论文部分内容阅读
研究由420 MPa级高强钢(HSS)制成的焊接圆钢管柱的屈曲性能。对24个直径为273 mm、厚度为6 mm的轴心受压柱试件进行试验,测量包括轴向弯曲和荷载偏心距在内的初始几何缺陷。介绍并详细讨论关于屈曲模式和承载力的试验结果,并建立非线性有限元模型,对不同截面大小、由HSS 60制成的焊接圆钢管进行进一步参数分析。将有限元和试验结果与中国、欧洲以及美国规范中已有的柱设计曲线相比较。数值结果显示,可以采用GB 50017—2003、欧洲规范EC 3和ANSI/AISC360-10中的设计公式所计算的数值。此外,为了进一步提升设计效率,提出一条可用于这种高强钢焊接圆钢管设计、基于缺陷系数为0.17的欧洲规范EC 3公式的柱设计曲线。
Studied the buckling behavior of welded steel tubular columns made of 420 MPa high strength steel (HSS). Twenty-four axial compression specimens with a diameter of 273 mm and a thickness of 6 mm were tested to measure the initial geometric imperfections including axial bending and load eccentricity. The test results on buckling mode and bearing capacity are introduced and discussed in detail. A nonlinear finite element model is established to further analyze the parameters of welded round steel pipes made by HSS 60 with different cross-sectional sizes. The finite element and experimental results are compared with the existing column design curves in China, Europe and the United States. The numerical results show that the values calculated using the design formulas in GB 50017-2003, European Specification EC 3 and ANSI / AISC 360-10 can be used. In addition, in order to further improve the design efficiency, a column design curve that can be used for this high-strength welded steel pipe design based on the European standard EC 3 formula with a defect coefficient of 0.17 is proposed.