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采用ANSYS软件建立焊接H形截面纯弯钢构件有限元分析模型,模拟截面残余应力、板件初始缺陷和几何非线性,分析强翼缘弱腹板和弱翼缘强腹板两组构件的弹塑性局部相关屈曲性能,分别讨论腹板高厚比、翼缘宽厚比和相对宽厚比(腹板高厚比与翼缘宽厚比之比)对构件局部稳定系数的影响。研究结果表明,局部稳定系数随腹板高厚比或翼缘宽厚比增大而显著降低,与相对宽厚比基本成线性关系;两组局部稳定系数拟合公式相对误差为-1.19%~1.15%,精度较高;可以根据整体稳定性和局部相关稳定性近似相等的原则,确定腹板高厚比和翼缘宽厚比限值相关曲线;平面外整体长细比较小时,钢结构设计规范的腹板高厚比和翼缘宽厚比限值部分超越宽厚比限值相关曲线。
ANSYS software was used to establish finite element model of welded H-section pure curved steel member. The residual stress of the cross section, the initial defect of the plate and the geometric nonlinearity were simulated. The bombs of the weak web and the weak web were analyzed. Plastic local buckling performance, the effects of the ratio of web height-thickness ratio, flange width-thickness ratio and relative width-thickness ratio (the ratio of web height-thickness ratio to flange width-thickness ratio) on the local stability of members are discussed. The results show that the local stability coefficient decreases significantly with the ratio of web thickness to thickness or the ratio of flange width to thickness, and has a linear relationship with the relative width to thickness ratio. The relative error between the two groups is -1.19% -1.15% And the accuracy is high. According to the principle that the overall stability and the local relative stability are approximately the same, the curves of the ratio of web height to thickness and flange width to thickness ratio are determined. When the overall slenderness ratio is small, the steel structure design code The ratio of plate thickness to thickness and flange width to thickness ratio partially exceeds the curve of the ratio of width to thickness.