复材加固钢筋混凝土梁抗火研究的发展现状

A STATE-OF-THE-ART REVIEW OF FIRE RESISTANCE OF RC BEAMS STRENGTHENED BY FRP

纤维增强复合材料加固钢筋混凝土结构技术相比于传统加固技术具有很多技术优势,近年来已经形成了较大规模的实际工程应用。其加固方法主要包括外贴复材片材加固法、嵌入式复材加固法和复材网格加固法。当复材用于建筑物加固时必须满足建筑防火设计标准的要求,故明确复材加固钢筋混凝土梁的抗火性能是该项技术用于建筑结构加固的重要前提。对国内外的相关研究成果进行了综述,包括复材在高温下的基本力学性能、复材与混凝土在高温下的黏结性能、复材加固钢筋混凝土梁的耐火试验、复材加固钢筋混凝土梁抗火性能的有限元模拟、复材加固钢筋混凝土梁受火后的剩余承载力、复材加固钢筋混凝土梁的抗火设计方法,从而系统地阐明了复材加固钢筋混凝土梁的抗火性能。

The technology of fiber reinforced polymer(FRP)strengthened reinforced concrete structures has many advantages compared to the traditional strengthening technology,and it has been widely used in many practical engineering in recent years.The strengthening method mainly consists of externally bonded FRP sheets,near-surface mounted FRP bars and FRP grids strengthening.When FRP is used for strengthening buildings,it must meet the requirements of fire resistance standard of buildings.Thus understanding the fire resistance of reinforced concrete beams strengthened with FRP is an important precondition for using this technology into structural strengthening of buildings.This paper presented a state-of-the-art review on the relevant research results at home and abroad,which includes the basic mechanical properties of FRP at high temperature,the bond performance of FRP to concrete at high temperature,the fire tests of FRP strengthened RC beams,the finite element simulation of fire performance of FRP strengthened RC beams,the residual strength of FRP strengthened RC beams,and the fire resistance design of FRP strengthened RC beams.The fire resistance of RC beams strengthened by FRP was systematically illustrated.