华中科技大学学报：自然科学版2011，Vol.39Issue(7)：109-112,127,5.
大跨度无碴轨道连续梁桥后期变形控制方法
Control method for long term-deformations of long-span continuous bridges with bailastless tracks
摘要
Abstract
Long term-deformation of pre-stressed concrete continuous girders affect the smoothness of non-ballast tracks. Taking an example, a newly-built high speed railway long-span pre-stressed concrete continuous rigid frame bridge with ballastless track was studied, and the effects of different methods on the later-stage deformation control were compared through FEA （finie element analysis）. Then, a set of coordinate control measures was put forward. Results show that extending track laying time, reserving post-tensioned cables and tensioning external tendons are all effective in decreasing the later-stage deformation of the bridges. Track laying time is appropriate to be delayed for about 0.5 a, post-tensioned cables and external tendons can be tensioned in sequence according to practical deform- ation of bridges. When the coordinate control measures were used, the example bridge＇s 20 a deformation after the track laying was controlled within 21.9 mm for the middle span and 12.8 mm for the side span, which was far less than the deformation limitation.关键词
无碴轨道/后期变形/变形控制/预应力混凝土连续粱桥/体外索/后张钢柬Key words
ballastless track/long term-deformation/deformation control/pre-stressed concrete con-tinuous bridge/external tendons/post-tensioned cables分类
交通工程引用本文复制引用
侯文崎,叶梅新,曹建安..大跨度无碴轨道连续梁桥后期变形控制方法[J].华中科技大学学报：自然科学版,2011,39(7):109-112,127,5.基金项目
铁道部科技研究开发计划资助项目（2006G009-C-2）. （）
