高强钢受压构件稳定性的理论与试验研究

发布时间：2018-05-15 12:36

本文选题：Q550高强钢 + 焊接H型　；参考：《中冶集团建筑研究总院》2013年硕士论文

【摘要】：高强钢可有效减少构件断面尺寸、减少钢材用量,并可提高建筑的使用面积和使用空间,在国外发达国家得到了较广泛应用。我国已具备高强钢的生产能力,并在部分建筑工程中应用。但我国现行《钢结构设计规范》对屈服强度超过420MPa的高强钢设计方法没有规定,正在修订的《钢结构设计规范》的最高屈服强度只到460MPa,若在工程中应用强度级别超过现行规范规定的高强钢,则要针对具体工程进行专门研究。高强钢在建筑结构中应用的设计规范不配套,严重影响了高强钢在我国建筑结构中的应用。近年来我国对高强钢轴心受压构件的整体稳定性开展了一些研究工作,但研究还不够系统。本论文以Q550高强钢、焊接H型轴心受压构件为研究对象,通过理论分析和试验对比,探索其整体稳定性计算方法。本文在总结分析现有焊接H型钢残余应力分布模式的研究成果基础上,通过有限元软件模拟,选取了1组适合高强钢焊接H型截面残余应力分布模式；应用有限元软件,在考虑残余应力、几何缺陷等影响因素基础上,对高强钢焊接H型构件的稳定性能进行分析,分析了不同残余应力分布模式对构件稳定性的影响,并计算出不同长细比对应的稳定系数；选择6组高强焊接H型轴心受压构件进行稳定试验,以检验理论分析的合理性；通过理论分析和试验对比,并与欧洲钢结构设计规范、美国钢结构设计规范对比,以及我国钢结构设计规范普通钢构件稳定计算方法类比,提出了Q550高强焊接H型轴心受压构件的稳定计算方法的建议。分析结果表明,高强钢构件按现有《钢结构设计规范》计算的稳定系数略微保守。
[Abstract]:High strength steel can effectively reduce the section size of members, reduce the amount of steel, and can improve the building area and use space, and has been widely used in developed countries. Our country already has the production capacity of high-strength steel, and it is used in some construction projects. However, the present Code for Design of Steel structures in China does not provide for the design method of high strength steel whose yield strength exceeds 420MPa. The maximum yield strength of the revised Code for Design of Steel structures is only 460MPa. If the application of high strength steel in engineering is higher than the high strength steel specified in the current code, a special study should be carried out for the specific project. The design code for the application of high strength steel in building structure is not matched, which seriously affects the application of high strength steel in building structure of our country. In recent years, some researches on the overall stability of high strength steel axial compression members have been carried out in China, but the research is not systematic enough. In this paper, Q550 high strength steel, welded H-type axial compression member is taken as the research object. Through theoretical analysis and experimental comparison, the overall stability calculation method is explored. In this paper, on the basis of summarizing and analyzing the research results of the existing welding H-section steel residual stress distribution mode, through the finite element software simulation, a group of residual stress distribution modes suitable for high strength steel welding H-section are selected, and the finite element software is used. On the basis of considering the influence factors such as residual stress, geometric defect and so on, the stability performance of welded H-shaped member of high strength steel is analyzed, and the influence of different residual stress distribution modes on the stability of the member is analyzed. The stability coefficients corresponding to different aspect ratios are calculated, six groups of high-strength welded H-type axial compression members are selected for stability tests to verify the rationality of theoretical analysis, and through theoretical analysis and test comparison, and compared with the European Code for Design of Steel structures, six groups of high-strength welded H-type axial compression members are selected to test the rationality of the theoretical analysis. Compared with the American steel structure design code and the analogy of the calculation method of the stability of the ordinary steel members in the steel structure design code of our country, the paper puts forward the suggestion of the stability calculation method of the Q550 high strength welded H-shaped axial compression member. The results show that the stability coefficient of high strength steel members calculated according to the existing Code for Design of Steel structures is slightly conservative.
【学位授予单位】：中冶集团建筑研究总院
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

【参考文献】