Seismic Reliability And Cost Evaluation For AHospital Lifeline Network System

This paper presents an evaluating method for seismic reliability and costs of a lifesaving lifeline connecting to a hospital during an earthquake. By using the reliability analysis method for a lifeline network based on the Monte Carlo method, reliability of a virtual model and a real one of Yatsushiro-city water supply pipeline network is evaluated. Numerical computations are performed for models with various conditions of ground and pipes. As a result, in a case of seismic intensity 5, the reliability of a pipeline connecting to a hospital near the sea side is low. In a case of seismic intensity 6, all nodes connecting to hospitals have very low reliability and this suggests that other methods of preparing for earthquakes are needed except improving method of conditions of grounds or pipes.