铁道标准设计Issue(2)：33-36,4.DOI:10.13238/j.issn.1004-2954.2014.02.009
桥上CRTS域型板式无砟轨道宽接缝开裂对纵连钢筋受力特性的影响
Effect on longitudinally Continuous Reinforcing Bars' Mechanical Property Caused by the Cracking at Wide Juncture of CRTS-IISlab Ballastless Track on Bridge
摘要
Abstract
CRTS-II slab ballastless track belongs to longitudinally continuous slab-type track structure, and the slabs are usually connected by 6 finish-rolled thread reinforcing bars. However, under the action of external loads, the interface between new and old concrete of wide juncture tends to crack. Subsequently, the cracking will cause stress redistribution of the slab's longitudinally continuous reinforcing bars, posing a threat to the normal work of the reinforcing bars. Based on finite element method and using element birth-death technology, the paper established a calculation model of CRTS-IIslab ballastless track on bridge containing prestressed reinforcing bars under the different crack conditions ( complete cracking or non-cracking ) at the wide juncture, and then researched the influence on the longitudinally continuous bar's mechanical property caused by different external loads. The research results show that: ( a ) The cracking at the wide juncture would cause abrupt stress changing of reinforcing bars. ( b ) Structure's overall temperature drop has greatest influence on the stress state of reinforcing bars, and if the magnitude of temperature drop is too large, the yield failure will even occur in the reinforcing bars. ( c) Positive temperature gradient has greater influence on the stress of reinforcing bars, causing considerable stress decreasing of the reinforcing bars at the cracked location of the wide juncture. ( d) Under the actions of negative temperature gradient and train load, there is no significant stress changing of reinforcing bars at the wide juncture.关键词
CRTS域型板式无砟轨道/宽接缝/纵连钢筋/有限单元法Key words
CRTS-II slab ballastless track/wide juncture/longitudinally continuous reinforcing bars/finite element method分类
交通工程引用本文复制引用
黄河山,曾毅,徐光鑫,任娟娟..桥上CRTS域型板式无砟轨道宽接缝开裂对纵连钢筋受力特性的影响[J].铁道标准设计,2014,(2):33-36,4.基金项目
铁道部科技开发计划重大项目(2011G002,2011G001-1) （2011G002,2011G001-1）
国家自然基金(51208438) （51208438）
高等学校博士学科点专项科研基金(20100184120021) （20100184120021）
中央高校基本科研业务费专项资金科技创新项目(2682013CX046) （2682013CX046）
