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基于国内外已有的不锈钢焊接工字形截面梁整体稳定性的计算方法,包括美国SEI/ASCE 8-02中的方法、欧洲EN 1993-1-4中的方法和王元清提出的方法,采用有限元方法对不锈钢焊接工字形截面梁的整体稳定性进行分析,并用不锈钢焊接工字形截面梁已有的试验数据对有限元模型的准确性进行验证,在此基础上,对不锈钢焊接工字形截面梁进行参数化分析。分析表明:对梁整体稳定承载力影响的因素从大到小依次为材料名义屈服强度、荷载类型、截面类型和焊接残余应力;在参数化分析的基础上,提出基于修正正则化长细比的Perry公式型整体稳定系数表达式;将所提出的计算方法、国内外现有的计算方法与试验数据进行了对比,结果表明受试验中边界条件的影响,试验值高于计算方法的计算值,与其他方法相比,所提出的计算方法与有限元计算结果吻合更好,可以用于计算焊接工字形截面梁的整体稳定承载力。
Based on the existing methods of calculating the overall stability of welded stainless steel I-beam, including the methods in SEI / ASCE 8-02 in the United States, the methods in European EN 1993-1-4 and the method proposed by Wang Yuanqing, the finite element method Methods The overall stability of stainless steel welded I-beam was analyzed and the accuracy of the finite element model was verified with the existing experimental data of stainless steel welded I-beam. Based on this, Parametric analysis. The analysis shows that the factors influencing the overall bearing capacity of the beam in descending order are the nominal yield strength, the type of load, the type of cross section and the residual stress of welding. Based on the parametric analysis, the modified regularized slenderness ratio Perry formula is used to calculate the overall stability coefficient. The proposed calculation method is compared with the existing experimental data at home and abroad. The results show that the experimental value is higher than the calculated value of the calculation method under the influence of the boundary conditions. Compared with other methods, the proposed method is in good agreement with the finite element method and can be used to calculate the overall stability of welded I-beam.