Connectivity Reliability of Regional Highway Network Considering Spatial Variation in Seismic Ground Motion
Regional highway network serves as the primary artery of social transportation and the life-line for earthquake disaster rescue.Connectivity reliability reflects the traffic capacity of the highway network following seismic hazards.Ground motions exhibit significant spatial variation influenced by the source location and epicentral distance,which have a crucial impact on the post-earthquake dam-age status of highway network.This study adopted the highway network in Handan area,to investi-gate the connectivity reliability under the influence of spatial variation in ground motions by setting seismic source locations and magnitudes.First,the 1830 Cixian earthquake and a virtual earthquake in Handan City were taken as earthquake scenarios,with the magnitudes of M6.0,6.5,7.0 and 7.5,re-spectively.The spatial variation of ground motions was expressed based on attenuation relationships to obtain the Peak Ground Acceleration(PGA)corresponding to highway units.Then,the post-earth-quake traffic probabilities of highway units were analyzed in conjunction with the seismic vulnerability models.Finally,considering the typical characteristics of the wide spatial scale of the regional high-way network,an optimization of the maximum possible state algorithm used for urban roads was con-ducted to evaluate the connectivity reliability of the highway network in Handan area.The results dem-onstrate that the regional highway network contains a huge number of units and nodes with a complex spatial distribution.Additionally,the seismic connectivity reliability is closely related to existing road distributions and regional urban locations.The spatial variation of ground motions significantly influ-ences the post-earthquake damage status and traffic probabilities of highway units.In conclusion,the research findings provide references for seismic disaster evaluation and resilience analysis of regional highway network.
regional highway networkconnectivity reliabilityspatial variation in seismic ground mo-tionpost-earthquake traffic probability