摘要
针对铁路工程应用的HRB400、HRBF400、HRB500、HRBF500共4种规格的闪光对焊连接高强钢筋开展疲劳试验研究,其中每种规格的钢筋按直径可分为16mm、20mm、25mm和32mm四种类型。疲劳试验以高频疲劳试验为主,低频疲劳试验为辅,疲劳试验的应力比为0.2和0.4,试验共计完成285根试件,其中有效试件数253根,试件破坏数212根,试件未破坏数41根。得到各种规格高强钢筋的S-N曲线,共计19根,其中高频试验曲线16根,低频试验曲线3根,进而得出闪光对焊连接高强钢筋的200万次、500万次和1000万次疲劳寿命对应的疲劳应力幅,在统计分析的基础上,提出了考虑钢筋直径效应、疲劳应力比和钢材牌号影响的闪光对焊连接高强钢筋疲劳应力幅设计建议值计算式,为铁路设计规范的完善提供依据。
The fatigue tests of 4 kinds of high strength steel bars （ i. e., HRB400, HRBF400, HRBS00 and HRBFS00） connected by flash butt welding were carried. For each specification of steel bars, the diameter is divided into 16ram, 20ram, 25mm and 32mm. The fatigue tests include the main high-frequency fatigue test and the supplementary low frequency fatigue tests were supplemented. The stress ratio of the fatigue tests were 0. 2 and 0.4. A total of 285 specimens were tested, among which 253 specimens were effective including 212 destroyed specimens and 41 undestroyed specimens. 19 S-N curves of various specifications of high strength steel bar were obtained including 16 high frequency test S-N curves and 3 low frequency test S-N curves. The fatigue stress amplitude of 2 million times, 5 million times and 10 million times of high strength steel bars connected by flash butt welding are obtained, respectively. On the basis of the statistical analysis, the design formula for fatigue stress amplitude of high strength steel bars connected by flash butt welding is proposed, in which the effect of steel bar diameter, fatigue stress ratio and the type of high strength steel bars are considered. The research results can provide reference for the improvement of railway design codes.
出处
《土木工程学报》
EI
CSCD
北大核心
2017年第12期56-61,共6页
China Civil Engineering Journal
基金
中国铁路总公司科研试验项目--铁路工程应用高强钢筋试验(Z2014-038)
中南大学中央高校基本科研业务费专项资金资助(2017zzts155)
关键词
高强钢筋
疲劳试验
闪光对焊
S-N曲线
疲劳应力幅
high strength steel
fatigue test
flash butt welding
S-N curve
fatigue stress amplitude
