Probabilistic seismic performance assessment of urban traffic network incorporating micro inter-connection model of interchanges

Interchanges serve as vital hubs in urban traffic networks. Conventional network topology models typically simplify interchanges as single nodes, thus ignoring their actual configurations and internal functional connections, making it difficult to accurately assess the impact of seismic damage on the traffic capacity of interchanges. This limitation has become a key factor restricting the accuracy of seismic performance assessments of post-earthquake traffic networks. This paper proposes a seismic performance assessment method for urban traffic networks, which integrates the functional interdependence of interchange components and accounts for the correlation of their seismic damages. Firstly, to analyse the seismic damage of interchange more accurately, the micro inter-connection model is established for the interchange based on actual spatial layout and functional relationships, and the copula function is employed to account for the correlation of interchanges’ seismic damage. Secondly, a probabilistic assessment of post-earthquake functionality of the urban traffic network and the links’ importance is conducted by employing the Monte Carlo method. Finally, seismic performance assessment of traffic network incorporating micro inter-connection model of interchanges was conducted and compared with the analysis results of traditional network topology models to illustrate the effectiveness of the proposed method.