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焊接残余应力导致不锈钢梁截面纤维过早达到屈服,并严重降低不锈钢梁的抗弯刚度。为了研究残余应力对焊接工字形不锈钢梁侧扭屈曲的影响,根据目前被广泛采纳的不锈钢工字形截面残余应力分布模型,采用有限元方法,对残余应力分布模型的主要因素进行参数化分析,研究这些因素对不锈钢梁侧扭屈曲的影响,使对焊接工字形不锈钢梁的整体稳定性能的研究更加完善。结果表明:翼缘残余压应力峰值对不锈钢梁侧扭屈曲的影响最为显著。
Welding residual stress leads to premature yielding of stainless steel beam cross-section fibers and severely reduces the bending stiffness of stainless steel beams. In order to study the influence of residual stress on the torsional buckling of welded I-shaped stainless steel beams, the finite element method is used to analyze the main factors of the residual stress distribution model according to the widely adopted stainless steel I-section residual stress distribution model. The influence of these factors on the lateral buckling of the stainless steel beam improves the overall stability of the welded I-shaped stainless steel beam. The results show that the influence of residual compressive stress on the buckling of stainless steel beam is the most significant.