基于部分抗剪的钢箱梁横向分块施工效应分析
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摘要
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.
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.
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.
引文
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[14]XU R,WU Y F.Free vibration and buckling of composite beams with interlayer slip by twodimensional theory[J].Journal of Sound and Vibration,2008,313(3-5):875-890.
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[16]ZONA A,RANZI G.Shear connection slip demand in composite steel-concrete beams with solid slabs[J].Journal of Constructional Steel Research,2014,102(11):266-281.
[17]邹杨,周志祥,唐亮.考虑滑移效应组合梁弯曲应力和界面剪力分析[J].工程力学,2013,30(11):173-179.ZOU Yang,ZHOU Zhi-xiang,TANG Liang.Analysis of flexural stresses and interface shear force of composite beams considering slip effect[J].Engineering Mechanics,2013,30(11):173-179.
[18]XU R,CHEN D.Variational principles of partialInteraction composite beams[J].Journal of Engineering Mechanics,2012,138(5):542-551.
[19]徐荣桥,陈德权.组合梁挠度计算的改进折减刚度法[J].工程力学,2013,30(2):285-291.XU Rong-qiao,CHEN De-quan.Modified reduced stiffness method for calculating the deflection of composite beams[J].Engineering Mechanics,2013,30(2):285-291.
[2]宫禄尧,杨培娜,邱唐虎.复杂交通状况下大跨立交桥钢箱梁施工关键技术[J].世界桥梁,2015,43(1):23-26.GONG Lu-yao,YANG Pei-na,QIU Tang-hu.Construction techniques for long span overpass steel box girder under the complex traffic condition[J].World Bridges,2015,43(1):23-26.
[3]KIM T H.Comparison of totally prefabricated bridge substructure designed according to Korea highway bridge design(KHBD)and AASHTO-LRFD[J].International Journal of Concrete Structures and Materials,2013,7(4):319-332.
[4]汪劲丰,张良,向华伟,等.城市钢箱梁桥横向分块施工分析[J].桥梁建设,2017,47(1):109-113.WANG Jin-feng,ZHANG Liang,XIANG Hua-wei,et al.Analysis of construction of an urban steel box girder bridge in blocks in transverse direction[J].Bridge Construction,2017,47(1):109-113.
[5]胡永生.公铁合建段公路大跨度钢箱梁施工技术[J].桥梁建设,2014,44(2):96-100.HU Yong-sheng.Construction techniques for long span roadway steel box girders of rail-cum-road section of Tongling Changjiang River Bridge[J].Bridge Construction,2014,44(2):96-100.
[6]王凌波,刘鹏,李源,等.宽幅钢箱梁斜拉桥悬拼匹配技术研究[J].中国公路学报,2016,29(12):102-108.WANG Ling-bo,LIU Peng,LI Yuan,et al.Research on matching technology in cantilever erection for wide steel box of cable-stayed bridge[J].China Journal of Highway and Transport,2016,29(12):102-108.
[7]张玉平,袁鹏,罗超云,等.嘉绍大桥钢箱梁施工过程中局部稳定及强度分析[J].公路交通科技,2014,31(2):47-53.ZHANG Yu-ping,YUAN Peng,LUO Chao-yun,et al.Analysis on local stability and strength of steel box girder in construction process of JiaxingShaoxing Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(2):47-53.
[8]BIEZMA M V,SCHANACK F.Collapse of steel bridges[J].Journal of Performance of Constructed Facilities,2007,21(5):398-405.
[9]BRADY S.West gate bridge collapse:the story of the box girders[J].Structural Engineer Journal of the Institution of Structural Engineer,2016,94(10):26-28.
[10]蒋丽忠,余志武,李佳.均布荷载作用下钢-混凝土组合梁滑移及变形的理论计算[J].工程力学,2003,20(2):133-137.JIANG Li-zhong,YU Zhi-wu,LI Jia.Theoretical analysis of slip and deformation of steel-concrete composite beam under uniformly distributed loads[J].Engineering Mechanics,2003,20(2):133-137.
[11]刘寒冰,马辉,刘天明,等.竖向集中荷载作用下钢-混凝土组合梁的解析解[J].中国公路学报,2010,23(4):39-44.LIU Han-bing,MA Hui,LIU Tian-ming,et al.Analytical solution of steel-concrete composite beam under vertical loads[J].China Journal of Highway and Transport,2010,23(4):39-44.
[12]苗林,陈德伟.考虑层间滑移效应的组合梁解析计算[J].同济大学学报:自然科学版,2011,39(8):1113-1119.MIAO Lin,CHEN De-wei.Closed-form solution of composite beam considering interfacial slip effects[J].Journal of Tongji University:Natural Science,2011,39(8):1113-1119.
[13]XU R,WU Y F.Two-dimensional analytical solutions of simply supported composite beams with interlayer slips[J].International Journal of Solids and Structures,2007,44(1):165-175.
[14]XU R,WU Y F.Free vibration and buckling of composite beams with interlayer slip by twodimensional theory[J].Journal of Sound and Vibration,2008,313(3-5):875-890.
[15]XU R,WU Y F.Static,dynamic,and buckling analysis of partial interaction composite members using Timoshenko's beam theory[J].International Journal of Mechanical Sciences,2007,49(10):1139-1155.
[16]ZONA A,RANZI G.Shear connection slip demand in composite steel-concrete beams with solid slabs[J].Journal of Constructional Steel Research,2014,102(11):266-281.
[17]邹杨,周志祥,唐亮.考虑滑移效应组合梁弯曲应力和界面剪力分析[J].工程力学,2013,30(11):173-179.ZOU Yang,ZHOU Zhi-xiang,TANG Liang.Analysis of flexural stresses and interface shear force of composite beams considering slip effect[J].Engineering Mechanics,2013,30(11):173-179.
[18]XU R,CHEN D.Variational principles of partialInteraction composite beams[J].Journal of Engineering Mechanics,2012,138(5):542-551.
[19]徐荣桥,陈德权.组合梁挠度计算的改进折减刚度法[J].工程力学,2013,30(2):285-291.XU Rong-qiao,CHEN De-quan.Modified reduced stiffness method for calculating the deflection of composite beams[J].Engineering Mechanics,2013,30(2):285-291.
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