浙江大学学报(工学版)  2019, Vol. 53 Issue (7): 1380-1388    DOI: 10.3785/j.issn.1008-973X.2019.07.018
 交通工程、土木工程

1. 浙江大学 建筑工程学院，浙江 杭州 310058
2. 浙江公路水运工程咨询公司，浙江 杭州 310000
Analysis of transverse separated-block construction effects of steel box girders based on partial shear theory
Jin-feng WANG1(),Tian-mei WU1,Jian-jiang WANG2,Min-quan WANG1,Rong-qiao XU1
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Zhejiang Highway and Water Transportation Engineering Consulting Corporation, Hangzhou 310000, China
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Abstract:

An analytical method for deformation and stress was established in order to analyze the effect of weakened and uneven shear rigidity caused by the transverse separated-block construction on the mechanical characteristics of separated-block steel box girders. The theory of composite structure considering slip at the interlayer was adopted based on the partial shear connection between the top and bottom plate of the asymmetrical thin-walled, open-section block after partition. The deformation equation based on the key parameters such as the span of the bridge, segment length and shear stiffness was established by analyzing the section design parameters from the typical single-box multi-cell steel box girder with constant sections, obtaining the statistical law and eliminating some geometric parameters. The block construction method, which can be applied to steel box girder with different spans, was proposed by analyzing the impact parameters. Results show that temporary shear braces should be used to increase the shear stiffness, or a temporary pier is required to reduce the deflection and control the construction quality when the segment length exceeds 40 m.

Key words: steel box girder    transverse separated-block construction    partial shear    parameter analysis    construction method

 CLC: U 44

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#### 引用本文:

Jin-feng WANG,Tian-mei WU,Jian-jiang WANG,Min-quan WANG,Rong-qiao XU. Analysis of transverse separated-block construction effects of steel box girders based on partial shear theory. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1380-1388.

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 图 1  组合结构微元体受力模型 表 1  常见跨径钢箱梁计算参数 图 2  wP与lf的关系曲线 图 3  部分抗剪导致的挠度变化规律 图 4  wP与ks的关系曲线 图 5  σPi与lf的关系曲线 图 6  部分抗剪导致的应力变化规律 图 7  σP2与ks的关系曲线 图 8  分块施工设计流程图 图 9  （40+65+40）m钢箱梁横向分块截面图 图 10  27 m吊装段挠度理论值与实测值的对比 图 11  27 m吊装段底板应力理论值与实测值的对比 图 12  横向分块施工现场吊装图 图 13  （40+60+40）m钢箱梁横向分块截面图 图 14  38 m吊装段挠度理论与实测值对比 图 15  38 m吊装段底板应力理论与实测值对比 图 16  抗剪临时支撑加固钢箱梁块 图 17  X型抗剪临时支撑构造图 图 18  （55+65）m钢箱梁横向分块截面图 图 19  55 m吊装段挠度理论与实测值对比 图 20  55 m吊装段底板应力理论与实测值对比 图 21  跨中临时支墩支撑
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