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| The delicate analysis of shear lag effect on trapezoidal box girders |
| Received:July 02, 2012 Revised:December 01, 2012 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201403012 |
| KeyWord:bridge engineering shear lag effect self-equilibrium condition energy-variation principle trapezoidal box girder |
| Author | Institution |
| 甘亚南 |
盐城工学院 土木工程学院, 盐城 |
| 石飞停 |
盐城工学院 土木工程学院, 盐城 |
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| Abstract: |
| In consideration of self-equilibrium condition for shear lag warping stress,shear deformation and shear lag effect,three different longitudinal displacement difference functions are employed to accurately reflect the amplitude of change of shear lag in the trapezoidal box girders with various widths of wing slabs,and a new warping displacement mode of trapezoidal thin-walled box girders is chosen to meet the axial self-equilibrium condition for corresponding stress,a more accurate approach is proposed to analyze the mechanical characteristics of trapezoidal box girders generally used in engineering.Based on the minimum potential principle,the governing differential equations and related natural boundary conditions are induced,the closed-form solutions of generalized displacements are obtained.The variations of stress of trapezoidal box girders,caused by the change of factors such as self-equilibrium condition,type of loading and ratio of span and width are discussed,the importance about the introduction of self-equilibrium condition is proved. |
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