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Since NZS 1170.5:2004 Structural design actions - Part 5: Earthquake actions - New Zealand Commentary incorporating Amendment No. 1 was published in September 2016 there have been some questions raised over the interpretation of Table 8.1 Parts and Components, as applied to suspended ceilings. In particular should suspended ceilings be designed for the ultimate limit state (ULS) or the serviceability limit state (SLS) and how should Note 2 regarding mass and fall height be interpreted to determine whether or not an application is a life hazard risk. Ultimate limit state or serviceability limit stateWhen life hazard risks exist, there have been instances where suspended ceilings have been designed to the SLS rather than the ULS requirements. This is not the intent of the standard and it is recognised that some of the previous Standard and Commentary provisions may have contributed to this by not having been expressed clearly enough. The amendment to NZS 1170.5 was specifically drafted to clarify these design requirements.Section 8 of AS/NZS 1170.5 needs to cover all parts and components not just suspended ceilings, so the provisions reflect this scope.
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For suspended ceilings the intention is that designers look at all risk categories in Table 8.1 and design for the worst case. In most cases more than one risk category will apply. Where failure of the ceiling represents a hazard to human life or would impact the continuing function of the evacuation (after earthquake) and human life support systems within the structure, the ceiling is required to be designed to the ultimate limit state. This reflects the building code objective for Clause B1 Structure which is to safeguard people from injury caused by structural failure which means fatalities at the extreme.
Mass of individual items and fall heightNote 2(a) to Table 8.1 applies to risk category P1, P2, and P3 which represent a hazard to human life. The structure limit state for design in these categories is the ULS.
This is a strange request.Are you a student?You can learn how to apply this code from your design office if you're in the practice.Otherwise, you can pull a search for 'lateral force procedures' or something and you'll get samples from other model codes out there like say the IBC or something.Concepts are generally the same regardless of code.I would recommend Seismic Design Handbook by F. It is generally something you want to keep on your bookshelf if you're practicing structural engineering in a seismic area.
This book covers seismic load derivation and distribution (equivalent static) which would be the same (more or less) as the kiwi code.I hope this helps you. RE: NZS 1170.5 tutorial?