建筑结构学报2012，Vol.33Issue(5)：133-140,8.
冷弯薄壁槽钢-混凝土组合梁抗火性能参数分析
Parametric analysis of fire-resistant behavior of cold-formed thin-walled channel steel concrete beam
摘要
Abstract
Based on the thermal ANSYS analysis, a numerical model for fire-structure coupling analysis of the cold- formed thin-walled channel steel concrete beam under the standard fire is established. The fire-resistant behavior of the composite beam in different influence factors, including the static loading level, the concrete strength, the channel steel section geometry, the fire protection coating thickness, the loading location and the loading pattern, were numerically simulated and analyzed. The numerical results show that the effects of the fire protection coating thickness and the loading level on the fire-resistant of composite beam are significant. The influence of the height and the thickness of channel steel web also should be considered. The concrete strength, the loading location and the loading pattern have little effect on the fire-resistance of the composite beam and can be neglected. The results also show that the fire-resistance of the composite beam will be reduced with the loading level increases for a certain fire protection coating thickness and it will nonlinearly increase with the fire protection coating thickness increases for a certain loading level. The filled concrete can effectively reduce the temperature of the steel beam section and result in temperature elevation delay effect. In the early stage of temperature elevation, the temperatures of the cold-formed thin-walled channel steel concrete beam are lower than those of unfilled channel steel beam, and the temperature reduction may reach 15% - 60%. In the ISO-834 fire the mid-span deflection 8 = 1/25 can be used as the criterion to determine the fire resistance of the composite beam.关键词
组合梁/冷弯薄壁槽钢/有限元分析/抗火性能/参数分析Key words
composite beam/cold-formed thin-walled channel steel/finite element analysis/fire-resistant behavior/parametric analysis分类
建筑与水利引用本文复制引用
高轩能,黄文欢,朱皓明..冷弯薄壁槽钢-混凝土组合梁抗火性能参数分析[J].建筑结构学报,2012,33(5):133-140,8.基金项目
国家自然科学基金项目（51008133）,福建省自然科学基金项目（2011J01319）,中央高校科研业务费专项基金项目（JB-JC1005）. （）
