湖南大学学报（自然科学版）2018，Vol.45Issue(3)：110-114,5.DOI:10.16339/j.cnki.hdxbzkb.2018.03.013
桥上纵连板式无砟轨道HRB500钢筋概率S-N曲线研究
Research on Probabilistic S-N Curve of HRB500 Reinforcing Bar of Longitudinal Connected Slab Track on Bridge
摘要
Abstract
To study the fatigue properties of HRB500 reinforcing bar in longitudinal connected slab track on bridge,fatigue tests under symmetric axial alternating tension-compression cyclic loads for stand-ard specimens of HRB500 reinforcing bar were conducted,and then the fatigue life and its cumulative fail-ure probability of standard HRB500 reinforcing bar at different stress levels were obtained.On this basis, the correlation coefficient p and Theil's inequality coefficient u were used as indexes of estimation accuracy to evaluate three methods which are widely used to estimate parameters of three-parameter Weibull distri-bution.And the grey prediction method,whose prediction accuracy is the highest among the three meth-ods,was used to estimate the parameters of three-parameter Weibull distribution for the fatigue life of standard HRB500 reinforcing bar,and the distribution functions for the fatigue life of HRB500 reinforcing bar at different stress levels were obtained.Ultimately,the probabilistic S-N curve of HRB500 reinforcing bar in the longitudinal connected slab track on bridge with reliable index of 4.2 based on Kohout-Vêchet e-quation in the full stress range was established.The research can provide experimental basis for the estab-lishment of fatigue life prediction model of HRB500 reinforcing bar in the longitudinal connected slab track on bridge under combined loads during service life.关键词
HRB500钢筋/疲劳试验/三参数威布尔分布/概率S-N曲线Key words
HRB500 reinforcing bar/fatigue test/three-parameter Weibull distribution/probabilistic S-N curve分类
交通工程引用本文复制引用
徐庆元,段俊,肖祖材,娄平,魏琪,张泽,方子匀..桥上纵连板式无砟轨道HRB500钢筋概率S-N曲线研究[J].湖南大学学报（自然科学版）,2018,45(3):110-114,5.基金项目
国家自然科学基金资助项目(51178469),National Natural Science Foundation of China(51178469) （51178469）
中南大学中央高校基本科研业务费专项资金资助项目(2017ZZTS593),Fundamental Research Funds for the Central Universities of Central South Univer-sity(2017ZZTS593) （2017ZZTS593）
国家自然科学基金-高速铁路基础研究联合基金资助项目(U1334203,U1134209),National Natural Science Joint High Speed Railway Foundation of China(U1334203,U1134209) （U1334203,U1134209）
