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| Modified analysis method on mechanical properties of rectangular box girders |
| Received:August 18, 2021 Revised:December 09, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210818001 |
| KeyWord:self-equilibrium conditions shear lag effect vertical bending rectangular box girders modified analysis method |
| Author | Institution |
| 岑峰 |
南京航空航天大学 土木系, 南京 |
| 甘亚南 |
盐城工学院 土木工程学院, 盐城 |
| 尹明干 |
盐城工学院 土木工程学院, 盐城 |
| 高培伟 |
南京航空航天大学 土木系, 南京 |
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| Abstract: |
| Firstly, different shear lag warping displacement functions are set for a rectangular box girder, then factors such as shear lag effect, shear deformation, self-equilibrium conditions for shear lag warping stress and moment are considered.Based on the energy-variation principle, the differential equations and natural boundary conditions of the rectangular box girder are established, and the existing analytical method of thin-walled structures is modified.Compared with the traditional shear lag theory, a deeper understanding of the mechanical properties of the rectangular box girder is obtained.This research shows that:(1) Due to the introduction of self-equilibrium conditions, the mechanical properties of the box girders can be decomposed into independent elementary beam theory and shear lag theory.Therefore, the mechanical properties of the rectangular box girder are represented by the superposition of two theories. (2) After the section size of the box girder is determined, the shear lag effect on the normal stress remains unchanged, the vertical mechanical behavior of shear lag effect is independent of the span of the box girder. (3) Although the height of rectangular box girder has some influence on the shear warping stress of the box girder and the theoretical stress value of an elementary beam, its shear lag coefficient remains unchanged;so the shear lag effect is independent of the height of the rectangular box girder.(4) The shear lag effect not only affects the mechanical properties of the box girder's flanges, but also can not be ignored on the mechanical properties of the box girder's webs.Therefore, the modified method in this paper not only improves the calculation accuracy significantly, but also better reflects the mechanical characteristics of the rectangular box girder. |
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