摘要
进行了149个冷弯薄壁型钢螺钉连接试件的抗剪性能试验,主要考察螺钉端距、间距、排列方式以及螺钉数目、连接板件材料等因素对抗剪承载力的影响.分析了现行国家标准《冷弯薄壁型钢结构技术规范》(GB 50018—2002)对壁厚1.5mm以下薄钢板螺钉连接抗剪承载力设计计算方法的适用性.针对规范GB 50018—2002对螺钉连接斜拔承压破坏抗剪承载力计算的规定,提出了考虑群效应的螺钉连接抗剪承载力设计计算方法.基于对钢板净截面拉断破坏时净截面的平均应力水平分析,给出了相应的验算公式.最后,参考澳洲规范AS/NZS 4600∶2005,提出了避免发生螺钉剪断破坏的方法.
A series of tests （149 specimens） on single lap shear connections with self-drilling/self-tapping screws were carried out to investigate the effect of the end distance, screw spacing, pattern of screws arrangement and the number of screws, materials of sheets on shear connection strength. An analysis was made of the adaptability of the current design method provided by the Chinese ＂Technical code of cold- formed thin-wall steel structures＂ （GB 50018--2002） for load-carrying capacity of self-drilling/self-tapping screw shear connections for steel sheets below 1. 5 mm thick. Shear strength estimation methods for self-drilling/self-tapping screw connections based on different failure modes were studied. Based on a comparative study of test results, the proposed design method with a consideration of the influence of group effect was presented. Based on the analysis of mean stress of steel sheet net section, an estimation equation was presented to calculate the shear connection strength when tensile fracture of steel sheet occurred. Finally, a method to avoid shear fracture of screws was proposed according to Australian/New Zealand Standard ＂ Cold-formed steel structures＂ （AS/NZS 4600 ： 2005）.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第1期11-19,共9页
Journal of Tongji University:Natural Science
基金
"十二五"国家科技支撑计划(2012BAJ16B05)
关键词
冷弯薄壁型钢
螺钉连接
抗剪承载力
破坏模式
群效应
cold-formed thin-walled steel
screw connections
shear strength
failure modes
group effect
