薄壁槽型钢-混凝土梁在标准火灾下的温升特性  

Research on elevated temperature properties of thin-walled U-section steel-concrete beams under ISO-834 fire

作　　者：高轩能[1] 陈明华[1] 王进[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《福州大学学报（自然科学版）》2008年第3期430-435,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(2006J0445);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：对薄壁槽型钢-混凝土组合梁在标准火灾下的温度响应及耐火性能进行研究.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热分析程序,对薄壁槽型钢-混凝土构件在火灾下的温度场进行分析与计算.结果表明,在ISO-834标准升温曲线下,组合梁截面的温度分布是不均匀的,单纯地用给定临界温度来判定构件是否失效不合理.此外,填充混凝土能有效改善钢构件的温度场变化规律,在升温前期,填充混凝土的薄壁槽型钢-混凝土组合梁的温度显著低于未填充的型钢梁,降幅达30%-60%.This paper studied temperature response and fire - resistant characteristic of the thin - walled U- section steel-concrete composite beams under standard fire. Through the combination of the finite element method in space and finite difference method in time, the temperature fields of the composite beams under fire were numerically simulated and analyzed with thermal - analysis ANSYS program. The results showed that the temperature distribution of the composite beam sections is nonuniform subjected to ISO -834 standard fire and that it is unreasonable to judge the structure whether fails or not only by given critical -temperature. In addition, the concrete fill effectively improved the elevated temperature properties of the thin - walled steel and reduced the temperature, of steel. In early stage of temperature rising, the temperatures of the thin - wailed U - section steel - concrete composite beams are lower than that of unfilled thin - wailed steel and the temperature reduction could reach 30% - 60%.

关 键 词：火灾 薄壁槽型钢 混凝土 组合梁 温升特性 

分 类 号：TU352.5[建筑科学—结构工程] X932[环境科学与工程—安全科学]