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对冷弯经济型双相不锈钢受弯构件进行试验研究及数值分析。试件由屈服强度(σ0.2)为450MPa的经济型双相不锈钢板材冷轧成型。对方形和矩形截面空心型材试件进行绕强轴和弱轴的弯曲试验。利用取样试验得到的材料性能建立有限元模型,并利用弯曲试验结果对其进行验证。结果表明,该模型可以准确预测经济型双相不锈钢抗弯构件的性能。利用有限元模型进行了大量参数研究。利用现有的各种设计准则,如美国规范、澳大利亚/新西兰规范、欧洲规范以及直接强度法计算冷弯不锈钢的设计强度,并与经济型双相不锈钢梁的试验和数值分析结果以及可用的数据进行对比。为评估这些设计准则的可靠性,进行了可靠性分析。结果表明,现有设计准则计算经济型双相不锈钢受弯构件的设计强度时偏于保守。对美国规范、澳大利亚/新西兰规范、欧洲规范以及直接强度法进行了修正,提高了这些设计准则的精度。
Experimental study and numerical analysis of cold-formed economical duplex stainless steel flexural members. Specimens from the yield strength (σ0.2) 450MPa economical duplex stainless steel sheet cold-formed. The square and rectangular cross-section hollow profile specimens were tested for bending around the strong axis and the weak axis. The finite element model was established by using the material properties obtained from the sampling test, and the bending test results were used to verify the results. The results show that this model can accurately predict the performance of economical duplex stainless steel flexural members. A large number of parametric studies have been conducted using the finite element model. Design strength of cold-formed stainless steel is calculated using existing design guidelines such as the US Code, Australian / New Zealand Specifications, European Directives, and Direct Strength Methods, along with experimental and numerical analysis of economical duplex stainless steel beams and available data comparing. To assess the reliability of these design criteria, a reliability analysis was conducted. The results show that the existing design criteria are conservative when calculating the design strength of economical duplex stainless steel flexural members. Amendments to the US Code, Australia / New Zealand Code, European Code, and Direct Intensity Act improve the accuracy of these design guidelines.