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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2019, Vol. 53 Issue (7): 1380-1388    DOI: 10.3785/j.issn.1008-973X.2019.07.018
Traffic Engineering, Civil Engineering     
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     
Received: 18 May 2018      Published: 25 June 2019
CLC:  U 44  
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Jin-feng WANG
Tian-mei WU
Jian-jiang WANG
Min-quan WANG
Rong-qiao XU
Cite this article:

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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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.07.018     OR     http://www.zjujournals.com/eng/Y2019/V53/I7/1380


基于部分抗剪的钢箱梁横向分块施工效应分析

为了研究横向分块施工造成的抗剪刚度减弱且分布不均对分块钢箱梁受力特性的影响，针对分块后不对称开口薄壁构件顶、底板之间部分抗剪的力学特性，引入考虑界面滑移的组合结构理论，建立变形和应力的解析分析方法. 基于典型等截面单箱多室钢箱梁截面设计参数的统计规律进一步归并结构尺寸参数，建立以桥梁跨度、分段长度和抗剪刚度等关键参数为基本变量的变形计算公式. 通过影响参数分析，提出能够应用于不同跨度钢箱梁的分块施工方法. 结果表明，当分段长度增大到40 m以上时，必须采用抗剪临时撑增大抗剪刚度，或采用临时支点加固，以减小变形、控制施工质量.


关键词： 钢箱梁桥,  横向分块施工,  部分抗剪,  参数分析,  施工方法 
Fig.1 Infinitesimal of composite structure
L/m H/m m h1/m h2/m a1/m ad/m af/m i1/m3 id/m3 if/m3
40 2.2 1/18 0.114 0.053 0.026 0.022 0.013 0.000 28 0.000 17 0.013
50 2.5 1/20 0.111 0.039 0.028 0.026 0.023 0.000 28 0.000 13 0.010
60 2.5 1/24 0.112 0.053 0.027 0.027 0.012 0.000 30 0.000 18 0.008
70 3.2 1/22 0.108 0.053 0.029 0.027 0.022 0.000 32 0.000 19 0.013
80 3.2 1/25 0.107 0.042 0.033 0.035 0.021 0.000 35 0.000 11 0.016
90 3.8 1/24 0.103 0.038 0.031 0.031 0.019 0.000 31 0.000 10 0.011
Tab.1 Calculation parameters of general-span steel box girders
Fig.2 Relationship between wP and lf
Fig.3 Variation of deflection due to partial shear connection
Fig.4 Relationship between wP and ks
Fig.5 Relationship between σPi and lf
Fig.6 Variation of stress due to partial shear connection
Fig.7 Relationship between σP2 and ks
Fig.8 Flow chart of block construction design
Fig.9 Section of（40+65+40）m steel box girder after transverse blocking
Fig.10 Comparison of theoretical deflection result and practical data of 27 m hoisting segment
Fig.11 Comparison of theoretical stress result and practical data of 27 m hoisting segment
Fig.12 Field hoisting of transverse block construction
Fig.13 Section of（40+60+40）m steel box girder after transverse blocking
Fig.14 Comparison of theoretical deflection result and practical data of 38 m hoisting segment
Fig.15 Comparison of theoretical stress result and practical data of 38 m hoisting segment
Fig.16 Block of steel box girder strengthened by X-type brace
Fig.17 Structural map of X-type brace
Fig.18 Section of (55+65) m steel box girder after transverse blocking
Fig.19 Comparison of theoretical deflection result and practical data of 55 m hoisting segment
Fig.20 Comparison of theoretical stress result and practical data of 55 m hoisting segment
Fig.21 Supported by mid-span temporary pier
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