Hideaki Yanagisawa

DEVELOPING FRAGILITY FUNCTIONS FOR TSUNAMI DAMAGE ESTIMATION USING NUMERICAL MODEL AND POST-TSUNAMI DATA FROM BANDA ACEH, INDONESIA

Fragility functions, as new measures for estimating structural damage and casualties due to tsunami attack, are developed by an integrated approach using numerical modeling of tsunami inundation and GIS analysis of post-tsunami survey data of the 2004 Sumatra-Andaman earthquake tsunami disaster, obtained from Banda Aceh, Indonesia. The fragility functions are expressed as the damage probabilities of structures or death ratio with regard to the hydrodynamic features of tsunami inundation flow, such as inundation depth, current velocity and hydrodynamic force. They lead to the new understandings of the relationship between local vulnerability and tsunami hazard in a quantitative manner.

Investigation of Tsunami-Induced Damage and Fragility of Buildings in Thailand after the December 2004 Indian Ocean Tsunami

The December 2004 Indian Ocean tsunami caused human loss and devastating damage to civil engineering structures along the west coast of southern Thailand. This damage was investigated to evaluate the vulnerability of structures. Criteria for post-tsunami investigation were developed, and a database system was established to manage and present the data. The database of reinforced concrete (RC) buildings was then analyzed to find the relationship between the damage level and (a) the distance from the shoreline or (b) the inundation height. A representative RC columns capacity to resist lateral forces was measured by a full-scale loading test to gain insight into the relationship between the observed damage and the actual structural performance.