefully analyzed. The results revealed that the externally bonded CFRP technique can significantly improve the ultimate axial strength and displacement capacities of damaged GFRP reinforced columns.
机译：在钢筋混凝土（RC）结构中，玻璃纤维增​​强聚合物（GFRP）条在沿海和腐蚀性环境中的钢筋替代方案获得了广泛的验收。大多数研究专注于未损坏的GFRP条RC柱的轴向压缩行为，由于可用设计代码的限制，尚未进行对改装GFRP条RC的轴向压缩行为的综合研究。本研究研究了损坏的GFRP增强柱限制碳-FRP（CFRP）片的轴向压缩行为。共制备了14个短圆形RC柱。用GFRP棒加固七柱，剩下的七柱用钢筋加固。首先，在不同的轴向压缩条件下测试所有柱，直到峰强度的35％下降，然后用CFRP织物改装这些柱。测试参数包括在同心和偏心载荷下测试改装的柱。这些参数对故障模式的影响以及改造标本的最终负载和位移条件的影响。结果表明，外部键合的CFRP技术可以显着提高损坏的GFRP增强柱的终极轴向强度和位移能力。

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