摘要
为了验证壁厚小于1 mm的G550级高强钢材对中国<冷弯薄壁型钢结构技术规范>(GB50018-2002)相关设计规定的适应性,进行了30根冷弯薄壁型钢方管截面轴压短柱的试验研究,试件的壁厚均为0.6 mm、宽厚比为20～150.试验结果表明:当宽厚比较小时(b/t≤40),试件的初始缺陷和高强钢材本身特性对构件承载力的影响较大,试件材料的强度得不到充分发挥;当宽厚比较大时(b/t＞40),高强钢材局部屈曲和有效截面是影响构件承载力的主要因素.通过对试验结果和各国规范计算结果的对比分析,给出了高强冷弯薄壁型钢构件按中国规范GB 50018-2002计算有效宽度的建议.
In order to verify the adaptability of Chinese Technical Code of Cold-formed Thinwall Steel Structures GB 50018-2002 for the grade G550 high-strength steel of wall thickness less than 1 mm, the 30 specimens of cold formed steel stub columns had been tested under axial compression loading. The wall thickness of specimens are all 0.6 mm and the ratios of width to thickness are from 20 to 150. The experimental results show that initial imperfections and material properties are major influence factors for bearing capacity of specimens with low ratios of width to thickness （b/t≤40）, and local buckling and effective section are major influence factors for bearing capacity of specimens with high ratios of width to thickness（b/t〉40）. Through comparing the test results with the design specifications of Chinese code GB 50018-2002 and other countries＇, the suggestions of calculating effective width for the grade G550 high-strength steel by Chinese code GB 50018-2002 are presented.
出处
《建筑科学与工程学报》
CAS
2005年第3期36-44,共9页
Journal of Architecture and Civil Engineering
关键词
高强冷弯薄壁型钢
短柱
试验研究
有效宽度
high-strength cold-formed steel
stub column
experimental research
effective width
