摘要
通过有限元模拟探讨将耐火钢短梁应用于钢框架梁-柱连接以提高连接抗火性能的可能性.考察三维有限元建模过程中模型简化、网格划分、求解方法和接触关系等关键技术,以提高计算效率并确保分析结果的可靠性.提出3个确定极限温度的准则并应用于钢框架,通过比较可知:对于采用普通钢的钢框架,采用准则1与准则2确定的极限温度与由最大挠度为L/20和L/10所确定的临界温度较接近,这有益于指导钢框架抗火设计.比较普通钢与耐火钢短梁的变形可知:耐火钢的使用可以有效控制跨中挠度变形,使最大变形值减小1/2以上.
To improve the fire-resistance of beam-column connections in steel frame,by finite element simulation,the application of refractory steel stub beam in beam-column connections is discussed. To improve the calculation efficiency and ensure the reliability of analysis results,the key technologies in finite element modeling are studied,such as model simplification,meshing,solution method,contact relationship,and so on. Three criteria are proposed by which the limiting temperature of steel frame beam can be determined. The comparison indicates that,as to the steel frame made of common steel,the limiting temperatures determined by criterion 1 and criterion 2 are quite close to those determined by the maximum deflection as L /20 and L /10,and it is beneficial for the fire-resistance design of steel frame.The deformation of common steel stub beam is compared with that of refractory steel stub beam,and it indicates that the application of refractory steel in stub beam could effectively control the mid-span deflection deformation and the maximum deformation value can be reduced by more than 50%.
出处
《计算机辅助工程》
2015年第6期66-71,共6页
Computer Aided Engineering
基金
国家自然科学基金(11272189
51208289)
山东省自然科学基金(ZR2012EEM009)
关键词
钢框架
短梁
梁-柱连接
耐火钢
极限温度
挠度
三维有限元
steel frame
stub beam
beam-column connection
refractory steel
limiting temperature
deflection
3D finite element
