In recent decades, the construction of the China HSR has been experiencing a golden period since the approbation of a series of national plans. It becomes a prior alternative to construct high-speed railways (HSRs) to satisfy the strong mobility of both people and goods in modern societies. Social and economic development requires faster and safer transportation systems. Ignoring the frequency non-stationarity of the earthquake may underestimate the quasi-static displacement caused by the surface waves. The proposed POD-based method works well in estimating the structural quasi-static displacement. The results show that the structural nodal displacements estimated by the PEM agree well with those obtained by the MCS method. A comparative study on the stochastic seismic response of the bridge is conducted using both the fully and modulated non-stationary ground acceleration. A framework is proposed to determine the pseudo static displacement for the PEM under fully non-stationary seismic excitation, using the proper orthogonal decomposition (POD).
The stochastic seismic analysis of the large-span CGHSR bridge under a tri-directional earthquake, taking into consideration the wave passage effect, is performed using the pseudo excitation method (PEM) in frequency domain and the Monte Carlo sampling (MCS) method in time domain. The stochastic ground motion is determined by a fully non-stationary ground acceleration model with both the time-varying intensity and frequency content. The main objective of the present work is to evaluate the stochastic seismic response of a large-span continuous girder high-speed railway (CGHSR) bridge subjected to fully non-stationary seismic excitation.
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