Lin, Sheng-Lin

Fragility Functions Derived for New Zealand Concrete Buildings With Reflections From Canterbury Earthquake Sequence

Abstract eng:
Fragility functions establish relationship between ground motion intensity and damage and they are collectively an important component in developing tools for seismic risk assessments. These functions can be derived by various methods supported by empirical data, expert opinion, and analytical models. In this study, a procedure based on displacement-based earthquake loss assessment (DBELA) is adopted to derive fragility functions for population of buildings. Focus is placed on concrete buildings particularly for the reason, in New Zealand cities, most of the non-residential buildings are of concrete construction. The characteristics of New Zealand buildings were exclusively modeled and not derived from models developed overseas as they are significantly different from New Zealand building stock. The method follows a probabilistic displacement-based approach that takes into account various sources of uncertainties in geometrical characteristics, deformation capacities of buildings and ground motion demands in deriving fragility functions. Spectral displacement demands from ground motions are modeled based on probabilistic seismic hazard analyses for a high seismicity region in New Zealand and real earthquake records from recent events. The probabilities of failure at different limits states are determined at various intensity levels of shaking and a least square regression method is adopted to fit cumulative lognormal distribution curves as fragility functions. In addition, a mapping scheme is proposed to translate the proportions of building damage distribution derived from fragility functions at a given intensity of shaking in terms of color tagging that is commonly used in post-event building safety evaluations. An attempt was made to calibrate the mapping scheme based on the observed damage statistics during Christchurch 2011 earthquake. The proposed mapping scheme can be used to predict with reasonable confidence the likely distribution of building damage (in terms of the commonly used damage states and/or color tags) in future earthquakes and will be useful in planning emergency response after an earthquake.

Contributors:

Uma, S R

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.