高温下多跨门式刚架受火极限温度表达式  

Expression of Fire Limit Temperature of Multi Span Portal Frame Under High Temperature

作　　者：李雨城 王伟 吴明明[1] LI Yu-cheng;WANG Wei;WU Ming-ming(School of Mechanical Engineering,AnhuiSanlian University,Hefei 230601,China)

机构地区：[1]安徽三联学院机械工程学院,安徽合肥230601

出　　处：《兰州工业学院学报》2020年第5期27-30,共4页Journal of Lanzhou Institute of Technology

基　　金：安徽高校省级自然科学研究重大项目(KJ2014ZD06);安徽省自然科学基金(1408085QE96);安徽省教育厅青年人才支持计划项目(gxyq2018125)。

摘　　要：应用Ansys数值模拟软件对高温下多跨门式框架受火极限温度进行研究并建立了有限元模型.采用参数化建模,首先得出环境温度场的分布,再综合应力比与钢材钢架梁倾角的变化进行结构分析.考虑不同位置温度分布、钢材钢架梁倾角与应力比的变化进行耦合对单层2跨门式刚架结构受火极限温度的影响,使用应力比与钢材钢架梁倾角作为自变量,相对应的受火极限温度作为因变量,基于Matlab程序多元函数拟合,导出了门式刚架高温下受火极限温度的使用表达式,可供一般工程应用参考.In this paper,ANSYS numerical simulation software is used to study the fire limit temperature of multi span portal frame under high temperature,and a finite element model is established.Using parametric modeling,the distribution of environmental temperature field is obtained firstly,and then the structural analysis is carried out by combining the stress ratio and the change of a specific parameter.Considering the influence of temperature distribution in different positions,inclination angle of steel frame beam and the change of stress ratio on the fire limit temperature of single-layer and two span portal frame structure,the stress ratio and a specific working condition parameter value are used as independent variables,and the corresponding fire limit temperature is used as dependent variable.Based on the multiple function fittings of MATLAB program,the fire limit of portal frame at high temperature is derived.The expression of critical temperature of fire resistance under high temperature can be used as reference for general engineering application.

关 键 词：门式刚架 高温受火 极限承载力 受火极限温度 

分 类 号：TU352[建筑科学—结构工程]