Development of displacement based NZ building fragility functions for ground motion hazard

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Uma, S.R.; Bradley, B.A. 2010 Development of displacement based NZ building fragility functions for ground motion hazard Lower Hutt, N.Z.: GNS Science. GNS Science report 2010/33 21 p.

Abstract: Fragility functions provide a probabilistic representation of damage potential due to a hazard of a varying intensity. In this report, a simplified probabilistic displacement-based framework is adopted to develop fragility functions for NZ building inventory subject to ground motion hazard. A previously developed building classification scheme is used to encompass the predominant NZ building categories, which is based on observations from pilot studies conducted in three regions (Christchurch, Hawke’s Bay and Westport). Almost 70% of the building inventory is residential buildings, 20 % being commercial buildings and 10% being industrial buildings. A sub classification is also used to distinguish between their inventory construction material, structural system and year of construction. Fragility of buildings can be assessed by various methods. In this study, a simplified displacement-based approach has been adopted to predict the seismic displacement capacity of buildings. Four damage states defined as slight, moderate, severe and complete were adopted and using the displacement-based approach the displacement capacity fragility is quantified by its median and dispersion. Seismic displacement demands at a site can be estimated using attenuation models for a given site distance and soil condition, etc. This report represents only the essential steps involved in the proposed methodology to arrive at the probability of failure for a given damage state. (auth)