摘要
针对我国高速铁路桥上采用的板式无砟轨道普遍存在线间排水困难和板底易出现横向裂缝问题,提出一种新型双孔型板式无砟轨道,采用有限元软件ANSYS建立三维空间模型,分析在2种不同工况下新型轨道板的应力、变形和承载力性能,并在组合外力矩作用下进行预应力非对称配筋设计。研究结果表明,新型双孔型板式无砟轨道可以有效解决线间排水困难问题,与普通无砟板式轨道相比,新型轨道板具有更好的稳定性;在竖向荷载作用下,双孔型轨道板的最大应力、位移和裂缝宽度均满足设计要求;在配筋总量相对较少的情况下,轨道板的非对称预应力筋设计可以有效减小板底裂缝最大宽度,板底抗裂程度相对于普通轨道板增大33.3%,增强了轨道板的耐久性,且经济性能良好。
In order to solve the three - side drainage and crack of slab bottom problems of common slab ballastless track in high - speed railway bridge, the new double - hole slab was desigened that differs from common slab track, and double - hole slab 3 D models were built by using ANSYS software, the strain, deformation and bear- ing capacity of the new slab track were analyzed under two load case, and asymmetric prestressed reinforcement was designed under combined moment. The results show that the double - hole slabs can effectively solve the drainage problem, and have more stability than common slab ballastless track. The strain, deformation and crack width of the new slab track satisfies the requirements of standard. The maximum crack of slab bottom surface is decreased by the asymmetric prestressed reinforcement design under the same steel amount, the crack resistance capacity of double -hole slab track is 33.3% more than common slab ballastless track, and has better durability and economy.
出处
《铁道科学与工程学报》
CAS
CSCD
2009年第4期22-27,共6页
Journal of Railway Science and Engineering
基金
铁道部重点科研项目(2008G031-F)
关键词
高速铁路
双孔型轨道板
普通板式轨道
方孔挡台
有限元
high speed railway
double-hole slab track
common slab ballastless track
rectangular stopper
finite element
作者简介
作者简介：禹雷（1982-），男，河南泌阳人，博士研究生，从事结构工程及高速铁路无砟轨道研究
