Research on the seismic damage pattern of the CRTS II track-continuous beam bridge system considering the influence of vertical seismic components

This paper takes the typical CRTS Ⅱ track-continuous beam bridge system as the object and establishes a reasonable numerical calculation model based on OpenSees. Then meticulously analyzes the distribution patterns of damage to key components in the CRTS Ⅱ track-continuous beam bridge system under different intensities of near-fault earthquakes. By conducting statistical analysis on the response errors of different components under corresponding vertical seismic components, the influence degree of vertical seismic components was quantified based on probability distribution, and it was further refined to the component level. Finally, the linear fitting method was used to describe the variation pattern of the response errors of each component in the CRTS Ⅱ track-continuous beam bridge system under different earthquake types, different earthquake intensities, and different directions with respect to the vertical seismic components, and the fitting effect was good. Based on the research content of this paper, it is possible to simplify the seismic input of the CRTS Ⅱ track-continuous beam bridge system while ensuring that the response results of the key components have corresponding credibility. This provides valuable reference data for improving the speed and accuracy of the seismic damage analysis of the system.