Earthquake risk (prone) buildings
The Gisborne experience
DOI:
https://doi.org/10.5459/bnzsee.29.3.147-154Abstract
Recent completion of the Earthquake Risk (Prone) survey of unreinforced masonry buildings in the Gisborne District provides an opportunity to review the results achieved and, bearing in mind the re-draft of the Red Book, reflect on observed behaviour of local buildings in two "moderate" or close to "moderate" earthquakes. This paper gives a brief summary of the results of the Gisborne survey then discusses some of the actual damage sustained by the unreinforced masonry building stock in comparison with ground accelerations recorded in the 1966 "Gisborne" and 1993 "Ormond" earthquakes. Further comparison is made against theoretical loadings as represented by the 1965 and current design codes, and strengths as represented by the "Red Book" and its successor. The paper concludes with comment on the Earthquake Risk (Prone) Buildings survey process and "capture" threshold strength levels to be embodied in future legislative changes.
References
Hamilton RM, et al,1969. Gisborne Earthquake, New Zealand, March 1966, NZDSIR Bulletin 194.
Read S A L and Sritharan S, 1993. Reconnaissance Report on the Ormond Earthquake - 10 August 1993 Bulletin of the NZ Nat. Soc for £earthquake Engineering, 26(3): 292-308. DOI: https://doi.org/10.5459/bnzsee.26.3.292-308
B J Brown 1995. Implications of the Building Act 1991 for Earthquake Risk Buildings, NZ Struct. Eng. EPB Seminar, February.
Planning Tribunal, 1995 - Decision No. W 121/95 - Prime Investments Ltd vs GDC.
Read S A L and Cousins J, 1994. - The Ormond Earthquake of 10 August 1993 - An Overview of Ground Damage Effects and Strong Motions, Proc. NZ Nat. Soc. for Earthquake Eng. Technical Conference.
Wells J D, 1994. Earthquake Risk (Prone) Buildings - Effects and Damage in Gisborne City due to the Ormond Earthquake of JO August 1993, Proc. NZ Nat. Soc. for Earthquake Eng. Technical Conference.
NZNSEE, 1995. Earthquake Risk Buildings - Guidelines for Classifying, Interim Securing and Strengthening, New Zealand National Society for Earthquake Engineering, December.
NZNSEE, 1995. Draft Guidelines for Assessing and Strengthening Earthquake Risk Buildings, New Zealand National Society for Earthquake Engineering, February.
