CRTSⅠ型无砟轨道板预应力筋破坏所致附加荷载的影响分析  

Analysis of Influence of Additional Load Caused by Prestressed Reinforcement Destruction of CRTSⅠTrack Slab

作　　者：赵磊[1] 高亮[2] 蔡小培[2] 辛涛[2] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道学报》2015年第12期74-80,共7页Journal of the China Railway Society

基　　金：中国铁路总公司科技研究开发计划(2014G001-A);国家自然科学基金(51208034);北京市高校青年英才计划(YETP0559)

摘　　要：针对CRTSⅠ型无砟轨道板在运营过程中出现部分预应力筋破坏的现象,本文建立CRTSⅠ型无砟轨道板及其预应力分析模型,对不同位置、不同数量纵横向预应力筋破坏引起的轨道板附加荷载进行计算分析。计算结果表明:纵向预应力筋的破坏会带来轨道板附加弯矩,引起轨道板翘曲变形;预应力筋破坏对纵横向应力峰值影响较小;轨道板整体预压力随着预应力筋破坏数量的增加而减小,其中预压力在端部损失较明显,轨道板中部由于层间黏结约束,预压力损失小于端部。预应力钢筋应力计算结果显示,预应力钢筋受力基本不受相邻预应力筋破坏的影响。To deal with prestressed reinforcement destruction in CRTS Ⅰ track slabs during high-speed railway operation, in this paper, the analysis model on CRTS Ⅰ track slab and its prestressed reinforcement was built, to calculate and analyze the additional load of track slab caused by destruction of longitudinal and transverse prestressed reinforcement in different locations and different numbers. The calculation results showed that lon- gitudinal prestressed reinforcement loss will bring additional bending moment to the track slab, which will lead to track warpage. Prestressed reinforcement loss posed less impact on the longitudinal and transverse stress peak value, while the overall preload force decreased with the increase of the number of ruptured prestressed tendons, with more obvious preload losses oecuring in the slab end. The preload loss in the center of the slab was less than the slab end due to the interlayer adhesion constraints. The calculation result of prestressed rein- forcement stress showed that the prestressed reinforcement force was substantially independent of the damage of the adjacent prestressed reinforcement damage.

关 键 词：高速铁路 CRTSⅠ 预应力筋破坏 病害 附加荷载 

分 类 号：U213.244[交通运输工程—道路与铁道工程] U213.34