To study the distortion effect of single-box twin-cell thin-walled box girders with cantilever plates, the distortion differential equation was established based on the plate-beam frame method, and the initial parametric solution of the equation under vertical eccentric concentrated load was derived. The concrete analytical formula of the distortion frame moment of inertia of single-box twin-cell box girder with cantilever plates was also presented. The analysis on the cantilever box girder and simply supported box girders examples was performed using analytical theory. The results show that the analytical solution is in good agreement with the results from existing literature and finite element analysis, which verifies the correctness of the analytical theory. Through the parameter analysis, it can be seen that the greater the thickness of the middle web, the stronger the ability of the twin-cell box girder to resist distortion. The transverse bending moment of the external webs is little influenced by the variation of thickness of the middle web, but the transverse bending moment of the middle web increases with the increase of its thickness. When the thickness of the middle web is equal to that of the external webs, the transverse bending moment of the middle web is approximately twice that of the external webs.
WEIX, YANGS Y .Research on the shear-lag effect in twin-cell PC box-girder with corrugated steel web[J]. Journal of Railway Engineering Society, 2017, 34(3): 29-33.(in Chinese)
[3]
JAYASREEC, NAGARAJANP, SREEKUMARIS A .Transverse bending analysis of twin-cell concrete box girder bridges using simplified frame analysis[J].Practice Periodical on Structural Design and Construction,2023, 28(2): 06022005.
LINP Z, YANGF, LUOM, et al. Analysis on local behavior of twin-cell box girder under symmetrical bending [J]. Journal of Building Structures, 2017, 38(7): 68-77. (in Chinese)
QINA A, LIUS Z, JIW,et al .Analysis on torsion performance of single-box twin-cell composite box girder with corrugated steel webs and steel bottom plates[J].Journal of Southeast University (Natural Science Edition), 2021, 51(5):740-746.(in Chinese)
MAL, WANS, JIANGZ W. Research on torsion and distortion performance of single box double-cell girder with corrugated steel webs [J]. China Journal of Highway and Transport, 2016, 29(10): 77-85. (in Chinese)
DENGW Q, MAOZ L, LIUD, et al. Analysis and experimental study on torsion and distortion of single box three-cell cantilever girder with corrugated steel webs[J]. Journal of Building Structures, 2020, 41(2): 173-181. (in Chinese)
[22]
LIX Y, LIL F, ZHOUM, et al. Refined beam finite element model for thin-walled multi-cell box girders considering distortion and secondary distortional moment deformation effect[J]. Engineering Structures, 2024, 298: 117042.