摘要
采用ABAQUS有限元软件,对钢筋混凝土板的截面温度场进行了分析,选取的标准火灾升温曲线包括ISO 834升温曲线和HC碳氢升温曲线,真实火灾曲线选择欧洲规范EC1建议的的参数化火灾升温曲线。分析结果表明,火灾曲线的升温速率越快,相同时刻混凝土板背火面的温度越高,而随着混凝土板厚度的增大,背火面的温度显著降低。将钢筋混凝土板失去隔热性作为判断耐火极限的条件,计算得到了不同工况下构件的耐火极限,分析了各参数对构件耐火极限的影响规律,给出了不同火灾曲线下钢筋混凝土板达到一级耐火极限90 min所需的最小板厚。
The cross-section temperature distributions of reinforced concrete(RC)slabs were investigated through the finite element(FE)analysis in this study and the FE model was built in ABAQUS.ISO 834 curve and HC curve were adopted as standard fire curves and the parametric fire curves recommended in EC1 were selected as natural fire curves.It is found that the temperature of the unexposed surface of a RC slab increases with the increasing of fire heat rate and decreases with the increasing of slab depth.Fire resistance of a RC slab was defined by the criterion of losing its thermal isolation and the influences of different parameters on the fire resistance of RC slabs were investigated.The minimum depths to achieve the fire resistance requirement of 90 min for RC slabs in various fire curves were proposed.
作者
屈凯
QU Kai(North China Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300381, China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第6期1815-1821,共7页
Bulletin of the Chinese Ceramic Society
基金
国家重点研发计划项目(2017YFC0805000,2017YFC0805002)。
关键词
真实火灾
混凝土板
有限元
温度场
耐火极限
natural fire
reinforced concrete slab
finite element
temperature distribution
fire resistance
