Vulnerability of different classes of low-rise buildings in the
1987 Edgecumbe, New Zealand, earthquake

  • David J. Dowrick GNS Science, Lower Hutt, New Zealand
  • David A. Rhoades GNS Science, Lower Hutt, New Zealand

Abstract

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.

References

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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.

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Dowrick, DJ., Damage and intensities in the magnitude 7.8 1931 Hawke's Bay, New Zealand, earthquake, (in preparation).

Published
1997-09-30
How to Cite
Dowrick, D. J., & Rhoades, D. A. (1997). Vulnerability of different classes of low-rise buildings in the
1987 Edgecumbe, New Zealand, earthquake . Bulletin of the New Zealand Society for Earthquake Engineering, 30(3), 227-241. https://doi.org/10.5459/bnzsee.30.3.227-241
Section
Articles

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