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ZHANG Yuan-hai, LIN Li-xia. RESEARCH ON WARPING STRESS OF RESTRAINED TORSION FOR THIN-WALLED BOX GIRDER UNDER ECCENTRIC AXIAL LOAD[J]. Engineering Mechanics, 2013, 30(3): 32-36. DOI: 10.6052/j.issn.1000-4750.2011.10.0719
Citation: ZHANG Yuan-hai, LIN Li-xia. RESEARCH ON WARPING STRESS OF RESTRAINED TORSION FOR THIN-WALLED BOX GIRDER UNDER ECCENTRIC AXIAL LOAD[J]. Engineering Mechanics, 2013, 30(3): 32-36. DOI: 10.6052/j.issn.1000-4750.2011.10.0719
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RESEARCH ON WARPING STRESS OF RESTRAINED TORSION FOR THIN-WALLED BOX GIRDER UNDER ECCENTRIC AXIAL LOAD

  • (School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China)

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  • Based on the theory of restrained torsion for a thin-walled box girder, the equations of bimoment for the restrained torsion of a thin-walled box girder under an eccentric axial load are derived through taking the eccentric axial load as a kind of a bimoment load. The practical formulas for the twist centre and principal sectoral coordinate are further derived to simplify the calculation of warping stress. A box girder model is analyzed and the calculated stresses are in a good agreement with those obtained by the shell element of the finite element software ANSYS, validating the presented method and formulas. The influence of the variation of box depth-width ratios and cantilever plate widths on the warping stress for restrained torsion of a thin-walled box girder under an eccentric axial load is analyzed in detail. It is shown that: the depth-width ratio and the cantilever plate width affect remarkably the warping stress at the tip of a cantilever plate, while they have a smaller effect on the warping stress at the intersection of web and top or bottom plates; the warping stress at the control point on the fixed end cross section of the cantilever box girder under an eccentric axial load reaches 12% of that calculated by the elementary beam theory, which should not be ignored.
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