## Journal of Central South University

 第46卷    第7期    总第251期    2015年7月

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(兰州交通大学 土木工程学院，甘肃 兰州，730070)

Torsional geometrical properties of box section with inclined webs

School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Abstract:According to the calculation procedure for the geometrical properties in the restrained torsion theory of thin-walled box girders, the practical formulas for the twist centre, principal sector coordinate and principal sector moment of inertia of a double-cell box section with inclined webs were derived. Numerical examples validated the correctness of the formulas. Based on the practical formulas derived, the influences of the variations of the web-inclined angle, cantilever plate width and beam depth on the twist centre, principal sector coordinate and principal sector moment of inertia of the double-cell box section with inclined webs were numerically analyzed in detail. The results show that the distance from the twist centre to the middle surface of the top plate increases with the increase of the web-inclined angle; however, the ratio of the distance to the beam depth decreases with the increase of the beam depth. The principal sector coordinate at the tip end of the cantilever plate increases significantly with the increase of the cantilever plate width. The principal sector moment of inertia increases firstly and then decreases with the increase of the web-inclined angle. The principal sector moment of inertia increases rapidly with the increase of the cantilever plate width when the plate width is relatively large; moreover, the increase degree is especially significant for relative large beam depth.

Key words: box section with inclined webs; geometrical properties; twist centre; principal sector coordinate; principal sector moment of inertia

 中南大学学报（自然科学版） ISSN 1672-7207 CN 43-1426/NZDXZAC 中南大学学报（英文版） ISSN 2095-2899 CN 43-1516/TBJCSTFT