Full Session with Abstracts
Majority of residential dwellings constructed along the U.S. west coast are light-frame wood construction; a location where earthquake and tsunami represent the dominant natural hazards. Post-tsunami surveys show that the damage to residential wood houses is typically devastating, given the discrepancy between the hydraulic and hydrodynamic forces and wood structural resistance. Tsunami forces on building components such as wall panels, windows, doors, and floor systems can be predicted using advanced numerical models of fluid-structure interaction. It is well known that tsunami loading on the building depends on the flow direction and flow wake effects. However, current damage state definitions for tsunami fragilities are based on evaluating the total base-shear to predict the building deformation, neglecting the effects on individual components. This presentation focuses on a methodology to evaluate tsunami damage fragilities at the component level. Tsunami loading on each building component was evaluated simultaneously using fluid-structure interaction simulations, calibrated with full-scale physical models. Tsunami events were modeled as a single wave with a period of two hours progressing onto the coast, interacting with an existing residential wood dwelling in different directions. The proposed methodology shows the advantages of including component damage in building fragilities which can be used for tsunami damage assessment, loss analysis, and recovery assessments.