新型纤维复合筋增强无砟轨道板变幅疲劳性能试验研究  

Experimental Study on Variable Amplitude Fatigue Test of New Type Fiber Reinforced Ballastless Track Slabs

作　　者：杨洋 张志勤 吴刚[3] 曹大富[1] 陆伟刚 YANG Yang;ZHANG Zhiqin;WU Gang;CAO Dafu;LU Weigang(College of Architecture Science and Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Yangjian Group Co.,Ltd.,Yangzhou 225002,China;College of Civil Engineering,Southeast University,Nanjing 211189,China;College of Hydraulic,Energy and Power Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]江苏扬建集团有限公司,江苏扬州225002 [3]东南大学土木工程学院,江苏南京211189 [4]扬州大学水利与能源动力工程学院,江苏扬州225009

出　　处：《铁道学报》2022年第9期111-119,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(51908486);中国博士后科学基金(2020M671620);江苏省科技项目(BK20180931);江苏省博士后科研资助计划(2020Z290)。

摘　　要：为评估变幅疲劳对无砟轨道板疲劳性能的影响,通过试验测试了7块无砟轨道板,每块轨道板具有相等的横截面刚度,所使用筋材分别为钢-连续纤维复合筋(SFCB)、玄武岩纤维复合筋(BFRP)和传统钢钢筋;试验参数主要考虑荷载水平和加载顺序的影响。试验结果表明,SFCB增强的轨道板具有更高的疲劳极限,当荷载水平超过疲劳极限时,SFCB增强轨道板的挠度,裂缝宽度和应力仍处于受控状态;相比之下,传统钢筋和BFRP筋增强轨道板的疲劳寿命和刚度均显著降低;疲劳极限内,荷载加载顺序对SFCB和BFRP筋增强轨道板的疲劳性能影响不大,在此期间,疲劳损伤仍由最大荷载水平控制。The objective of this research was to evaluate the effect of variable amplitude fatigue on the fatigue performance of ballastless track slabs. Seven ballastless track slabs reinforced with steel-fiber reinforced polymer composite bars(SFCBs), basalt fiber reinforced polymer(BFRP) bars, and traditional steel bars were constructed and tested. Each slab was designed to have the same initial cross-sectional stiffness under constant and variable cyclic loading. The test parameters mainly considered the influence of load level and loading sequence. The results show that the SFCB reinforced slabs have a higher fatigue limit. The deflection, crack width and stress of the SFCB slabs are still under control as the load exceeds the fatigue limit value. In contrast, the fatigue life and stiffness of the track slabs reinforced with traditional steel bars and BFRP bars are significantly reduced. The loading sequence has little inference on the fatigue performance of SFCB and BFRP slabs within the fatigue limit, during which the fatigue damage is still governed by the peak maximum load.

关 键 词：无砟轨道板 钢-连续纤维复合筋(SFCB) 玄武岩纤维复合筋(BFRP) 疲劳极限 疲劳性能 

分 类 号：U213.244[交通运输工程—道路与铁道工程]