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| Influence of skewly arranged inner piers on flexural-torsional behavior of continuous box girders |
| Received:October 08, 2020 Revised:January 12, 2021 |
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| DOI：10.7511/jslx20201008001 |
| KeyWord:continuous box girder skew supports skew angle secondary moment bi-moment |
| Author | Institution |
| 魏彦红 |
兰州交通大学 土木工程学院, 兰州 |
| 张元海 |
兰州交通大学 土木工程学院, 兰州 |
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| Abstract: |
| For revealing the influence of skew supports of inner piers on mechanical properties of a continuous-box-girder, the force method equation of a skewly supported continuous box girder was established by considering the coupling of constrained torsion and vertical flexure in this paper, and the analytic formula of internal force and deformation were derived.A two-span skewly supported continuous box girder was adopted as the numerical example.The internal force and deformation were calculated for the box girder subjected to vertical symmetric and eccentric uniform loads, respectively.The bending moment in the governing sections was also calculated by using ANSYS software.The results show that the bending moment calculated by the presented method is in good agreement with that calculated by ANSYS.Compared with a regular continuous box girder, the deflection of the box girder subjected to the vertical symmetric uniform load is not decreased remarkably, however, the variation of deflection of the box girder subjected to the vertical eccentric uniform load is remarkable and can get over 25% more than the deflection, when the skew angle is 45°.The twist angle of the box girder is larger than that of a regular continuous box girder and the secondary moment and bi-moment have larger values only in a small range near the skew supports, either under vertical symmetrical or under vertical eccentric uniform load. |
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