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High Temperature Residual Properties of Externally-Bonded FRP Systems

机译:外部粘结FRP系统的高温残留特性

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摘要

The use of externally-bonded FRP plates and sheets to strengthen existing reinforced concrete structures is now widely recognized. However, a primary concern that still discourages the use of FRPs in some cases is their assumed susceptibility to fire. While recent studies have demonstrated that the overall performance of appropriately designed and insulated FRP-strengthened reinforced concrete members is satisfactory, the specific behavior of FRP materials at high temperature and after exposure to high temperature remains largely unknown, particularly for externally-bonded FRP strengthening systems. As a first step in an effort to learn more about the high temperature properties of these systems, an initial series of tests is presented to study the high temperature residual properties of externally-bonded carbon and glass FRP systems for concrete. Axial tension tests, single-lap bond tests, thermogravimetric analysis, and differential scanning calorimetry are all used to elucidate high temperature residual performance. The potential consequences of these initial results for the fire-safe design of FRP-strengthened reinforced concrete members are discussed.
机译:现在,广泛认可使用外部粘结的FRP板和板来增强现有的钢筋混凝土结构。但是,在某些情况下仍然不鼓励使用FRP的主要问题是假定的易燃性。尽管最近的研究表明,经过适当设计和绝缘的FRP加固的钢筋混凝土构件的总体性能令人满意,但是FRP材料在高温下以及暴露于高温后的具体性能仍然未知,尤其是对于外部粘结的FRP加固系统。作为努力更多地了解这些系统的高温特性的第一步,我们提出了一系列初始测试,以研究用于混凝土的外部粘结碳纤维和玻璃纤维增​​强塑料系统的高温残余特性。轴向张力测试,单搭接测试,热重分析和差示扫描量热法均用于阐明高温残留性能。讨论了这些初步结果对FRP加固的钢筋混凝土构件的防火设计的潜在后果。

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