复合型高性能钢材轴压构件整体稳定性能研究  

Research on overall buckling behavior of superior high-performance steel columns

作　　者：班慧勇[1,2] 赵平宇 周国浩 石永久[1,2] 刘锟[3] Ban Huiyong;Zhao Pingyu;Zhou Guohao;Shi Yongjiu;Liu Kun(School of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education,Tsinghua University,Bejjing 100084,China;Shougang Group Research Institute of Technology,Beijing 100041,China)

机构地区：[1]清华大学土木水利学院,北京100084 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [3]首钢集团技术研究院,北京100041

出　　处：《土木工程学报》2021年第9期39-55,共17页China Civil Engineering Journal

基　　金：国家重点研发计划资助(2017YFB0304700)。

摘　　要：为提升现代钢结构工程的综合抗灾能力,集高强度、高延性、耐蚀性和耐火性为一体的新一代复合型高性能钢材已经出现。该文针对该类钢材焊接工字形截面轴压构件的整体稳定性能,设计并完成6个长柱稳定试验,研究构件的稳定承载力和失稳破坏形式,并将试验结果与我国《钢结构设计标准》(GB 50017—2017)的柱子曲线进行对比,给出建议的曲线选型;同时,建立有限元模型并验证其准确性和可靠性;进一步通过大量算例分析初始缺陷、残余应力、材料强度和本构模型等对轴压构件整体稳定性能的影响;最后,基于参数分析算例结果,拟合复合型高性能钢材轴压构件新的柱子曲线公式,提出整体稳定设计方法。研究成果对促进该类钢材的工程应用具有重要意义。In order to improve the resistance of modern steel structures against various disasters,a new generation of superior high-performance( SHP) steel,combining with high strength,high ductility,corrosion resistance and fire resistance,has been developed. To investigate the overall buckling behavior of such superior high-performance steel welded I-section axial compression members,experiments were carried out on six specimens and the bearing capacity and failure modes of the specimens were identified. By comparing with the column curves in the national standard GB 50017—2017,the column curve type for designing such members was recommended. Furthermore,finite element( FE) models were established according to the conditions in the experiments and the accuracy and reliability of the models were validated. Then parametric study was carried out to analyse the effects of initial imperfections,residual stresses,material strengths and constitutive models on the overall buckling behavior. Finally,based on the analysis results FE simulation,updated column curves for the superior high-performance steel welded I-section axial compression members were proposed.The research outcomes can provide reference for practical application of this superior high-performance steel.

关 键 词：复合型高性能钢 轴压构件 焊接工字形截面 整体稳定 试验研究 设计方法 

分 类 号：TU391[建筑科学—结构工程]