Abstract: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.
