标准火灾下U型钢-混凝土梁的耐火性能  

Fire-resistant behavior of U-section steel-concrete beam exposed to standard fire

作　　者：高轩能[1] 朱皓明[1] 黄文欢[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《合肥工业大学学报（自然科学版）》2011年第8期1207-1211,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51078127);福建省科技计划重点资助项目(2006H0030);厦门市科技计划资助项目(3502Z20073036)

摘　　要：为了研究U型钢-混凝土组合梁的耐火性能,文章采用在空间上运用有限单元与在时间上运用有限差分相结合的方法,应用ANSYS编制热分析程序,对组合梁在ISO-834标准火灾下的温度场进行了分析与计算。结果表明,在ISO-834标准火灾下,填充混凝土使U型钢-混凝土组合梁截面的温度分布不均匀,该梁的耐火特性显著优于普通型钢-混凝土组合梁,单纯地用给定临界温度来判定组合梁是否达到耐火极限不合理。此外,填充混凝土可有效降低钢梁截面的温度,产生温升延时效应,在升温前期,U型钢-混凝土组合梁的温度低于未填充混凝土的型钢梁,降幅可达15%~60%,温升延时可达约15 min。To research the fire-resistant behavior of U-section steel-concrete composite beam in fire,the temperature fields of the composite beams under ISO-834 standard fire were numerically simulated and analyzed with ANSYS thermal analysis program by integrating the finite element method in space and the finite difference method in time.The results show that the temperature distribution of the U-section steel-concrete composite beam section in ISO-834 fire is nonuniform due to the filled concrete.The fire-resistant behavior of the U-section steel-concrete composite beam is significantly better than the ordinary steel-concrete composite beam and it is unreasonable to judge whether the composite beam reaches the limit of fire resistance simply with given critical temperature.The filled concrete effectively reduces the temperature of steel beam section and results in the time-delay of temperature elevation.In prophase of temperature elevation,the temperature of U-section steel-concrete composite beam is lower than that of concrete-unfilled U-section steel beam,and the temperature reduction may reach 15%～60% and the temperature elevation time may delay about 15 min.

关 键 词：ISO-834标准火灾 U型钢 组合梁 耐火性能 温度场 

分 类 号：TU352.5[建筑科学—结构工程] TU398