This book is developed frora two editions of notes "Ultimate Strength Design of Reinforced Concrete Structures" which were produced by the authors for extension study seminars for practicing engineers at the University of Canterbury.
A draft, revision to NZS4203:1984 [1] is now available for public comment. Significant changes to the existing seismic provisions are proposed. The basis for some of these are discussed and, where appropriate, resulting values are compared with the current provisions.
The paper deals with the design requirements for reinforced concrete diaphragms. Although diaphragms are primary members of the seismic force resisting system, ductile detailing of diaphragms is not considered to be required. While the design of diaphragms in regular framed buildings is straightforward, the analysis of transfer diaphragms involves more complex design criteria. Special considerations related to precast diaphragms are dealt with in more detail.
The paper indicates various aspects of the new earthquake loading provisions which are at present still in draft form.
Important changes from the previous code include requirements regarding ductility, energy dissipation, capacity design, concurrency effects, foundation design, torsional effects and separation of elements. The seismic design coefficients for buildings and part of buildings are related to zoning, building period, subsoil, importance factors, structural type, structural material and risk factors. Dynamic analysis is directly related to the codified equivalent static force spectrum.
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