2017年2月下 施工技术 第46卷第4期 CONSTRUCTIONTECHNOLOGY 71 DOI:10. 7672/sgjs2017040071 钢筋焊接网疲劳S-N曲线试验研究 顾万黎,朱爱萍 (中国建筑科学研究院,北京100013) [摘要]介绍了热轧带肋钢筋(HRB400)及高延性冷轧带肋钢筋(CRB600H)焊接网疲劳性能试验结果。
对疲劳试 件制作、试验条件、试件破坏特征及疲劳S-N曲线表达方式等做了说明。
以应力变化幅度(Ao)作为疲劳试验的主 要参数,取95%保证率,得到钢筋焊接网疲劳S-N曲线方程,并对曲线方程斜率(K,K)作了分析比较。
当S-N曲 线设水平截止线,循环次数N=2x10°时,对应的应力幅不低于100MPa。
当S-N曲线以循环次数N=10”作为分界 点,曲线被分为二段折线,分别得2个斜率K,和K。
将本次试验的二种焊接网与十余年前试验的冷轧带肋钢筋 (CRB550)焊接网疲劳曲线对比,3种钢筋焊接网S-N曲线方程,偏于安全地考虑,可用一种钢筋(CRB550)焊接网 S-N曲线方程代替。
试验研究结果也是焊接网规程JGJ114-2014疲劳条文编制的主要依据。
[关键词]钢筋焊接网;疲劳S-N曲线;热轧带肋钢筋(HRB400);高延性冷轧带肋钢筋(CRB600H);试验;研究 [中图分类号]TU711 [文献标识码]A[文章编号]1002-8498(2017)04-0071-04 ExperimentalResearch onFatigueS-N Curves ofWeldedFabric Gu Wanli, Zhu Aiping (China Academy of Building Research,Beijing 100013,China) Abstract:Fatigue test results of welded fabrics made of hot rolled ribbed bars (HRB400) and cold rolled ribbed bars with improved elongation (CRB600H) are introduced. Producing fatigue specimens, test conditions,failure features of specimens and expression of fatigue S-N curves etc are specified.By using a probability of95%,and analysisand pare two slopes,KandK,indiferent equations.When we set horizontal cut-offlines for S-N curves and N=2 ×10°cycles,corresponding stress ranges are not lower than 100MPa. By using V=10” cycles as a demarcation point, S-N curves are 2-segment polylines with two slopes,KandK,respctively.Afterparing fatigue curvesof twokindsofwelded fabricstested in this time with a fatigue curve of welded fabric made of CRB550 tested more than10 years ago, take safety into consideration,the fatigue curve equation of welded fabric made ofCRB550may replace the others.Experimentalresultsare alsothemainbasisforpreparationof fatigueprovisionsofspecification for welded fabric,JGJ114-2014. Key words:welded fabric; fatigue S-N curve; hot rolled ribbed bar (HRB400); cold rolled ribbed bar with improved elongation(CRB600H);testing;research 0引言 范[46]中作出规定。
随着钢筋焊接网(焊接钢筋桁架)在高速公路我国钢筋焊接网疲劳性能的研究始于21世纪 和高速铁路应用的增多,...