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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 土木工程系主任
性别:男
毕业院校:同济大学
学位:博士
所在单位:土木工程系
学科:桥梁与隧道工程. 防灾减灾工程及防护工程. 流体力学
办公地点:桥隧研发基地306
电子邮箱:fuyouxu@dlut.edu.cn
Free vibration numerical simulation technique for extracting flutter derivatives of bridge decks
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论文类型:期刊论文
发表时间:2017-11-01
发表刊物:JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
收录刊物:Scopus、SCIE、EI
卷号:170
页面范围:226-237
ISSN号:0167-6105
关键字:Flutter derivatives; Free vibration; Numerical simulation; Bridge aerodynamics
摘要:A numerical simulation technique based on computational fluid dynamics (CFD) for determining the time-varying histories of free vibration displacements, velocities, and aerodynamic forces of bridge decks is presented. The weak coupling method is used to address the problem of fluid-structure-interaction (FSI). The flutter derivatives can be conveniently extracted using the numerically simulated displacements, velocities, and aerodynamic forces, which is similar to the procedure adopted in the forced vibration method. First, the identification accuracy of flutter derivatives is validated by comparison with the theoretical results for an ideal thin plate. Then, the flutter derivatives of two typical bridge deck sections, one streamlined and one bluff, are extracted by the proposed method. The results of the streamlined section show good agreement with other methods. However, for the bluff section, noticeable discrepancies exist between different methods. The mean angle of incidence in the free vibration method is shown to be responsible for these disagreements. The strengths of the newly-proposed approach are compared with those of the numerical and experimental forced vibration and experimental free vibration methods. This convenient and effective approach may serve as a building block for extracting flutter derivatives and better understanding of the aeroelastic responses of long-span flexible bridges.