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Wind and Structures Volume 25, Number 4, October 2017 , pages 343-360 DOI: https://doi.org/10.12989/was.2017.25.4.343 |
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Study on post-flutter state of streamlined steel box girder based on 2 DOF coupling flutter theory |
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Junfeng Guo, Shixiong Zheng, Jinbo Zhu, Yu Tang and Chengjing Hong
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| Abstract | ||
| The post-flutter state of streamlined steel box girder is studied in this paper. Firstly, the nonlinear aerodynamic self-excited forces of the bridge deck cross section were investigated by CFD dynamic mesh technique and then the nonlinear flutter derivatives were identified on this basis. Secondly, based on the 2-degree-of-freedom (DOF) coupling flutter theory, the torsional amplitude and the nonlinear flutter derivatives were introduced into the traditional direct flutter calculation method, and the original program was improved to the \"post-flutter state analysis program\" so that it can predict not only the critical flutter velocity but also the movement of the girder in the post-flutter state. Finally, wind tunnel tests were set to verify the method proposed in this paper. The results show that the effect of vertical amplitude on the nonlinear flutter derivatives is negligible, but the torsional amplitude is not; with the increase of wind speed, the post-flutter state of streamlined steel box girder includes four stages, namely, \"ittle amplitude zone\", \"step amplitude zone\", \"linearly growing amplitude zone\" and \"divergence zone\"; damping ratio has limited effect on the critical flutter velocity and the steady state response in the post-flutter state; after flutter occurs, the vibration form is a single frequency vibration coupled with torsional and vertical DOF. | ||
| Key Words | ||
| streamlined steel box girder; post-flutter state; soft flutter; CFD; wind tunnel tests | ||
| Address | ||
| Junfeng Guo, Shixiong Zheng, Jinbo Zhu and Chengjing Hong: School of Civil Engineering, Southwest Jiaotong University, Chengdu, China, 610031 Yu Tang: chool of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu, China, 610500 | ||