G550高强冷弯薄壁Z形钢受弯构件承载力试验与直接强度法研究

发布时间：2018-06-15 17:13

  本文选题：高强冷弯薄壁Z形钢 + 卷边形式　； 参考：《建筑结构学报》2017年07期

【摘要】：为了研究高强冷弯薄壁型钢构件的受弯性能和完善直接强度法,对卷边形式为斜卷边、直卷边和复杂卷边的12个G550高强冷弯薄壁Z形钢受弯试件进行了静力试验。试验结果表明,卷边形式对试件屈曲模式和受弯承载力有显著影响,试件发生了局部与畸变相关屈曲或畸变屈曲,直卷边试件的承载力高于斜卷边试件的承载力,复杂Ⅱ型卷边试件的承载力高于复杂Ⅰ型卷边试件的承载力。根据试验结果并结合现有国外直接强度法公式,回归出G550高强冷弯薄壁Z形钢受弯构件发生局部与畸变相关屈曲变形时的承载力直接强度法修正公式,当此类构件发生畸变屈曲时,无需再修正现有直接强度法公式。建立有限元模型对试验进行了分析,分析结果与试验结果吻合良好。在此基础上,利用大量有限元分析结果验证了直接强度法修正公式比现有直接强度法公式对此类构件的承载力的预测更为安全可靠。
[Abstract]:In order to study the bending behavior of high-strength cold-formed thin-walled steel members and perfect the direct strength method, static tests were carried out on 12 G550 high-strength cold-formed thin-walled Z-shaped steel specimens with oblique, straight and complicated edges. The experimental results show that the crimping form has a significant effect on the buckling mode and flexural bearing capacity of the specimen. The buckling or buckling of the specimen is associated with local buckling or distortion, and the bearing capacity of the straight crimped specimen is higher than that of the oblique crimped specimen. The bearing capacity of complex type II crimping specimen is higher than that of complex type 鈪，

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