TIME DOMAIN FLUTTER AND BUFFETING RESPONSE ANALYSIS OF BRIDGES
TIME DOMAIN FLUTTER AND BUFFETING RESPONSE ANALYSIS OF BRIDGES
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DOI：
10.1061/(asce)0733-9399(2000)126:1(7
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Xinzhong Chen;M. Matsumoto;A. Kareem
中科院分区：
文献类型：
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作者：
Xinzhong Chen;M. Matsumoto;A. Kareem
提出了一种大跨度桥梁颤振抖振耦合响应的时域分析方法。与频率有关的非定常气动力由气动力脉冲函数和结构运动或风脉动的卷积积分表示。气动力脉冲函数由实验测得的颤振导数、气动力导纳函数和气动力的展向相干性用有理函数近似法导出。该方法的一个显著特点是，非定常气动力的频率相关特性以及气动力和结构源的非线性可以在响应分析中建模。采用所提出的时域方法对一座大跨度悬索桥的颤振和抖振响应进行了分析。计算结果与频域分析结果吻合较好。用于演示所提出的计划的例子集中在处理频率相关的自激和抖振力的影响。非线性效应的应用将在未来的出版物中讨论。
A time domain approach for predicting the coupled flutter and buffeting response of long span bridges is presented. The frequency dependent unsteady aerodynamic forces are represented by the convolution integrals involving the aerodynamic impulse function and structural motions or wind fluctuations. The aerodynamic impulse functions are derived from experimentally measured flutter derivatives, aerodynamic admittance functions, and spanwise coherence of aerodynamic forces using rational function approximations. A significant feature of the approach presented is that the frequency dependent characteristics of unsteady aerodynamic forces and the nonlinearities of both aerodynamic and structural origins can be modeled in the response analysis. The flutter and buffeting response of a long span suspension bridge is analyzed using the proposed time domain approach. The results show good agreement with those from the frequency domain analysis. The example used to demonstrate the proposed scheme focuses on the treatment of frequency dependent self-excited and buffeting force effects. Application to nonlinear effects will be addressed in a future publication.