桥梁抗震随机响应分析及输入功率谱研究

基于抗震设计规范地面加速度反应谱曲线,生成当量的地面加速度功率谱曲线.比较了用迭代修正方法和Kaul方法生成当量功率谱曲线的效果,并对Kaul方法中基于经验的概率参数进行了修正.针对我国规范所适用的所有地区进行了系统对比,并借助于虚拟激励法对多座实际桥梁按均匀地面运动和考虑行波效应分别进行了计算比较.大量数值计算和对比研究表明,Kaul方法在按所提建议修正参数之后,精度已经比较满意,同时保持了使用简便的优点,适用于实际桥梁的随机抗震分析.

Seismic random vibration analysis of bridges and production of input power spectrum

The equivalent power spectral densi response spectral curves prescribed by earthqu ty ak compared with those by the iteration scheme and probabilistic parameter in the Kaul method is curves are transformed from the ground acceleration e resistant the Kaul proposed. codes. The qualities of these curves are method. In addition, a modification of a A great deal of seismic responses of single-degree-of-freedom systems with different fundamental frequencies are investi compared for all kinds of soil conditions stipulated by different earthquake resistant codes. results are presented for the seismic ground motions as well as ground response analysis of some practical bridges subjected motions considering the wave passage effect by usi excitation method. These results show that the precision of the Kaul method by m gated and Numerical to uniform ng pseudo odifying a probabilistic parameter is remarkably improved. However, its use is still convenient and applicable to the seismic response analysis of practical bridges.