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| Experimental Research on the S –N Gurve of HRB500 Steel Bar in Longitudinal Connected Slab Track on Bridge |
| XU Qing - yuan，WEI Qi，LOU Ping，DUAN Jun，XIAO Zu –cai,ZHANG Ze |
| (Central South University，Changslia，Hunan 410075，China) |
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Abstract Abstract ： Research purposes ： HRB500 steel bar is the main load - bearing steel bar in longitudinal connected slab track on bridge， and its fatigue properties during service life have received great attention in engineering circles. In order to study the fatigue properties of the HRB500 steel bar in longitudinal connected slab track on bridge， static tension tests on the mechanical properties of HRB500 steel bar were conducted first. On the basis of static tests， constant amplitude fatigue tests on HRB500 steel bar under fi^lly reversed tension and compression cyclic load for seven different kinds of stress levels were conducted. Research conclusions：( 1) The S - V curve of the HRB500 steel bar was fitted according to the fatigue test results； According to the codes in related standards on the reliability indication of railway engineering structures and fatigue strength reduction coefficient of longitudinal connected steel bar， as well as considering the relevant codes in Britain standard 5 400 on the extrapolation method of the long - life S - V curve of steel bar and on deducing S - V curves with different probabilities using middle value S - V curve，the S - V curve of HRB500 steel bar with reliability index of 4. 2 which is suitable for the fatigue life prediction of HRB500 steel bar in longitudinal connected slab track on bridge was deduced; (3) The research results can provide experimental basis for the establishment of life prediction model of HRB500 steel bar in longitudinal connected slab track on bridge.
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Received: 08 October 2016
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2017, Vol. 34 
