摘要
大跨度节段悬拼桥梁由于其工业化程度高、节段质量可控等优点,得到了越来越广泛的应用。节段梁从浇筑到完成吊装存在一定存梁期,有利于混凝土收缩徐变的发展,因此相比较传统悬臂现浇桥梁,其徐变变形存在其独特性。文中以宁波舟山港主通道公路工程北通航孔桥为例,以实际施工步骤为依托,模拟得到了节段悬拼混凝土刚构桥在施工期及长期服役过程的徐变变形特征,并与传统悬臂现浇混凝土连续刚构桥进行了对比分析,结果表明节段悬拼桥梁收缩徐变变形下挠明显小于悬臂现浇桥梁,且在施工阶段已经产生明显区别。文中研究可为节段悬拼桥梁施工线形控制和后期管养提供理论支撑。
Large-span segmental cantilever assembly bridges have been widely used due to their advantages such as high industrialization and controllable segmental quality.The existence of beam-preserving period from the casting to the completion of the lifting of the segmental girders is conducive to the development of concrete shrinkage creep.Therefore,it’s creep deformation has its unique characteristics compared with the traditional cantilever cast bridges.In this paper,we simulated the creep deformation characteristics of segmental cantilever assembly concrete continuous rigid frame bridges during the construction period and long-term service and compared them with traditional cantilever cast concrete continuous rigid frame bridges.In this paper,the North Navigable Bore Bridge of Ningbo Zhoushan Port main channel highway project is taken as an example,based on the actual construction steps.The results show that the deflection under shrinkage and creep deformation of segment suspension bridge is obviously smaller than that of cantilever cast-in place bridge,and the difference has been obvious in the construction stage.The results of the study can provide theoretical support for the construction alignment control and later management and maintenance of segmental cantilever assembly bridges.
作者
方汝峰
毛江鸿
谭俊
张兴志
王文洋
周俊宏
FANG Rufeng;MAO Jianghong;TAN Jun;ZHANG Xingzhi;WANG Wenyang;ZHOU Junhong(College of Engineering and Architecture,Zhejiang University,Hangzhou 315008,China;Ningbo Tech University,Zhejiang Ningbo 315100,China;Zhejiang Zhoushan North Channel Co.,Ltd.,Zhejiang Zhoushan 316021,China;Ningbo Rail Transit Group Co.,Ltd.,Zhejiang Ningbo 315043,China)
出处
《低温建筑技术》
2021年第7期48-52,共5页
Low Temperature Architecture Technology
基金
国家自然科学基金项目(51820105012)
浙江省交通厅科技项目(2018035)
宁波市科技项目(2019C50019)。
关键词
连续刚构
节段悬拼
悬臂现浇
收缩徐变
continuous rigid frame bridges
segmental cantilever assembly
cantilever cast
shrinkage creep
