高温下CFRP加固RC梁升温分布及钢筋退化分析  

Temperature Distribution and Steel Strength Degradation about CFRP Reinforced Concrete Beam under Extremely Hot

作　　者：黄宝涛[1,2] 李洁[1,2] 王林[1] 王丽艳[1] 陈文文[1] 

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212003 [2]江苏科技大学道路材料与桥梁加固技术交通行业实验室,江苏镇江212005

出　　处：《工程抗震与加固改造》2014年第4期116-121,130,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51109099);江苏高校自然基金(12KJB580003);江苏省创新基金(BY2012182)

摘　　要：为了研究不同防火涂层厚度工况下CFRP加固RC梁在火灾高温下的性能退化规律,运用三维数值分析方法,计算了不同厚度防火层的梁截面温度场分布及钢筋退化情况。计算表明,截面温度场在钢筋附近形成温度集中区,无防火层时纵筋温度迅速升高,性能退化迅速;随着防火层厚度的增加,钢筋强度退化时间逐渐延长。研究成果对CFRP加固钢筋混凝土结构在高温下的力学性能、耐火极限及结构防火设计具有参考意义。In order to investigate the influence law of CFRP reinforced concrete beam using inorganic gel under extremely hot condition, three-dimensional numerical analysis method is used in this paper. The temperature distribution and steel strength degradation of the beam cross section under different thicknesses of fire protection layer are calculated. The results shows that the distribution forms areas of temperature around reinforcement cages, the longitudinal reinforcement temperature rises rapidly as well as strength depredates when it is no fire protection layer; with the fire protection layer thickness increasing, the steel strength degradation time is extended. The research results have some significations reference for the fire resistance and fire-protection design of CFRP reinforced concrete structures.

关 键 词：结构工程 性能退化 钢筋混凝土梁 

分 类 号：TU375[建筑科学—结构工程]