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| The distortional buckling calculation formula of the steel-concrete composite beams in the negative moment region |
| Received:December 14, 2010 Revised:June 17, 2011 |
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| DOI：10.7511/jslx20123026 |
| KeyWord:steel-concrete composite beams distortional buckling rotational restraint stiffness lateral restraint stiffness critical moment negative moment |
| 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 ;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 ;高速铁路建造技术国家工程实验室, 长沙 |
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| Abstract: |
| Lateral bending buckling and lateral flexural-torsional buckling are both important buckling modes for steel-concrete composite beams in the negative moment region,and only the lateral bending buckling is considered in the existing computing method,so there is some limitations.Based on the rotational restraint stiffness and lateral restraint stiffness calculation formulas provided by the steel beam web plate to the lower cloud point flange and the thin-walled bar buckling theory in elastic medium,the calculation formulas of the lateral bending and lateral flexural-torsional buckling moment of the steel-concrete composite beams in the negative moment are derived.The example analysis shows that the existing computing methods all have some theory shortcomings,and the computing method of this paper is more reasonable.At the same time,the calculation formula of this paper is more concise than the calculation formulas of the same type,easy to be applied,so it is suitable for engineering application. |
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