重载铁路8m低高度钢筋混凝土板梁疲劳性能试验研究  

Experimental study on fatigue behavior of 8 m low-height reinforced concrete plate-girder of heavy-haul railway

作　　者：卢朝辉[1,2] 马义飞[1,2,3] 宋力 余志武[1,2] LU Zhaohui MA Yifei SONG Li YU Zhiwu(School of Civil Engineering, Central South University, Changsha 410075, China National Engineering Laboratory for High Railway Construction, Central South University, Changsha 410075, China The Construction Quality ＆ Safety Supervision Center ofNingxia Hui Autonomous Region, Yinchuan 750001, China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075 [3]宁夏回族自治区建设工程质量安全监督总站,宁夏银川750001

出　　处：《中南大学学报（自然科学版）》2017年第9期2550-2558,共9页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2013BAG20B00);国家自然科学基金资助项目(U1134209;51422814;51278496);长江学者和创新团队发展计划资助项目(IRT1296);中南大学"创新驱动计划"项目(2015CXS014)~~

摘　　要：为深入了解重载列车对既有铁路8 m低高度钢筋混凝土板梁疲劳性能的影响,对5根缩尺模型梁进行静力和等幅疲劳荷载试验研究。研究结果表明,梁内钢筋发生疲劳脆断后试验梁仍有较高的剩余承载力,且试验梁纯弯段裂缝宽度、混凝土及钢筋残余应变随疲劳作用次数增加呈"快速变化-缓慢变化"的两阶段变化特征。将本次试验及文献中的试验数据与国内外已有变形钢筋疲劳S-N曲线进行对比分析,进而提出更具参考价值的钢筋疲劳S-N曲线。In order to understand the fatigue performance of 8 m low-height reinforced concrete plate-girder under heavy-haul trains, five experimental beams were tested under static load and fatigue load with constant amplitudes. The results indicate that the beams still have high bearing capacity even when brittle fracture of some reinforcements occur. Two distinctive stages, i.e., the rapidly changing stage and the slowly changing stage, were observed for the variation of the cracks width of pure bending section and the residual strain of concrete and reinforcing steel with the increase of the fatigue cycle loads. The studies of the existing S-N curves were compared with the experimental data including the present experiment and published in the references, based on which a new model for the prediction of S-N curve was proposed.

关 键 词：重载铁路 钢筋混凝土板梁 疲劳试验 疲劳寿命 

分 类 号：U24[交通运输工程—道路与铁道工程]