基于FDS-ABAQUS模拟移动火灾下的钢构件升温  

Simulation of Steel Component Temperature Rise under Traveling Fire Based on FDS-ABAQUS

作　　者：邵海斌 Haibin Shao(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai)

机构地区：[1]上海理工大学环境与建筑学院,上海

出　　处：《建模与仿真》2025年第2期261-267,共7页Modeling and Simulation

摘　　要：传统火灾分析中温度场通常被假定为均匀分布,采用标准升温曲线进行模拟,这与实际火灾场景中的非均匀温度分布存在显著差异。通过FDS-ABAQUS耦合分析方法,结合绝热表面温度(AST)法实现火灾场景向结构传热分析的过渡,研究了移动火灾下钢构件的温度场分布特性。数值模型经NIST局部火灾试验数据验证,结果表明该方法能够准确预测构件的温度场分布和变形特征。对250×250×8×8 mm矩形截面钢管在快速移动火灾工况(传播速度2.5 mm/s,热释放速率5 MW)下进行3600s模拟分析,发现移动火灾作用下钢构件温度场呈现显著非均匀性,最高温度出现在1950~2000 s期间,构件中心位置温度超过950℃温度场分布具有明显的动态特征,验证了传统均匀温度场假设的局限性。研究成果为大空间钢结构建筑的抗火设计提供了重要的理论依据和数值计算基础。Traditional fire analysis usually assumes uniform temperature field distribution and employs standard temperature-time curves for simulation,which significantly differs from non-uniform temperature distribution in actual fire scenarios.The temperature field distribution characteristics of steel components under traveling fire were investigated using FDS-ABAQUS coupled analysis with Adiabatic Surface Temperature(AST)method to bridge the transition from fire scenario to structural heat transfer analysis.The numerical model was validated against NIST localized fire test data,demonstrating its accuracy in predicting temperature field distribution and deformation characteristics.A rectangular steel tube(250×250×8×8 mm)was simulated under rapid traveling fire conditions with a propagation speed of 2.5 mm/s and heat release rate of 5 MW for 3600 s.Results revealed significant non-uniformity in the temperature field under traveling fire,with peak temperatures exceeding 950˚C at the component center during 1950~2000 s.The temperature field distribution exhibited distinct dynamic characteristics,verifying the limitations of traditional uniform temperature field assumptions.The research findings provide important theoretical basis and computational foundation for fire-resistant design of large-space steel structures.

关 键 词：移动火灾 钢构件 AST温度 数值模拟 

分 类 号：TU391[建筑科学—结构工程]