摘要
研究目的:新建铁路广州至珠海(含中山至江门)城际快速轨道交通工程是我国第一条真正意义上的城际快速轨道交通工程,其中容桂水道主桥(108+2×185+115)m连续刚构为国内最大跨度的无砟轨道桥梁结构。由于无砟轨道桥梁结构对后期收缩徐变变形要求非常高,在自然环境下,影响桥梁徐变的因素很多,各个因素之间互相影响,机理复杂。探讨其变化规律极其重要。研究结论:通过实验研究得出适当地增大张拉预应力时的混凝土龄期和适当地增大控制二期恒载加载时间,可以有效地减少结构的后期徐变变形。当温度一定、湿度增加时,跨中上拱位移减小;当湿度一定、温度增加时,跨中上拱位移增加。
Research purposes： The construction of the intercity rapid rail transit from Guangzhou to Zhuhai（including Zhongshan to Jiangmen） is the first time for China to construct the intercity rapid rail transit in the true sense.In which the main bridge with（108＋2×185＋115） m continual rigid frame crossing RongGui canal is the longest span ballastless track bridge structure in China.Under natural environment,there are lots of factors to influence the bridge creep and the all factors influence each other,so the influence mechanisms are very complicated.As the ballastless track bridge structure has high request for the later shrinkage and time deformations,it is very important to explore the change laws of the shrinkage and time deformation..Research conclusions：From the experimental research it is concluded to properly increase the concrete aging at stretching prestress and the secondary permanent load time can decrease the later shrinkage deformation of the structure.When the temperature is fixed and humidity increases,the displacement of the upper arch in the middle of the span decreases,and when the humidity is fixed and temperation increases,the displacement of the upper arch in the middle of the span increases.
出处
《铁道工程学报》
EI
北大核心
2010年第10期67-73,共7页
Journal of Railway Engineering Society
关键词
连续刚构
收缩与徐变变形
试验研究
continual rigid frame
shrinkage and time deformation
experimental research
