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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第11期    总第80期    2016年11月

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文章编号:1672-7029(2016)11-2189-08
基于模型试验的曲线部分斜拉桥施工过程模拟分析
彭晶蓉,贺拴海,王凌波

(长安大学 公路学院,陕西 西安 710064)

摘 要: 为研究曲线部分斜拉桥采用对称悬臂施工方法施工的结构受力特点,根据相似理论,对依托工程制作了1/40的全桥缩尺模型。通过模型试验模拟施工过程中主梁浇筑、斜拉索张拉、主梁合龙、桥面铺装等关键工序,并测试主梁截面应力及变形、斜拉索索力等关键断面随施工过程发展的变化规律。结果表明,有索区梁段在施工过程中顶、底板均呈拉压交替变化,实桥设计中应着重关注;模型桥的悬臂施工对称点的测试数据基本一致,表明该模型对称性较好;模型理论计算值与试验实测值规律吻合,验证了结构计算理论,且实测值均偏安全,表明模型结构刚度较大、安全性较高;理论模型与模型试验相结合对研究复杂结构的受力具有可行性。

 

关键字: 部分斜拉桥;模型试验;悬臂施工;施工过程

Simulation and analysis of the curved extra-dosed bridge construction based on model test
PENG Jingrong,HE Shuanhai,WANG Linbo

School of Highway, Chang’an University, Xi’an 710064, China

Abstract:In order to study the structure of the curved extra-dosed bridge with cantilever construction method, a full bridge model was made with the ratio 1/40 to the in-situ bridge based on the similarity theory. The variations of the stress and deformation of girder and cable force under different construction loads such as main girder casting, cable tension, closure, deck pavement in different construction process were measured. The results show that the stress of top deck and bottom slab of girder in cable anchored area are in alternating tension-compression cycles which should be laid emphasis on in practical designing. The calculated values of the model are in good agreement with the experimental ones, which verifies the calculation theory. The cantilever construction of the model bridge is symmetrical, with high rigidity and high safety. It is feasible to combine the theoretical model and the model test for the research of the complex structure.

 

Key words: extra-dosed bridge; model test; cantilever construction; construction process

ISSN 1672-7029
CN 43-1423/U

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