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Time domain buffeting analysis of long suspension bridges under skew winds

机译:斜风作用下长悬索桥的时域抖振分析

摘要

This paper presents a time domain approach for predicting buffeting response of long suspension bridges under skew winds. The buffeting forces on an oblique strip of the bridge deck in the mean wind direction are derived in terms of aerodynamic coefficients measured under skew winds and equivalent fluctuating wind velocities with aerodynamic impulse functions included. The time histories of equivalent fluctuating wind velocities and then buffeting forces along the bridge deck are simulated using the spectral representation method based on the Gaussian distribution assumption. The self-excited forces on an oblique strip of the bridge deck are represented by the convolution integrals involving aerodynamic impulse functions and structural motions. The aerodynamic impulse functions of self-excited forces are derived from experimentally measured flutter derivatives under skew winds using rational function approximations. The governing equation of motion of a long suspension bridge under skew winds is established using the finite element method and solved using the Newmark numerical method. The proposed time domain approach is finally applied to the Tsing Ma suspension bridge in Hong Kong. The computed buffeting responses of the bridge under skew winds during Typhoon Sam are compared with those obtained from the frequency domain approach and the field measurement. The comparisons are found satisfactory for the bridge response in the main span.
机译:本文提出了一种时域方法来预测偏风作用下长悬索桥的抖振响应。根据在偏风下测得的空气动力学系数和包括空气动力学脉冲功能的等效脉动风速,得出在平均风向上桥面板倾斜带上的抖振力。使用基于高斯分布假设的频谱表示方法,模拟等效波动风速以及沿桥面板的抖振力的时程。桥面倾斜带上的自激力由涉及空气动力脉冲功能和结构运动的卷积积分表示。自激力的空气动力学脉冲函数是使用有理函数逼近从偏风条件下通过实验测量的颤振导数得出的。采用有限元方法建立了斜吊作用下长悬索桥的运动控制方程,并采用Newmark数值方法求解。拟议的时域方法最终应用于香港的青马悬索桥。将台风山姆期间斜风作用下桥梁的计算抖振响应与从频域方法和现场测量获得的抖振响应进行比较。发现这些比较对于主跨中的桥梁响应是令人满意的。

著录项

  • 作者

    Liu G; Xu YL; Zhu LD;

  • 作者单位
  • 年度 2004
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

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