SEISMIC PERFORMANCE EVALUATION OF CORRODED WATER DISTRIBUTION SYSTEMS CONSIDERING FIRE-FIGHTING

Large earthquakes cause damages to pipes of water distribution systems (WDS), resulting in a deterioration of the functionality of these systems. This study evaluates the hydraulic performance of corroded WDS under earthquake loading and post-earthquake fires. The seismic failure probability of corroded water pipes is estimated using a modified American Lifelines Alliance (ALA) guideline and pressure-dependent hydraulic simulations of WDS are performed to capture hydraulic performance of WDS under stressed conditions. Two hydraulic performance measures are selected, including water service availability and the generalized resilience index, to evaluate the network's ability to provide sufficient water to consumers and to estimate excessive hydraulic energy, respectively. Performance is predicted at different age of the WDS, and under varied seismic intensities. The proposed framework is demonstrated for the ZJ water network. The results show that although firefighting activities do not considerably reduce the performance, they need to be considered in the recovery plan, as more customers lose access to water supply due to post-earthquake fires. The results show that hydraulic efficiency of the WDS worsens with network aging or higher seismic magnitudes.