Based on the concept of effective working width, the bridge deck is simplified as a multi-span continuous beam. The constraints of the main beam on the bridge deck are equivalent to anti-bending springs. When the stress mechanics of the deck between two main girders is analyzed, this deck is equivalent to a single-span beam. The anti-bending capacities from side spans are also simplified into anti-bending springs. A series of comprehensive equivalent stiffness parameters from the anti-torsion of the main girders and the anti-bending of the side spans are derived recursively. The variations of comprehensive equivalent stiffness parameters against the stiffness ratio of the anti-torsion stiffness from the main girder to the anti-bending transverse stiffness from the bridge deck are studied. The formulae of slopes and moments at endpoint and middle-span point are formulated for the deck constrained by the main girders and side spans under distributing load, concentrated load and partially distributed load, which provides a simplified theory for transverse bending moment calculation of multi-span continuous bridge decks. A background bridge consisting of prestressed-concrete I-type girders and reinforced-concrete bridge decks is studied. The transverse bending moment distributions and transverse bending moment modification factors of different-span bridge decks under model self-weight and automobile section distributing loads are analyzed, and the effect of beam height, deck thickness, beam number and load on transverse bending moment modification factors is investigated. The results demonstrate that: the analytical transverse bending moment from the present theoretical formulae agrees with the finite element, and the equivalent single-span beam method is feasible to simplify the multi-span continuous deck. The maximum result of the transverse bending moment modification factors is 0.666 7 at the supporting point, which is less than the value of 0.7 specified by the Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG 3362—2018). When t/h<1/4 (the ratio of the bridge deck thickness t to the main girder height h), the maximum value of the transverse bending moment modification factors is 0.670 3, which is larger than the value 0.5 specified by JTG 3362—2018. The calculating results based on the specification JTG 3362—2018 are unsafe for the design practice. When t/h>1/4, the maximum value of the transverse bending moment modification factors is 0.679 4, which is less than the value of 0.7 specified by JTG 3362—2018. To ensure the design of the bridge deck safe, further investigation into the transverse bending moment prescribed in JTG 3362—2018 is recommended.
Specifications for design of highway reinforced concrete and prestressed concrete bridges and culverts: JTG 3362—2018 [S].Beijing:China Communications Press, 2018.(in Chinese)
[5]
AA SHTO LRFD Bridge design specifications(8th edition):LRFDUS-2017[S]. Washington D C:AASHTO,2017.
[6]
XIANGD, LIUY Q, YANGF .Numerical and theoretical analysis of slab transverse-moment distributions in twin-girder crossbeam composite bridges[J].Journal of Bridge Engineering,2020, 25(3): 04020004.
[7]
席荔.公路桥梁桥面系设计方法及技术经济性分析[D].西安:长安大学,2014.
[8]
XIL. Design method for highway bridge deck and analysis of economics and technology[D]. Xi’an: Chang’an University,2014.(in Chinese)
[9]
吴浩伟. 轮载作用下双工字钢板组合梁桥面板横向弯曲效应研究[D]. 西安:长安大学,2020.
[10]
WUH W. Research on transverse bending effect of deck in twin-I girder composite bridges under wheel load [D].Xi’an:Chang’an University,2020.(in Chinese)
[11]
Specifications for highway bridges, part Ⅱ: steel bridge:JRA2012 [S]. Tokyo: Japan Road Association, 2012.
SHIX F, MAH Y, LIUC. Parametric study and optimization on behavior of twin-I girder composite bridges[J]. Journal of Tongji University (Natural Science),2018,46(4):444-451.(in Chinese)
LIUY J, FANQ F, FENGB W,et al .Transverse moment of steel-concrete composite twin I-girder bridge deck[J].Journal of Chang’an University (Natural Science Edition),2022,42(6):1-11.(in Chinese)
LIUY J, WUH W, FENGB W,et al .Tensile effect of welding studs in transverse direction of twin-I steel composite girder bridge under wheel load[J].Journal of Architecture and Civil Engineering,2020,37(2):1-10.(in Chinese)
[20]
张轩瑜 .双工字形钢-预制混凝土板组合梁桥静力性能研究[D].西安:长安大学,2019.
[21]
ZHANGX Y .Research on the static performance of twin-I steel-composite girder bridges with precast concrete deck panel [D].Xi’an: Chang’an University,2019.(in Chinese)
[22]
范泉锋. 双工字钢组合梁组合桥面板横向弯曲效应研究[D].西安: 长安大学, 2022.
[23]
FANQ F. Research on transverse bending effect of composite slab of twin-I-girder composite bridges [D]. Xi’an:Chang’an University, 2022.(in Chinese)
JIAH J, DAIH, ZHANGJ D .Research on transverse internal forces in box-girder bridges with corrugated steel webs[J].Engineering Mechanics,2014,31(12): 76-82.(in Chinese)
ZHAOP, YEJ S. Frame analysis method of transverse internal force in bridge deck of box girders with corrugated steel webs[J]. Journal of Southeast University(Natural Science Edition), 2012,42(5): 940-944.(in Chinese)
ZHAOP, RONGX L, YEJ S. Calculation method of transverse internal force in bridge deck of box girder with corrugated steel webs[J]. Journal of Tongji University (Natural Science), 2019, 47(4): 467-474.(in Chinese)
[30]
范立础.桥梁工程 [M]. 2版.北京:人民交通出版社,1980.
[31]
FANL C. Bridge engineering [M]. 2nd ed. Beijing: China Communications Press,1980.(in Chinese)
[32]
DE SALVOV, MUSCOLINOG, PALMERIA. A substructure approach tailored to the dynamic analysis of multi-span continuous beams under moving loads[J].Journal of Sound and Vibration, 2010, 329(15): 3101-3120.
PANQ, YIZ P, YANGS J, et al. A simplified substructure model and dynamic response analysis of the submerged floating tunnel[J]. Journal of Central South University (Science and Technology),2022,53(10):4132-4141.(in Chinese)
[35]
BIONDIB, MUSCOLINOG, SOFIA .A substructure approach for the dynamic analysis of train-track-bridge system[J].Computers & Structures, 2005, 83(28/29/30): 2271-2281.
YUANS, YUANQ .Compatibility in analogy of gridworks to thin plate bending and its numerical solution[J]. China Civil Engineering Journal, 2023, 56(3): 1-8.(in Chinese)
ZHANGY M, BAOP, CUIY. The theoretical similarity between a plate and a grillage beam[J]. Journal of Henan University (Natural Science), 2002, 32(1): 83-86.(in Chinese)
HUANGS X. Equivalent beam method for determining tne natural frequencies of continuous beams or one-story rigid frames without sideway[J]. Journal of South China Institute of Technology,1981,9(4): 105-120.(in Chinese)
[44]
夏桂云, 李传习. 考虑剪切变形影响的杆系结构理论与应用[M]. 北京:人民交通出版社,2008.
[45]
XIAG Y, LIC X .Theory and application of bar structures considering the shear deformation effect [M].Beijing:China Communications Press,2008.(in Chinese)
基金资助
国家自然科学基金资助项目(51278072)
National Natural ScienceFoundation of China(51278072)
湖南省教育厅重点项目(22A0223)
Key Project of Education Department of Hunan Province(22A0223)