Structural Engineering and Mechanics

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Strategy to increase distortional rigidity of crane box girder: Staggered truss diaphragm

  • Yangzhi Ren (College of Architecture and Civil Engineering, Beijing University of Technology) ;
  • Wenjing Guo (School of Stomatology, Southwest Medical University) ;
  • Xuechun Liu (College of Architecture and Civil Engineering, Beijing University of Technology) ;
  • Bin Wang (College of Engineering, Design and Physical Sciences, Brunel University) ;
  • Piyong Yu (College of Architecture and Civil Engineering, Beijing University of Technology) ;
  • Xiaowen Ji (College of Architecture and Civil Engineering, Beijing University of Technology)
  • Received : 2021.07.18
  • Accepted : 2023.04.04
  • Published : 2023.05.25
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Abstract

This paper proposes a novel method for increasing the distortional frame rigidity of off-rail box girder bridges for cranes by reinforcing the diaphragm with staggered truss. The study starts by using the Matrix Displacement Method to determine the shear angle of the staggered truss diaphragm under two assumptions: hinge joint and rigid joint. To obtain closed-form solutions for the transversal and longitudinal deformations and warping stress of the crane girder, the study employs the Initial Parameter Method and considers the compatibility of shear deformation at joints between the diaphragms and the girder. The theoretical solutions are validated through finite element analysis, which also confirms that the hinge-joint assumption accurately represents the shear angle of the staggered truss diaphragm in girder distortion. Additionally, the study conducts extensive parameter analyses to examine the impact of staggered truss dimensions on distortional stress and deformation. Furthermore, the study compares the distortional warping stresses of crane girders reinforced with staggered truss diaphragms and those reinforced with perforated ones, emphasizing the importance of incorporating stagger truss in diaphragms. Overall, this paper provides a thorough evaluation of the proposed approach's effectiveness in enhancing the distortional frame rigidity of off-rail box girder bridges for cranes. The findings offer valuable insights into the design and reinforcement of diaphragms using staggered truss to enhance the structural performance of crane girders.

Keywords

Acknowledgement

This work is supported by National Natural Science Foundation of China (NSFC) (Grand number: 51978013), China Scholarship Council (Grand number: 201906545013), China Postdoctoral Science Foundation (Grand number: 2017M620789) and Beijing University of Technology (Grand number: 004000514118567, 004000514119060).

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