Improved design of intermediate diaphragm spacing in horizontally curved steel box bridges

Jeonghwa Lee, Seungjun Kim, Young Jong Kang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Eccentric live loading acting on the steel box girders induces cross-sectional distortion in the steel box sections. In particular, the distortional behavior in horizontally curved steel box bridges can be significant compared to that in straight ones; the reason is that the curvature effects of horizontally curved steel box bridges can provide additional distortional behavior due to gravity and live loads even without eccentricity of the applied loadings for every construction sequence (self-weight for non-composite and live loads for composite box sections). Therefore, to control the distortional warping normal stresses induced by the distortional behavior, it is necessary to install intermediate diaphragms in the box sections for straight and horizontally curved box bridges. This study aimed to estimate, using three-dimensional finite element analysis (FEA), the distortional bi-moments and stresses of single-cell horizontally curved rectangular steel box girder bridges with a single span, and to provide an improved design methodology to determine adequate intermediate diaphragm spacing in straight and horizontally curved steel box bridges considering various construction phases. Based on the parametric study, we considered not only various design parameters, such as design live loads, magnitude of the torsional moment, span length, spacing of intermediate diaphragms, subtended angle, and various normal stress ratios but also construction sequences with various loading conditions. Finally, the required intermediate diaphragm spacing for straight and horizontally curved steel box bridges were proposed.

Original languageEnglish
Article number107488
JournalJournal of Constructional Steel Research
Volume198
DOIs
Publication statusPublished - 2022 Nov

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program under the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2019R1I1A1A01059684 ); and by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant 21CTAP-C163783-01 ).

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

  • Distortion
  • Distortional warping stresses
  • Horizontally curved box bridges
  • Intermediate diaphragms

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys

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