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논문 기본 정보

자료유형
학술저널
저자정보
Guo, Junfeng (School of Civil Engineering, Southwest Jiaotong University) Zheng, Shixiong (School of Civil Engineering, Southwest Jiaotong University) Zhu, Jinbo (School of Civil Engineering, Southwest Jiaotong University) Tang, Yu (School of Civil Engineering and Architecture, Southwest Petroleum University) Hong, Chengjing (School of Civil Engineering, Southwest Jiaotong University)
저널정보
테크노프레스 Wind & structures Wind & structures 제25권 제4호
발행연도
2017.1
수록면
343 - 360 (18page)

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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, "little 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.

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