论文部分内容阅读
应用随机振动理论来分析悬索桥由于相关与不相关的多点激励所引起的竖向地震响应。以实际地面位移记录的有限傅里叶(Fourier)变换作为描述该结构相应的地面运动的基本输入数据。这些记录所在位置之间的距离与该结构相当。借助于这些傅氏变换以进行多点激励的谱相关分析。在研究由于地震引起的悬索桥竖向运动时、需要考虑该桥的纵向地面激励的影响。举一实例以表明一个实际(位于地震活动区的)桥梁对在支承处不同特性的地震地面运动作用的响应的研究。通过分析可以看出,在总响应中有较高阶振型的参与是正确估计这种结构的地震响应特性所必需的。并且可以观察到相关的多点激励的响应值与不相关情况下得到的响应值具有明显的区别。
Stochastic vibration theory is applied to analyze the vertical seismic response of suspension bridges due to the correlation and non-correlation of multi-point excitation. The finite Fourier transform recorded with the actual ground displacement is used as the basic input data describing the corresponding ground motion of the structure. The distance between these records is comparable to the structure. With these Fourier transforms, spectral correlation analysis of multi-point excitation is performed. In studying the vertical motion of suspension bridge caused by earthquake, the influence of longitudinal ground excitation of the bridge needs to be considered. An example is given to show the study of the response of an actual (located in a seismic activity zone) bridge to the seismic ground motion of different characteristics at the bearing. It can be seen from the analysis that the participation of higher-order modes in the total response is necessary to correctly estimate the seismic response of this structure. And it can be observed that there is a clear difference between the response values of the related multi-point stimuli and the response values obtained under the unrelated conditions.