“房桥合一”铁路客站抗震计算的快速高效多维虚拟激励法
Fast and Efficient Multi-Dimensional Pseudo-Excitation Method for Seismic Calculation of “Building-Bridge Integration” Railway Station

针对"房桥合一"铁路客站节点数多、空间相互作用显著等特点，利用沿结构整体坐标系方向功率谱的表达式和合理谱强度因子的确定方法，提出能合理考虑地震激励输入角度变化的快速多维虚拟激励法，并以天津西站Ⅱ区作为工程案例，对利用快速多维虚拟激励法、时程响应分析法和已有虚拟激励法的计算结果进行比较。结果表明：三种算法的计算结果吻合较好，证明快速多维虚拟激励法的计算值是合理的；且与已有虚拟激励法相比，快速多维虚拟激励法的计算效率显著提高，更适合于"房桥合一"铁路客站的抗震计算。
A building-bridge integration railway station features many nodes with obvious spatial interactions; therefore, any calculation method used to calculate seismic responses for this type of station needs to have a high computing efficiency. In addition, it needs to enable consideration of the correlation between modal shapes, seismic excitation, and variations in the input angle of seismic excitation. In this study, based on power spectrum formulas along the direction of the structural global coordinate system and the determination method of the rational spectral intensity factor, this study proposes a fast and efficient multi-dimensional pseudo-excitation method that calculates seismic responses of the building-bridge integration railway system and considers variations in the seismic excitation angle. Using Region-Ⅱ of Tianjin West Railway Station as an example, calculated results of the structural response obtained from our proposed method are compared with those using the time-history analysis method and the existing pseudo-excitation method. Results are in good agreement with each other and show that the fast, multi-dimensional, pseudo-excitation method is rational, and its computational efficiency is significantly improved compared with the existing pseudo-excitation method. Therefore, the method is considered to be more suitable than others for making seismic calculations of a building-bridge integration railway station under earthquake excitation.