桥梁断面气动导纳互谱识别方法注记

现存的各种气动导纳函数识别方法,为了便于求解忽略了脉动风速互谱的作用,且假定脉动风水平和竖向分量对抖振力导纳函数分量作用等效,识别过程缺少对算法系统和试验采样误差影响的标定,导纳函数识别结果缺少验证等诸多不足。针对上述问题,采用改进的互谱导纳识别方法,考虑了多种影响因素的共同作用,详细标定了算法系统和试验测量误差的影响,基于测量稳定性和精度较高的节段模型高频天平测力方法识别了流线型箱梁桥梁节段Scanlan抖振气动力全部六个导纳函数分量。

Footnote about correlation spectrum identification method for aerodynamic admittance of a bridge girder cross-section

In order to simplify identification algorithm about aerodynamic admittance function of a typical bridge section, some assumptions were usually adopted, such as, ignoring correlation spectrum component about stochastic wind wave, assuming equivalence about vertical- and horizontal- spectrum components between stochastic wind wave and buffeting force history, and neglecting precision evaluation about identification algorithm system and testing sampling process.For the above shortcomings, the so-called "modified correlation spectrum identification method" was proposed, it could synchronously consider multi-component effects between stochastic wind components and buffeting forces, and its precision and effectiveness were also validated with the help of numerical simulation.Finally, using the high-frequency force-measured balance in wind tunnel tests, multi-component admittance functions of a streamline box-girder cross-section bridge model were identified.