EFFECT OF DAMAGE TO BRIDGES UNDER SEISMIC AND TSUNAMI HAZARDS ON PROBABILISTIC CONNECTIVITY OF ROAD NETWORK

Abstract

 This paper presents a methodology for estimating a connectivity of road network considering the vulnerability of bridges under seismic and tsunami hazards. With the aid of a geographic information system and graph theory, the deterioration of the bridge network’s connectivity can be easily estimated based on seismic and tsunami hazard assessments, and structural fragility estimation. Both uncertainties associated with fault movement estimations, spatial distribution of hazard intensities and structural vulnerability, and damage correlation among bridges are considered when estimating the probabilistic connectivity in Monte Carlo simulation. In an illustrative example, the bridge network affected by the anticipated Nankai Trough earthquake is analysed. Computational results demonstrate that the connectivity depends highly on spatial distribution of hazard intensities and the correlation among damage states of bridges.