Steel and Composite Structures

  • 제41권1호
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  • Pages.65-84
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  • 2021
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Mechanical properties of curved composite box girders with corrugated steel webs

  • Liu, Sumei (School of Architectural Engineering, Jinling Institute of Technology) ;
  • Corte, Wouter De (Department of Structural Engineering and Building Materials, Faculty of Engineering and Architecture, Ghent University) ;
  • Ding, Hanshan (School of Civil Engineering, Southeast University) ;
  • Taerwe, Luc (Department of Structural Engineering and Building Materials, Faculty of Engineering and Architecture, Ghent University)
  • 투고 : 2019.09.01
  • 심사 : 2021.08.26
  • 발행 : 2021.10.10
⟨ 이전 논문 다음 논문 ⟩

초록

Several methods derived for use on traditional concrete curved box girders (CBGs) are used in design practice. However, these typically consider only one elastic modulus and one shear modulus, and consequently cannot be applied directly to CBGs with corrugated steel webs (CSWs) due to the large shear deformations and small longitudinal stiffness of CSWs, while these shear deformations are small and usually ignored for common concrete webs. In this paper, firstly, the flexure-torsion governing differential equations considering the shear deformations and the accordion effect of CSWs, and the distortion governing differential equation considering the accordion effect of CSWs are derived for CBGs with CSWs. A practical method which can solve the deflections, torsional angles, distortional angles, stresses and internal forces of simple and continuous CBGs with intermediate diaphragms is proposed. Secondly, the results of a series of tests performed on three CBGs with CSWs, published test results, as well as finite element analysis results and theoretical results of straight box girders (SBGs) with CSWs are used to verify the correctness of the analytical method. The agreement between analytical, experimental and numerical results is good. Finally, a parametric analysis is conducted and the results show that: (a) the influence of shear deformations of CSWs on the deflections of CBGs with CSWs increases with increasing curvature radius R. For SBGs with CSWs, the deflections may increase by 30% when considering shear deformations. For CBGs with CSWs, the deflection increase ranges between 8% and 30% for concentrated loads depending on the curvature radius. (b) the distortional shear stress, which is small and typically neglected for CBGs with concrete webs, may be as big as, or larger than the flexural shear stress, and must be considered. The restrained torsional shear stress, which is also small and typically neglected for CBGs with concrete webs, can reach 9% of the flexural shear stress, and also must be considered.

키워드

과제정보

The study was supported by the National Natural Science Foundation of China (Grant No. 51378106), the China Scholarship Council (Grant No. 201806090108), and the Scientific Research Foundation for High-Level Talents of Jinling Institute of Technology (Grant No. jit-b-202131). The financial support is gratefully acknowledged. The authors also acknowledge the members of the research group for their hard work during the tests.

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