高温下FRP加固钢筋混凝土板非线性分析  

Nonlinear analysis of FRP-strengthened reinforced concrete slabs under fire

作　　者：高皖扬[1] 陆洲导[1] 余江滔[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《哈尔滨工业大学学报》2010年第8期1311-1316,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50578126)

摘　　要：为了给FRP加固钢筋混凝土板的耐火性能研究提供数值计算方法,实现FRP加固板高温下的热-力学耦合分析,在合理选取混凝土、钢筋及FRP材料力学性能参数的基础上,编制了FRP加固板高温下的非线性有限元分析程序,程序的有效性得到了已有试验结果的验证.基于程序对薄涂型防火涂料厚度、载荷比、混凝土板纵筋配筋率、FRP加固量、混凝土板厚及钢筋保护层厚度等对影响加固板跨中位移的相关参数进行计算分析.结果表明:防火涂料厚度、火灾载荷比以及FRP加固量对加固板耐火性能有显著影响;混凝土板厚及钢筋保护层厚度也对火灾下的加固板挠度产生影响;而跨中挠度随混凝土板纵筋配筋率的变化不明显.This paper presented a numerical model of FRP-strengthened reinforced concrete（RC） slabs under fire and conducted the coupled thermo-mechanical analysis.Based on the information about the temperature-dependent mechanical properties of concrete,reinforcing steel and FRP materials,this study developed a nonlinear finite element（FE） code to investigate the fire performance of FRP strengthened RC slabs.The FE code was verified through comparisons with existing fire tests.Based on the code,the effects of intumescent coating thickness,fire load ratio,longitudinal steel reinforcement,amount of FRP strengthening,sectional height and concrete cover on the mid-span deflection of FRP-strengthened RC slabs under fire were considered.The parametric studies show that intumescent coating thickness,fire load ratio and amount of FRP strengthening have significant effects on fire performance of strengthened slabs;sectional height and concrete cover only have moderate influences;and mid-span deflection versus longitudinal steel reinforcement is not obvious.

关 键 词：钢筋混凝土板 FRP加固 防火保护 非线性 热-力学耦合 

分 类 号：TU375.1[建筑科学—结构工程] TU352.5