Abstract
Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations
Highlights
Many high-pier railway bridges have been constructed in Chinese southwestern regions due to rapid economic development and the area’s mountainous site topography [1]
According to statistics on Chinese high-pier railway bridges, around 90 % of these bridges are in the west of China, and approximately 40 % of them have piers higher than 40 m
Almost all high-pier railway bridges built in maintainous area, such as the span lengths and pier heights, are beyond the range of seismic design codes [4]
Summary
Many high-pier railway bridges have been constructed in Chinese southwestern regions due to rapid economic development and the area’s mountainous site topography [1]. Jia presented a theoretical non-stationary stochastic analysis scheme that uses the pseudo-excitation method (PEM) for the seismic analysis of long-span structures under tri-directional spatially varying ground motions, based on the local site effects on structural seismic response, which were studied in regard to a high-pier railway bridge. (4) ÷ (10), the power spectral density matrix of the tri-directional spatially varying ground motions in Eq (3) can be constructed, which will be used to compute the input pseudoforces in the stochastic seismic analysis of structures using PEM. The power spectral density matrix S0(iw,t) of the tri-directional non-stationary spatially varying ground motions can be decomposed as:. To investigate the response of high-pier railway bridges under tri-directional stationary and non-stationary spatially varying ground motions, a long span, high-pier, continuous rigid frame bridge has been employed in this paper. Case 9 and case 12, which are considered to be fully coherent, are equivalent to case 1 and case 4
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