摘要
针对劲性骨架混凝土拱桥主拱圈常用的箱型截面,总结归纳主拱圈混凝土主要分环和浇筑方式及其影响因素,提出分环和浇筑的基本原则,并采用有限元法模拟分析分环浇筑方式对单箱三室截面劲性骨架混凝土拱桥内力与变形的影响。结果表明:箱形截面能较好地满足劲性骨架拱桥主拱圈受力和构造的要求,是大跨度桥梁的理想截面形式;主拱圈混凝土分环和浇筑方式主要由劲性骨架结构承载能力、施工操作性、结构整体性和经济性4个因素决定;进行分环和浇筑应遵循的基本原则包括减少分环数量,对称分环和浇筑,尽快完全包裹劲性骨架弦管,尽快形成完整箱室以及将截面复杂部分划分至易于施工混凝土环内等;跨径416 m劲性骨架拱桥的三室箱形截面主拱圈采用合理的分环和浇筑方式,可以分别降低5.9%的劲性骨架钢管应力和16.8%的管内混凝土应力,减少7.8%的拱顶下挠位移。
In view of the box sections commonly used in the main arch ring of concrete arch bridge with rigid skeleton,the main ring segmentation and pouring modes of the main arch ring concrete and their influencing factors were summarized,and the basic principles for ring segmentation and pouring were proposed.The influences of ring segmentation and pouring modes on the internal force and deformation of the rigid skeleton concrete arch bridge with three-cell single box section were simulated and analyzed using the finite element method.The results show that box section is the ideal section form for long-span bridges,which can better meet the requirements of the force and structure of the main arch ring of the rigid skeleton arch bridge.The ring segmentation and pouring modes of the concrete of the main arch ring are mainly determined by four factors:the bearing capacity of the rigid skeleton structure,the construction operability,the structural integrity and the economy.The basic principles that should be followed for the ring segmentation and pouring include:reducing the number of ring segmentation,symmetrical ring segmentation and pouring,wrapping the rigid skeleton string tube and forming an integrated cell box as soon as possible,and segmenting the complex sections into concrete segmentations which are easy to construct,etc.The application of reasonable ring segmentation and pouring modes in the main arch ring with three-cell box section of a 416 m span arch bridge with rigid skeleton can reduce the stress of the rigid skeleton steel tube by 5.9%,the stress of the concrete in tube by 16.8%and the downward deflection displacement of the arch vault by 7.8%.
作者
林春姣
肖周强
蒋才健
黄家祥
LIN Chunjiao;XIAO Zhouqiang;JIANG Caijian;HUANG Jiaxiang(School of Civil Engineering and Architecture,Guangxi University,Nanning Guangxi 530004,China;Key Laboratory of Disaster Prevention and Structural Safety,Ministry of Education,Guangxi University,Nanning Guangxi 530004,China;Guangxi Nanning Contemporary Fengyun Investment Management Co.,Ltd.,Nanning Guangxi 530028,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2023年第3期81-90,共10页
China Railway Science
基金
国家自然科学基金资助项目(51878186)。
关键词
劲性骨架混凝土拱桥
主拱圈
箱型截面
分环
浇筑
混凝土
Concrete arch bridge with rigid skeleton
Main arch ring
Box section
Ring segmentation
Pouring
Concrete
