Abstract
Evaluating the seismic damage of urban road infrastructure systems is of vital importance in reducing the earthquake hazard risk of cities. Urban road infrastructure systems are commonly represented as a spatial network that covers the whole city, and in its seismic damage analysis the spatial variation of earthquake ground motions cannot be ignored. However, the effect of the spatial variation of ground motions on the seismic vulnerability of urban road networks is unknown. In this article, based on the case study on Datong, China, it is shown that the spatially variation of ground motions may increase the damage risk of urban road networks and should be considered in the seismic vulnerability analysis. This was achieved by developing a method to evaluate the performance of a post-earthquake road network considering the structural damage of road components and the building environment. This work is anticipated to be a starting point for more sophisticated studies on the earthquake risk analysis of spatially extended urban lifeline systems.
Highlights
The spatial variation of seismic ground motions cannot be ignored in the vulnerability evaluation of urban road networks
For generating spatially variable seismic ground motions, the evolutionary power spectral density (EPSD) model proposed by Wang et al [28] and the coherency function model proposed by Wang et al [29] are used in the spectral representation method
This article developed a method to evaluate the seismic vulnerability of the urban road network and analyzed the effect of the spatial variation of seismic ground motions
Summary
Extreme earthquakes may cause serious economic losses and causalities in cities. Earthquake experience indicates that the damage of urban road infrastructure will reduce the efficiency of the emergency rescue and relief material transportation after large earthquakes [1–3]. The spatial variation of seismic ground motions cannot be ignored in the vulnerability evaluation of urban road networks. The effect of the spatial variation of ground motion on the damage state of post-earthquake road networks is still unknown. Based on the case study on Datong, China, this article focuses on how the spatial variation of seismic ground motions affects the vulnerability of urban road networks. Because of the large span of an urban road network, the spatial variation of seismic ground motions must be considered for engineering purposes. The criterion to distinguish the extensive and complete damage states is whether there is a large piece in the post-earthquake road network. The post-earthquake road network is in the complete damage state
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