Journal of Natural Disaster Science

RESTORATION PROCESS OF MALFUNCTION OF A ROAD TRANSPORTATION SYSTEM AFTER SEISMIC DISASTER

Yoshikazu YAMADA
Professor, Department of Civil Engineering, Kyoto University, Kyoto
Shigeru NODA
Associate Professor, Department of Social Systems Engineering, Tottori University, Tottori
and
Akira IGARASHI
Graduate Student, Scripps Institution of Oceanography, University of California at San Diego, California

(Received 16 September 1992 and in revised form 23 February 1993)

Abstract

A Monte Carlo simulation method is proposed which can evaluate the post-earthquake restoration process for a road transportation system. The simulation model has three phases: 1) the assessment of the damaged state of the network; 2) the performance evaluation of the system including traffic flow analysis; and 3) the recovery process. The restoration problem is divided in two parts; emergency repairs evaluated by considering only the connectivity between nodes and repair work affected by traffic control. Structural and functional restorations are represented by various useful measures. The method has been used to the road transportation system in the Izu Peninsula during a post-earthquake period. The structural and functional restoration processes, restoration order, and traffic volume, as affected by repair progress, are examined within the context of such constraints as available manpower and materials. An optimum strategy for system restoration is discussed quantitatively.

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