持续高温对CRTSⅡ型板式无砟轨道温度场影响的试验研究

Experimental Study on Inf luence of Sustained High Temperature on Temperature Field of CRTS Ⅱ Slab-type Ballastless Track

CRTSⅡ型板式无砟轨道将轨道板、底座板作为整体结构纵向连续铺设,受温度荷载影响较大,特别是在持续高温的天气条件下。本文在对持续高温定义的基础上提出了CRTSⅡ型板式无砟轨道温度场区域划分的3个控制指标,借助全国典型城市气象资料对CRTSⅡ型板式无砟轨道温度场区域进行了划分。通过对我国华东地区一桥上CRTSⅡ型板式无砟轨道温度场的长期监测,获得了持续高温期间轨道板板温的增大值与持续高温天数、日最高气温平均值(持续高温期间)间的关系,为完善我国现行规范中对CRTSⅡ型板式无砟轨道温度荷载的取值,提供了试验基础和数据支撑。

CRTS Ⅱ slab-type ballastless track takes the track slab and bed slab as the overall structure which are laid longitudinally and continuously and is greatly influenced by the temperature load,especially in the sustained high temperature weather.Based on the definition of the sustained high temperature,this paper put forward three control indexes for the temperature field region division of CRTS Ⅱ slab-type ballastless track and temperature field region was divided through the meteorological data of typical cities in China.Through the long-term monitoring for temperature field of CRTS Ⅱ slab-type ballastless track on one bridge in East China,this paper got the relationship among the increased value of track slab temperature,sustained high temperature days and the average daily maximum temperature during sustained high temperature period,which could provide a experimental basis and data supporting for the temperature load value of CRTS Ⅱ slab-type ballastless track in existing specification of our country.