局部火灾场景钢柱传热的试验与数值模拟研究  

Experimental and Numerical Simulation Study of Heat Transfer in Steel Columns for Localized Fire Conditions

作　　者：周靖罡 周晅毅[1] 王伟[1] 丛北华[2] ZHOU Jinggang;ZHOU Xuanyi;WANG Wei;CONG Beihua(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Institute of Disaster Prevention and Relief,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾减灾全国重点实验室,上海200092 [2]同济大学上海防灾救灾研究所,上海200092

出　　处：《结构工程师》2025年第2期120-129,共10页Structural Engineers

基　　金：国家自然科学基金项目(52078380);国家自然科学基金重点国际合作项目(51820105013)。

摘　　要：目前的结构抗火研究中针对局部真实火灾场景的研究相对较少,试验结果相对匮乏。本文搭建了局部火灾试验平台,并采用射流火与池火两种火源形式对H型钢柱进行加热,记录其温度结果。在数值模拟方面,有别于应用绝热表面温度概念的迭代耦合方法,本文通过将火灾分析模块与热分析模块统一采用CFD方法开展来实现流固传热的双向直接耦合。在火灾模块中探究了空间速度场与温度场的分布规律,在热模块中探究了钢柱在不同火源环境下的受热特点,并通过试验数据与模拟结果的比对验证了直接耦合方法的正确性。此外,还分别应用理论公式与经验公式对钢柱壁面对流换热系数分布规律进行了探讨。The current structural fire resistance research has relatively few studies for localized fire scenarios,and the test results are relatively scarce.Based on this,this paper attempts to build a realistic fire test platform,and adopts two fire source forms,jet fire and pool fire,to heat the H-shaped columns and record its thermal results.In terms of numerical simulation,unlike the iterative coupling method that applies the concept of adiabatic surface temperature,this paper realizes the two-way direct coupling of fluid-solid heat transfer by unifying the fire analysis with the thermal analysis using the CFD method.The distribution rules of the spatial velocity field and temperature field were explored in the fire analysis model,and the thermal characteristics of steel columns in different fire source environments were explored in the thermal model.The correctness of the direct coupling method was verified by comparing experimental data with simulation results.In addition,the theoretical and empirical formulas are applied to explore the distribution law of convective heat transfer coefficient of the steel column surface.

关 键 词：计算流体动力学(CFD) 局部火灾 钢柱 对流换热系数 

分 类 号：TU312.1[建筑科学—结构工程]