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| Research on torsional geometric properties of asymmetric thin-walled box section |
| Received:January 12, 2022 Revised:May 26, 2022 |
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| DOI：10.7511/jslx20220112004 |
| KeyWord:asymmetrical box section geometrical properties of cross section twist center principal sector coordinate principal sector moment of inertia |
| Author | Institution |
| 李征豹 |
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: |
| In order to reveal the effect of the cross slope on the torsional properties of asymmetric thin-walled box section with inclined top plate,the practical formulas for calculating the twist center,principal sector coordinate and principal sector moment of inertia of cross section were derived.Based on the practical formulas,the effects of torsional geometrical properties between the inclined and horizontal top plate were compared,and the influences of the variations of the cross slope,cell height to width ratio and cantilever plate width on the torsional properties were analyzed.The research shows that the results in this paper are in good agreement with those computed by the finite element software ANSYS.When the cross slope is not considered,the lateral position of the twist center and the principal sector coordinate at the intersection of the higher web and bottom plate will be significantly affected.When the cell height to width ratio is less than 0.65,its change has a significant effect on the lateral position of the twist center.The principal sector moment of inertia decreases with the increase of the cross slope,and increases with the increase of the cantilever plate width and cell height to width ratio. |
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