火灾环境下钢结构响应行为的FDS-ABAQUS热力耦合方法研究  

A STUDY OF THERMAL-MECHANICAL COUPLED METHOD OF ANALYZING STEEL STRUCTURES' THERMAL RESPONSE IN FIRE BASED ON FDS-ABAQUS

作　　者：段进涛 史旦达[1] 汪金辉[1] 焦宇[1] 何佩珊[1] 

机构地区：[1]上海海事大学海洋科学与工程学院,上海201306

出　　处：《工程力学》2017年第2期197-206,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51109127;50909058);上海市自然科学基金项目(16ZR1414600);上海海事大学学术创新团队基金项目(A2-0201150404);上海市研究生教育创新计划实施项目学位点建设培育项目(20131129)

摘　　要：火灾环境下钢结构热力耦合分析普遍采用ISO834标准升温曲线(或火灾升温经验公式)描述结构的升温过程,然而这种方法并不能准确描述真实火灾环境下结构的升温过程。为了分析钢结构在真实火灾温度场下的热响应行为,该文以整体结构作为研究对象,提出了基于FDS和ABAQUS的火-热-结构耦合分析方法。该方法通过创建FDS-ABAQUS耦合接口,将FDS模拟得到的火灾动态温度场数据传输到有限元软件ABAQUS中,使用ABAQUS对整体结构进行热力耦合计算,得到整体结构在特定火灾场景下的力学响应特性。案例分析表明,该文创建的耦合方法可将FDS模拟得到的温度场数据传输到ABAQUS模型,分析结果显示传输温度场数据最大误差为2.18%;模拟整体结构热响应行为时考虑不均匀热膨胀引起的内力,模拟结果更接近真实火灾场景下的力学响应。To perform thermal-mechanical coupling analysis of steel structures, International Standard ISO834 is commonly employed to describe the temperature-time curve induced by a fire. However, previous studies demonstrated that the ISO834 cannot accurately describe the temperature profile in a real fire. Taking the overall structure as a research object, this paper developed a fire-thermal-structural coupled analysis method based on FDS and ABAQUS, which can be used to simulate the steel structures＇ thermal response according to the real temperature curve resulting from a fire. The dynamic temperature fields are transmitted from FDS to ABAQUS models through an FDS-ABAQUS coupling interface, which was developed in this study. Meanwhile the mechanical performance of the overall structure under fire is numerically analyzed using ABAQUS. The results of case study demonstrated that the proposed method can effectively transmit temperature fields from FDS to ABAQUS with an error of less than 2.18%. The results of simulation are more accurate when internal forces due to uneven thermal expansion are taken into account.

关 键 词：钢结构 火灾 结构热响应 热力耦合方法 FDS ABAQUS 

分 类 号：TU391[建筑科学—结构工程]