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| Analysis of free vibration characteristic of thin-wall box-girder considering shear lag and shear deformation |
| Received:April 24, 2012 Revised:May 28, 2012 |
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| DOI：10.7511/jslx201306009 |
| KeyWord:thin-wall box-girder shear lag effect shear deformation calculus of variation characteristic of free vibration |
| Author | Institution |
| 周旺保 |
武汉理工大学 土木工程与建筑学院, 武汉 ;中南大学 土木工程学院, 长沙 |
| 蒋丽忠 |
中南大学 土木工程学院, 长沙 |
| 戚菁菁 |
中南大学 土木工程学院, 长沙 |
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| Abstract: |
| Based on energy variation principle,the differential equation of free vibration and the corresponding boundary conditions of box girder with consideration for the shear lag effect meeting self equilibrated stress,shear deformation as well as rotational inertia were induced.The ANSYS finite element solutions were compared with the analytical solutions by calculation examples and the validity of the proposed approach was verified.The obtained formulas developed the shear lag theory.Some meaningful conclusions for engineering design were obtained.The decrease extent of each order natural frequency of the box-girder beam is great under the shear lag effect.The shear lag effect of box girder increases when frequency order rises,and increases while span-width ratio decreases. |