高温下S690高强度结构钢H型轴压柱稳定承载力研究  

Study on stable bearing capacity of H⁃section axial compression column made of S690 high structural steel under high temperature

作　　者：门进杰[1,2] 初晓伟 兰涛[1,3] 冯哲媛 李通 张亮[1] Men Jinjie;Chu Xiaowei;Lan Tao;Feng Zheyuan;Li Tong;Zhang Liang(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;State Key Laboratory of Green Building in Western China,Xi’an University of Architecture&Technology,Xi’an 710055,China;CSIC International Engineering Co.Ltd,Beijing 100021,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西部绿色建筑国家重点实验室/西安建筑科技大学,陕西西安710055 [3]中国船舶重工集团国际工程有限公司,北京100021

出　　处：《建筑科学》2023年第5期66-75,共10页Building Science

基　　金：国家重点研发计划政府间国际科技创新合作重点专项(2019YFE0112900);国家自然科学基金项目(51878542);西部绿色建筑国家重点实验室自主研究课题(LSZZ202115)。

摘　　要：现有的抗火规范均是基于普通钢的研究制订的,未考虑高强钢的材性退化。为了研究高温下S690高强度钢H型轴压柱的稳定承载力,本文在已有试验研究的基础上利用有限元软件ANSYS模拟其高温下的整体稳定性能,分析残余应力、初始几何缺陷和长细比等对构件稳定承载力的影响。结果表明,当长细比为40时,残余应力对稳定系数的影响最大,当长细比为40~60时,稳定系数受初始几何缺陷的影响最大。将有限元计算结果与各国规范进行对比,修正了高温下稳定系数的计算公式,提出了高温下S690轴压构件的稳定系数设计建议,并给出其稳定承载力的验算公式。The existing fire resistance specifications are based on the research of ordinary steel,and do not consider the material property degradation of high⁃strength steel.In order to study the stability capacity of the axial compression H⁃section high⁃strength S690steel column under high temperature,based on published experimental data,the finite element software ANSYS is used to simulate the overall stability of it under high temperature,and the effects of residual stress,initial geometrical imperfection and slenderness ratio on the stability capacity of components is analyzed.The results show that when slenderness ratio is 40,the residual stress has the greatest effect on the stability coefficient,and when slenderness ratio is 40 to 60,the stability coefficient is most affected by initial geometrical imperfection.The results data are compared with the design rules provided by EN 1993-1-2,ASIC-2000,and CECS200:2006,and the calculation formula of stability coefficient at high temperature is modified.The design proposal of stability coefficient is proposed for the S690 axial compression member at high temperature,and the check formula of its stability capacity is given.

关 键 词：高温 高强钢S690 轴压柱 有限元分析 稳定系数 

分 类 号：TU312[建筑科学—结构工程]