碳纤维布加固钢筋混凝土板的耐火极限分析  

Analysis of Fire Endurance of Reinforced Concrete Slabs Strengthened with Carbon-Fiber-Sheets

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：《工程抗震与加固改造》2009年第5期14-22,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：十一五国家科技支撑计划子课题(2006BAJ03A03-12);教育部新世纪优秀人才支持计划项目(NCET-04-0819);亚热带建筑科学国家重点实验室重点研究项目(2008ZA10)

摘　　要：编制了碳纤维布加固钢筋混凝土板的高温全过程分析程序,程序的有效性得到了试验结果的初步验证。针对不同构件尺寸、防火涂料厚度、受拉纵筋配筋率、碳纤维布加固量、混凝土保护层厚度、荷载比等共计6400种工况,进行了碳纤维布加固钢筋混凝土板的高温反应分析,考察了各主要参数对该类加固构件耐火极限的影响规律。在此基础上,建立了该类加固构件耐火极限的实用计算方法。研究结果表明:高温下碳纤维布加固钢筋混凝土板的耐火极限随板的厚度、防火涂料厚度和混凝土保护层厚度的增加逐渐增大,而随碳纤维布加固量和荷载比的增加逐渐减小;其中荷载比的影响最为显著,受拉纵筋配筋率对该类加固构件的耐火极限影响较小。A computer program for fire performance analysis of RC slabs strengthened with carbon fiber sheets is developed, and the program is verified by comparing the numerical results with the test data. The influence of some parameters （i. e., sectional dimension, thicknesses of fire insulation, reinforcement ratio, strengthening ratio, thicknesses of concrete cover, and load ratio） on fire endurance of the strengthened RC slabs is analyzed extensively. Based on the simulation results, a simplified formula is proposed to determine the fire endurance of RC slabs strengthened with carbon fiber sheets. It can be found that the fire endurance of the strengthened RC slabs increases with an increasing of the thickness of slab, the thicknesses of fire insulation and the thicknesses of concrete cover, and decreases with an increasing of the strengthening ratio and the load ratio. The effect of the reinforcement ratio on the fire endurance of the strengthened RC slabs is limited.

关 键 词：碳纤维布 加固 钢筋混凝土 板 耐火极限 

分 类 号：TU375.1[建筑科学—结构工程]