不锈钢压弯构件整体稳定性能有限元研究与承载力计算方法

FE RESEARCH ON THE OVERALL STABILITY OF STAINLESS-STEEL BEAM-COLUMNS AND CALCULATION METHOD OF BEARING CAPACITY

该文采用有限元软件ANSYS建立了焊接不锈钢压弯构件有限元模型,并基于试验结果验证了该模型的有效性。采用经验证的有限元模型分析了残余应力和几何初始缺陷对构件整体稳定性能的影响,并在广泛的截面等级、荷载偏心和长细比组合下进行了参数分析以产生足够的数据点。最后,利用有限元分析结果对我国现行《不锈钢结构技术规程》(CECS 410―2015)中的计算方法进行评价,并给出了提高计算精度的改进方法。结果表明:CECS 410―2015中的计算方法对于不锈钢焊接工字形和箱形截面压弯构件整体稳定承载力的预测均偏于保守,改进的计算方法能够更精确地预测不锈钢焊接工字形和箱形截面压弯构件的整体稳定承载力。

The finite element(FE)software ANSYS was used to establish a FE model for a stainless steel welded-section beam-column.Based on the experimental results,the validity of the FE model was verified.The verified FE model was used to investigate the influence of residual stress and initial geometric imperfection on the overall stability of components and employed for parametric investigations to generate sufficient data points over a wider range of cross-section classes,including slenderness ratios and load eccentricities combinations.Based on the obtained FE results,the calculation method provided in CECS 410―2015 was assessed again,and an improved calculation method was proposed.The results indicate that the calculation method in CECS 410―2015 provides conservative predictions for the overall stability bearing capacity,and that the improved calculation method is more accurate in predicting the overall stability bearing capacity of stainless steel welded I-section and box-section beam-columns.