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| The finite segment method study of steel-concrete composite box beams |
| Received:February 15, 2012 Revised:September 16, 2012 |
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| DOI：10.7511/jslx201302014 |
| KeyWord:steel-concrete composite box beam shear lag effect shear deformation slip finite segment method |
| Author | Institution |
| 周旺保 |
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 ;中南大学 高速铁路建造技术国家工程实验室,长沙 |
| 余志武 |
中南大学 土木工程学院,长沙 ;中南大学 高速铁路建造技术国家工程实验室,长沙 |
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| Abstract: |
| The interface slip of composite beam would reduce the stiffness and increase the deformation,which affects the component performance.The transverse distribution of the bending normal stress presents curve shape because of uneven transverse distribution of shear stress,i.e.shear lag effect.Because the composite beam with small span-depth ratio is often overloaded,the shear deformation cannot be ignored.According to the virtual work principle,the unit stiffness matrix and equivalent nodal force vector of the composite beam were established in consideration of the slip effect,shear lag effect and shear deformation.On the basis of the unit stiffness matrix mentioned in this paper,the Finite Segment Method program of composite box beam was performed.The stress of concrete roof and steel beam floor,mid-span deflection and slip of beam-end were calculated based on this program.And the calculated results were compared with calculating results of analytic-method and experimental results.The results show that the calculating results in this paper are in good agreement with the experimental results and the results of analytical-method,and it has good stability.The correctness of the calculation in this paper is verified.The unit stiffness matrix considering the influence of shear deformation,shear lag and slip accords with engineering practice,which provides a theoretical basis for using finite beam segment method to further study of the composite box beams. |
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