【摘要】 采用ANSYS软件分析天津西站Ⅱ区的结构特征,在传统随机振动算法中引入位移反应谱,结合水平向和竖向互功率谱表达形式的合理修正方法、沿结构整体坐标系方向功率谱、位移反应谱和传统三维平稳随机振动计算方法,提出用于高速铁路车站抗震计算的多维反应谱组合方法,并将多维反应谱组合方法的计算结果与时程响应分析和规范算法的计算结果进行比较。结果表明:高速铁路车站结构的异向振型间的相关性较强,地震动输入角度对结构响应的影响显著,而规范算法忽略了异向地震激励的相关性,不能反映地震动输入角度对结构响应的影响;多维反应谱组合法由于合理考虑了异向地震激励输入角度的变化、异向振型和地震激励的相关性,因此其计算结果与时程响应分析的结果吻合,更适用于高速铁路车站的抗震计算。更多还原

【Abstract】 The structural characteristics of the second section of Tianjin West Railway Station were analyzed using ANSYS software and the displacement response spectrum was introduced into the traditional random vibration algorithm.The combination method of multidimensional response spectrum was deduced based on the rational modified expression of cross power spectrum between horizontal and vertical directions,the matrix of power spectrum along structural coordinates,displacement response spectrum and the traditional three-dimensional stationary random vibration calculation method.The comparisons of structural response obtained from the combination method,the time-history analysis method and the code method were conducted.The results showed that strong correlation existed in the vibration modes with different directions of high speed railway station structures.The influence of the seismic input angle on structural response was significant.But the code method neglected the correlation of the seismic excitations with different directions and could not reflect the influence of seismic input angle on structural response.The result obtained from the combination method of multidimensional response spectrum agreed well with that from time-history analysis method and the combination method was more suitable for the seismic calculation of high speed railway station for reasonably considering the changes of seismic input angle of the seismic excitations with different directions as well as the correlation of the vibration modes with different directions and seismic excitations.更多还原