Earthquake disaster simulation of regional bridges based on nonlinear dynamic time history response analysis

Abstract As the hub of the traffic network, the rapid assessment of the damaged state of bridges after earthquakes is of great significance for post-disaster rescue. The traditional vulnerability-based method can only provide the probability of different damage states of structures under different earthquake intensity indicators, which confuses the selection of post-disaster rescue routes. Therefore, based on nonlinear dynamic time history response analysis, this paper proposes a technology for earthquake disaster simulation of regional bridge groups and rapid assessment of post-earthquake damage state. First, the surface seismic response is calculated based on the regional geological borehole data obtained from the previous investigation; Second, the simplified computational mechanical model of the regional girder bridge is extracted to achieve standardized and modular data input and response analysis; Finally, the damaged state of the bridge is evaluated quantitatively based on the selected component damage index. Eighty-five bridges in a specific area are considered an example to verify the proposed method. The results show that the proposed method has high calculation efficiency and can consider the site characteristics and structural design parameters. Also, the calculation results can better reflect the actual earthquake damage distribution, providing strong technical support for post-disaster rescue.