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首页> 外文会议>Canadian Society for Civil Engineering annual conference >POST-FIRE RESIDUAL STRENGTH OF GLASS FIBRE REINFORCED POLYMER (GFRP) BARS
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POST-FIRE RESIDUAL STRENGTH OF GLASS FIBRE REINFORCED POLYMER (GFRP) BARS

机译：玻璃纤维增​​强聚合物（GFRP）棒的火灾剩余强度

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摘要

Lack of reliable and adequate information on material characteristics of glass fibre reinforced polymer (GFRP) at elevated temperatures lowers the accuracy of analytical and design models developed to predict the behaviour of GFRP reinforced concrete members. There is an essential need to assess the remaining strength of bridge and building components after exposure to fire to determine if repair or replacement is required. This paper presents experimental results of a series of tensile tests on GFRP reinforcing bars after exposure to elevated temperatures. GFRP specimens with nominal diameter of 16 mm were exposed to different temperatures in an electric furnace. During the heat exposure, the samples were loaded with 25 % of their ultimate tensile strength to simulate the sustained load that a reinforcing bar in a concrete member may carry in a fire incident. After the samples cooled to room temperature, they were loaded to failure. The same type of GFRP bars had been tested earlier by the authors under simultaneous effects of heat and load. At high temperature, the bars had considerable strength loss. However, the results presented in this paper show notable tensile strength recovery when the specimens were cooled before loading to failure. This information is essential for studying the post-fire evaluation of GFRP reinforced concrete members exposed to fires.
机译：升高温度下缺乏可靠和充分的材料特性关于玻璃纤维增​​强聚合物（GFRP）的材料特性，降低了开发的分析和设计模型的准确性，以预测GFRP钢筋混凝土构件的行为。在暴露于火灾后，有必要评估桥梁和建筑部件的剩余强度，以确定是否需要修复或更换。本文介绍了在暴露于高温后GFRP增强条上的一系列拉伸试验的实验结果。具有标称直径为16 mm的GFRP样品暴露于电炉中的不同温度。在热暴露期间，将样品装入其最终拉伸强度的25％以模拟混凝土构件中的加强杆可以携带火灾事件的持续载荷。在将样品冷却至室温后，将它们装载到失败。作者在同时对热量和载荷的影响之前，提前测试了相同类型的GFRP棒。在高温下，棒具有相当大的强度损失。然而，本文中提出的结果表明，当在装载到失败之前将样品冷却时，显着的拉伸强度恢复。该信息对于研究暴露于火灾的GFRP钢筋混凝土构件的火灾后评估至关重要。

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