Seismic design of New Zealand houses
DOI:
https://doi.org/10.5459/bnzsee.37.1.1-12Abstract
This paper presents the basis for changing the current test and evaluation procedure used to establish bracing ratings. This is known as the BRANZ P21 test method and is used to obtain the bracing ratings of timber framed wall systems for houses, and other low-rise structures, to meet the wind and seismic demand stipulated in the light timber framing standard, NZS 3604:1999. The demand seismic loads in NZS 3604 were based on the loadings specified in the New Zealand loadings standard, NZS 4203:1992. This paper proposes a revised P21 test seismic evaluation (called EM3) so that houses constructed to NZS3604 do not exceed their wall deformation capacity when analysed against a suite of earthquake records compatible with NZS 4203:1992.
References
Standards New Zealand, (1992). "Code of Practice for General Structural Design and Design Loadings for Buildings" (Known as the Loadings Standard). NZS 4203, Wellington.
Standards New Zealand, (1999). "Timber Framed Buildings". NZS 3604. Wellington.
King, A.B., (1997) Letter to SNZ 12/12/97. "Loading conditions for buildings to NZS 3604". Building Research Association of New Zealand. Judgeford.
Cooney, R.C. and Collins, MJ., (1978). "Racking Resistance Test and Evaluation Method for Timber Framed Walls". Building Research Association of New Zealand, Technical Paper P21. Judgeford.
Lim, K.C. and King, A.B., (1990). "Limit State Design Supplement to P21". Building Research Association of New Zealand. Judgeford.
Standards New Zealand, (1990). "Code of Practice for Light Timber Framed Buildings Not Requiring Specific Design". NZS 3604. Wellington.
Deam, B.L, (2001). "Seismic ratings for degrading structural systems". Bulletin, New Zealand Society for Earthquake Engineering, 34(3): 214 - 236, Wellington.
Thurston, SJ., (1993). "Report on racking resistance of long sheathed timber framed walls with openings". Building Research Association of New Zealand, Study Report 54, Judgeford, New Zealand.
Beattie, G. J., (2002). "Repair and reinstatement of earthquake damaged houses – derivation of repair techniques". In press. Building Research Association of New Zealand, Judgeford, New Zealand.
Carr, AJ., (2000). "Ruaumoko Computer Program User Manual". University of Canterbury, New Zealand.
Stewart, W.G., (1987). "The seismic design of shear walls". Ph.D. thesis, Department of Civil Engineering, University of Canterbury, New Zealand, 395 pp.
Beattie, G. J., (1998). "Earthquake induced lateral load sharing in low-rise hybrid structures incorporating timber framed and reinforced masonry walls". Structural Engineers World Conference. July 1998. San Francisco, USA.
Cooney, R.C., (1979). "The structural performance of houses in earthquakes". Bulletin of the New Zealand National Society for Earthquake Engineering 12 (3): 223-237. DOI: https://doi.org/10.5459/bnzsee.12.3.223-237
Davidson, B.J., (2000). "A suite of earthquakes to match NZS 4203 spectra". Personal communication.
