Vulnerability of different classes of low-rise buildings in the 1987 Edgecumbe, New Zealand, earthquake
This paper describes an analysis of costs of damage to non-domestic buildings (all tow rise) in the Mw = 6.6 Edgecumbe New Zealand earthquake of 2 March 1987. The damage cost for each building was converted to a damage ratio by dividing it by the replacement value of that building. For the MM7 and MM9 intensity zones, the mean values and statistical distributions of these damage ratios were then found, the lognormal distribution fitting the data well. The data was then divided into subsets according to selected classes of construction, and the vulnerabilities of these classes were measured and compared in terms of their mean damage ratios and the associated 95% confidence limits. The classes of building examined included classifications by era of design, number of storeys, materials of construction, and building use. Valuable insights into earthquake resistant design and earthquake risk assessment parameters were obtained through the differences observed between classes, notably significant reductions in the vulnerability of buildings associated with improved ductility provisions.
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Dowrick, DJ. and Rhoades, D.A. (1990), Damage ratios for domestic buildings in the 1987 Edgecumbe earthquake, Bulletin NZ National Society for Earthquake Eng., 23(2), 137-149.
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Dowrick, D J. and Rhoades, D.A. (1993), Damage costs for commercial and industrial property as a function of intensity in the 1987 Edgecumbe earthquake, Earthquake Engineering and Structural Dynamics, 22, 869-884. DOI: https://doi.org/10.1002/eqe.4290221004
Dowrick, D.J. and Rhoades, D.A. (1995), Damage ratios for commercial and industrial equipment and stock in the 1987 Edgecumbe, New Zealand, earthquake, Bulletin NZ National Society for Earthquake Engineering, 28(4), 265-278. DOI: https://doi.org/10.5459/bnzsee.28.4.265-278
Dowrick, D. J. and Rhoades, D. A. (1997), Inferences for design, insurance and planning from damage in past New Zealand earthquakes, Journal of Earthquake Engineering, 1(1), 77-91. DOI: https://doi.org/10.1080/13632469708962362
MP 12: 1965, Commentary on Chapter 8 of NZSS 1900, New Zealand Standards Institute, December 1965.
Zhao, J.X., Dowrick, D.J. and G.H. McVerry, (1997), Attenuation of peak ground accelerations in New Zealand earthquakes, Bulletin NZ National Society for Earthquake Engineering, 30(2), 133-158. DOI: https://doi.org/10.5459/bnzsee.30.2.133-158
Dowrick, D. J., Rhoades, D.A., Babor, J. and Beetham, R.D. (1995), Damage ratios for houses and microzoning effects in Napier in the magnitude 7.8 1931 Hawke's Bay, New Zealand earthquake, Bulletin NZ National Society for Earthquake Engineering, 28(2), 134-145.
Dowrick, DJ., Damage and intensities in the magnitude 7.8 1931 Hawke's Bay, New Zealand, earthquake, (in preparation).
Copyright (c) 1997 David J. Dowrick, David A. Rhoades
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