焊接不锈钢轴心受压构件局部稳定和相关稳定性能研究
发布时间：2018-08-19 21:00
【摘要】：不锈钢结构具有优良的耐腐蚀性和耐久性，可以从根本上解决普通钢结构的锈蚀和维护问题，在建筑结构中具有可观的应用前景。不锈钢材的非线性材料力学性能与普通钢材存在明显区别，焊接不锈钢构件截面的残余应力分布不同于普通钢结构构件，将显著影响焊接不锈钢构件的稳定承载力。现有的研究主要集中于薄壁的冷成型不锈钢结构构件，缺少针对具备较高承载能力的焊接截面构件的试验研究与设计方法，而我国尚无不锈钢结构设计规范，十分不利于不锈钢结构的实际工程应用。本文的研究工作依托我国首本《不锈钢结构技术规范》的编制开展，通过大量的试验研究和数值计算，结合结构稳定理论分析，，对焊接不锈钢轴心受压构件的残余应力、局部稳定和相关稳定性能进行了系统深入的研究，提出了建议设计计算方法。本文的研究工作主要包括以下四个方面： （1）采用分割法对焊接加工成型的18个不锈钢试件截面的残余应力大小与分布形态进行了实际试验量测，包括奥氏体型S30408和双相型S22253两种不锈钢牌号，工字形、等边和不等边箱形三种截面形式，基于试验数据提出了截面残余应力建议简化分布模型，并将建议分布模型的应用范围推广到奥氏体型、双相型和铁素体型三大类不锈钢。 （2）开展了72组拉伸与压缩材性试验和28个两端固接的焊接不锈钢短柱局部稳定加载试验，得到了不锈钢板材的拉、压力学性能以及构件的局部稳定性能，试验结果验证了有限元数值模拟的可靠性。 （3）进行了18个两端铰接焊接不锈钢柱的相关稳定加载试验，建立了能够模拟不锈钢材料力学性能、焊接残余应力、局部与整体几何初始缺陷以及初始加载偏心距等因素的精细有限元模型，试验结果验证了有限元模型的准确可靠性。 （4）对影响焊接不锈钢轴压构件局部稳定和相关稳定的主要因素开展了多目标参数分析，并完成了844个局部稳定算例和654个相关稳定算例的计算分析。通过对现有设计方法的评估，建议了加劲和非加劲板件的受压临界宽厚比限值，提出了计算局部屈曲后强度的有效宽度法和直接强度法建议公式，同时提出了两种相关稳定承载力建议计算方法：有效截面-Perry公式法和直接强度-Perry公式法。
[Abstract]:Stainless steel structure has excellent corrosion resistance and durability, which can fundamentally solve the problems of corrosion and maintenance of common steel structure. The mechanical properties of nonlinear materials of stainless steel are obviously different from those of common steel, and the residual stress distribution of welded stainless steel members is different from that of ordinary steel structural members, which will significantly affect the stability bearing capacity of welded stainless steel members. The existing researches mainly focus on the cold-formed stainless steel structural members with thin wall, and lack of experimental research and design methods for welded cross-section members with high load-carrying capacity, but there is no stainless steel structural design code in China. It is very unfavorable to the practical engineering application of stainless steel structure. The research work in this paper relies on the compilation of the first Technical Specification for stainless Steel structure in China. Through a large number of experimental studies and numerical calculations, combined with the theoretical analysis of structural stability, the residual stresses of welded stainless steel axial compression members are analyzed. The local stability and the related stability performance are studied systematically, and the design calculation method is proposed. The research work of this paper mainly includes the following four aspects: (1) the residual stress size and distribution of 18 stainless steel specimens fabricated by welding are measured by using the split method. It includes austenitic S30408 and duplex S22253 stainless steel grades, I-shaped, equilateral and non-equilateral box shapes. Based on the experimental data, a simplified model for the distribution of residual stress in sections is proposed. The application range of the proposed distribution model is extended to austenitic type. Duplex and ferrite stainless steels. (2) 72 groups of tensile and compression tests and 28 local stable loading tests of welded stainless steel columns with two ends are carried out, and the tensile properties of stainless steel plates are obtained. The reliability of the finite element numerical simulation is verified by the experimental results. (3) the related stable loading tests of 18 welded stainless steel columns with hinged ends are carried out. A fine finite element model is established to simulate the mechanical properties of stainless steel, welding residual stress, local and global geometric initial defects, and initial loading eccentricity. The experimental results verify the accuracy and reliability of the finite element model. (4) the main factors affecting the local stability and the related stability of welded stainless steel axial compression members are analyzed by multi-objective parameter analysis. The calculation and analysis of 844 local stability examples and 654 related stability examples are completed. Based on the evaluation of the existing design methods, the critical width-thickness ratio limits for stiffened and non-stiffened plates are suggested, and the effective width method and direct strength method for calculating local buckling strength are proposed. At the same time, two methods for calculating the bearing capacity of stability are proposed: the effective section Perry formula method and the direct strength Perry formula method.
【学位授予单位】：清华大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU391
本文编号：2192817
[Abstract]:Stainless steel structure has excellent corrosion resistance and durability, which can fundamentally solve the problems of corrosion and maintenance of common steel structure. The mechanical properties of nonlinear materials of stainless steel are obviously different from those of common steel, and the residual stress distribution of welded stainless steel members is different from that of ordinary steel structural members, which will significantly affect the stability bearing capacity of welded stainless steel members. The existing researches mainly focus on the cold-formed stainless steel structural members with thin wall, and lack of experimental research and design methods for welded cross-section members with high load-carrying capacity, but there is no stainless steel structural design code in China. It is very unfavorable to the practical engineering application of stainless steel structure. The research work in this paper relies on the compilation of the first Technical Specification for stainless Steel structure in China. Through a large number of experimental studies and numerical calculations, combined with the theoretical analysis of structural stability, the residual stresses of welded stainless steel axial compression members are analyzed. The local stability and the related stability performance are studied systematically, and the design calculation method is proposed. The research work of this paper mainly includes the following four aspects: (1) the residual stress size and distribution of 18 stainless steel specimens fabricated by welding are measured by using the split method. It includes austenitic S30408 and duplex S22253 stainless steel grades, I-shaped, equilateral and non-equilateral box shapes. Based on the experimental data, a simplified model for the distribution of residual stress in sections is proposed. The application range of the proposed distribution model is extended to austenitic type. Duplex and ferrite stainless steels. (2) 72 groups of tensile and compression tests and 28 local stable loading tests of welded stainless steel columns with two ends are carried out, and the tensile properties of stainless steel plates are obtained. The reliability of the finite element numerical simulation is verified by the experimental results. (3) the related stable loading tests of 18 welded stainless steel columns with hinged ends are carried out. A fine finite element model is established to simulate the mechanical properties of stainless steel, welding residual stress, local and global geometric initial defects, and initial loading eccentricity. The experimental results verify the accuracy and reliability of the finite element model. (4) the main factors affecting the local stability and the related stability of welded stainless steel axial compression members are analyzed by multi-objective parameter analysis. The calculation and analysis of 844 local stability examples and 654 related stability examples are completed. Based on the evaluation of the existing design methods, the critical width-thickness ratio limits for stiffened and non-stiffened plates are suggested, and the effective width method and direct strength method for calculating local buckling strength are proposed. At the same time, two methods for calculating the bearing capacity of stability are proposed: the effective section Perry formula method and the direct strength Perry formula method.
【学位授予单位】：清华大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU391
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