Comparative analyses of a multi-storey frame and wall using the current and draft loadings codes
The two draft loadings codes, DZ 4203-86 and 89, introduced major changes in both the response spectra used for seismic design and the methods of analysis. In this paper a wall and a frame, which have been proportioned to provide the seismic lateral load resistance for a 24 storey structure, are analysed by the methods given in these codes to highlight the differences. To simplify the comparison torsional effects have been omitted. The technique of finding a set of lateral loads, by taking the differences of the combined modal storey shears and using these to find the design structural actions, is shown to be inappropriate for structures analysed for the response spectra given in the draft loadings code (DZ 4203, 86 or 89), if the second or higher modes make a significant contribution to the combined modal storey shears.
Standards Association of New Zealand, "Code of Practice for General Structural Design and Design Loadings for Buildings", NZS 4203: 1984
Standards Association of New Zealand, "Draft code of Practice for General Structural Design and Design Loadings for Buildings", DZ 4203: 1986.
Standards Association of New Zealand, "Second Draft Code of Practice for General Structural Design and Design Loadings for Buildings", DZ 4203:1989.
Matuschka, T., Berryman, K.R., O'Leary, A.J., Mc Verry, G.H., Mulholland, W.M. and Skinner, R .I., "New Zealand Seismic Hazard Analysis", Bulletin of N.Z. National Society for Earthquake Engineering, Vol. 18, No. 4, Dec. 1985, P 314 - 322.
Fenwick, R.C. and Davidson, B.J. "Dynamic Behaviour of Multi-storey Buildings", University of Auckland, School of Engineering Report, No 463, Jan. 1989, pp.77.
Applied Technology Council, "Tentative Provisions for the development of seismic regulations for buildings", ATC 3-06, NBS SP-510, NSF 78-8, National Bureau of Standards USA, 1982.
Standards Association of New Zealand "Code of Practice on the Design of Concrete Structures" NZS 3101: 1982.
Paulay, T., "A Deterministic Design Procedure for Multi-storey Frames that are Exposed to Random Seismic Excitations", Proceedings ACMSM, Christchurch 1977, P. 170 - 180.
Copyright (c) 1989 R. C. Fenwick, B. J. Davidson
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