碳纤维布加固钢筋混凝土板的耐火性能试验研究  

Experimental study on reinforced concrete slabs strengthened with carbon-fiber-sheets and subjected to high temperatures

作　　者：吴波[1] 王军丽[1] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《土木工程学报》2007年第6期26-31,41,共7页China Civil Engineering Journal

基　　金：教育部新世纪优秀人才支持计划项目(NCET-04-0819)

摘　　要：在ISO834标准升温条件下,进行3块设置不同防火材料的碳纤维布加固钢筋混凝土板,以及1块未加固板的耐火性能对比试验。分析不同防火措施对高温下碳纤维布加固钢筋混凝土板的破坏形态、跨中挠度及耐火极限的影响。试验结果表明:(1)只要采取适当的防火措施,在使用荷载明显增大的情况下,碳纤维布加固钢筋混凝土板仍具有与未加固板大体相当甚至更长的耐火极限;(2)与薄型防火涂料相比,水泥砂浆的防火保护效果相对较弱;(3)厚度5 mm的薄型防火涂料的防火效果相对较好。为确保实际工程中碳纤维布加固钢筋混凝土板具有足够的耐火能力,科学合理地选择防火材料及其厚度是十分重要的。The fire resistance performance of three reinforced concrete （RC） slabs strengthened with carbon-fiber-sheets and covered with different insulating materials are tested, following the ISO834 standard heating process, and the test results are compared with those of an unstrengthened RC slab. The influences of different insulating measures on the failure mode, deflection at mid-span, and fire resistance of the strengthened RC slabs are analyzed. The test results indicate that： （a）when insulating measures are adopted appropriately, even though the service loading is increased significantly, the fire resistance of the RC slabs strengthened with carbon-fiber-sheets may be approximately equal to or longer than that of the unstengthened slab; （b）the insulation effectiveness of cement mortar is weaker than that of scraping insulation materials; and（c）the insulation effectiveness of scraping insulation material with a thickness of 5mm is better than that of 3mm. In order to ensure that RC slabs strengthened with carbon-fiber-sheets possess sufficient fire resistance capacity, it is important to carefully choose the type and thickness of insulating materials.

关 键 词：碳纤维布 加固 钢筋混凝土板 耐火性能 

分 类 号：TU375.2[建筑科学—结构工程] TU352.5