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金门桥的动态特性,诸如固有频率,振型以及阻尼比等,都因利用环境振动数据而得到确定.这种环境振动试验,包括主塔(圣弗朗西斯科侧)的纵向和横向同时测量;测量是在塔的不同高度上,分10个站进行的.由于对运动敏感的加速度计的特殊运用,以及用记录数字相加减的方法保持和提高了桥塔纵向,扭转及横向振型的清晰度、从而得到了良好的振型识别.总共认别了塔的46个频率和位移的振型:20个纵向的,15个扭转的和11个横向的全都在0—5.0Hz的频率范围内。最后,把以前用二维和三维计算得到的振型和频率与实验结果进行了比较,表明它们却能很好地吻合,从而证实了实验测定的准确性和计算方法的可靠性.
The dynamic characteristics of the Golden Gate Bridge, such as natural frequency, mode shape and damping ratio, are determined by the use of environmental vibration data, including the simultaneous longitudinal and transverse measurements of the main tower (San Francisco side) Is carried out on 10 different stations at different altitudes of the tower and due to the special use of accelerometers that are sensitive to motion and the addition and subtraction of recorded figures to maintain and enhance the clarity of the tower longitudinal, torsional and transverse modes , Resulting in good pattern recognition. A total of 46 tower modes and displacements were identified: 20 longitudinal, 15 twisted and 11 lateral all in the 0-5.0 Hz frequency range . Finally, comparing the former two-dimensional and three-dimensional vibration modes and frequencies with the experimental results shows that they are in good agreement, confirming the accuracy of the experimental determination and the reliability of the calculation method.