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Structural Engineering and Mechanics
  Volume 55, Number 5, September10 2015, pages 953-964

Torsion strength of single-box multi-cell concrete box girder subjected to combined action of shear and torsion
Qian Wang, Wenliang Qiu and Zhe Zhang

    A model has been proposed that can predict the ultimate torsional strength of single-box multicell 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.
Key Words
    reinforced concrete; multi-cell box girder; torsional strength; softening truss theory; failure criterion
Qian Wang, Wenliang Qiu and Zhe Zhang: Faculty of Infrastructure Engineering, Bridge Science Research Institute, Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian city, Liaoning Province, China

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