Structural Engineering and Mechanics

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Torsion strength of single-box multi-cell concrete box girder subjected to combined action of shear and torsion

  • Wang, Qian (Faculty of Infrastructure Engineering, Bridge Science Research Institute, Dalian University of Technology) ;
  • Qiu, Wenliang (Faculty of Infrastructure Engineering, Bridge Science Research Institute, Dalian University of Technology) ;
  • Zhang, Zhe (Faculty of Infrastructure Engineering, Bridge Science Research Institute, Dalian University of Technology)
  • Received : 2015.01.26
  • Accepted : 2015.06.22
  • Published : 2015.09.10
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Abstract

A model has been proposed that can predict the ultimate torsional strength of single-box multi-cell reinforced concrete box girder under combined loading of bending, shear and torsion. Compared with the single-cell box girder, this model takes the influence of inner webs on the distribution of shear flow into account. According to the softening truss theory and thin walled tube theory, a failure criterion is presented and a ultimate torsional strength calculating procedure is established for single-box multi-cell reinforced concrete box girder under combined actions, which considers the effect of tensile stress among the concrete cracks, Mohr stress compatibility and the softened constitutive law of concrete. In this paper the computer program is also compiled to speed up the calculation. The model has been validated by comparing the predicted and experimental members loaded under torsion combined with different ratios of bending and shear. The theoretical torsional strength was in good agreement with the experimental results.

Keywords

Acknowledgement

Supported by : Liaoning Education Department of China, National Natural Science Foundation of China

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