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| Analysis on torsion effect of concrete composite box girder with steel truss webs |
| Received:June 09, 2020 Revised:August 24, 2020 |
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| DOI：10.7511/jslx20200609002 |
| KeyWord:composite box girder steel truss web torsion effect differential equation finite element simulation |
| Author | Institution |
| 杨霞林 |
兰州交通大学 土木工程学院, 兰州 |
| 于小芹 |
山东省建筑工程质量检验检测中心有限公司, 济南 |
| 张元海 |
兰州交通大学 土木工程学院, 兰州 |
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| Abstract: |
| Combined with the structural characteristics of a steel truss web concrete composite box girder,based on the torsion theory of thin-walled box girders,the expressions of the torsional warping stress of the concrete top and bottom plates of the closed section of the composite box girder and the converted steel webs are derived,and then the restrained torsion control differential equation of the composite box girder is derived;the initial parameter method is used to solve the differential equation,and the variation law of warping double moment and normal stress with span is analyzed.Through the finite element simulation analysis,the finite element value is compared with the theoretical value,and the results are in good agreement.The results show that the warping double moment reaches the maximum value at the action of concentrated torque,and the decay speed is very fast,which makes the warping stress of the box girder section reach the maximum value.The warping double moment of the box girder is almost zero at the position far away from the action of concentrated torque,and the warping normal stress is almost zero.The relative error between the finite element value and the theoretical value is less than 10%,which shows that the theoretical calculation method established in this paper is reasonable and feasible. |
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