It was also considered reasonable to clarify that some damage can be expected at the SLS simply due to the complexity of the load paths through the ceiling grid and abutting structure under seismic actions. Table 2.4.3 was included to define the minimum SLS drift requirements, with an overall limit not less than 0.4 times that of ultimate. New Zealand have considered SLS for ceiling systems for some time, and it was appropriate for Australia to provide clarity in this area as well. More importantly, it is unlikely that these buildings would have a movement report available for the ceiling designer.įor the ULS condition, the ceiling code adopts the maximum drift allowance from the respective seismic codes for Australia and New Zealand, unless a specific alternative value is provided. This may not necessarily be true in all cases as the ceiling may fail due to impact with the structure at an SLS condition due to inadequate allowance for differential movement between the structure and the ceiling. In Australia, serviceability is deemed to comply when the ceiling is designed in accordance with AS1170.4 for Importance Level 2 (IL2) and 3 (I元) buildings. Inter-storey drift has been expanded and clarified for both Australia and New Zealand, incorporating Ultimate (ULS) and Serviceability (SLS) Limit State requirements. The following table has been added into the new Standard and defines the appropriate ductility factors to be used for member and connection design for both Australia and New Zealand. When comparing the new Standard AS/NZS2785:2020 to the superseded AS/NZS2785:2000, you’ll come across the following changes. WHAT’S NEW FOR SECTION 2 DESIGN REQUIREMENTS? The following is a summary of what we believe to be the more important changes. These are some of the obvious changes but, there have been a lot of smaller more subtle changes that need to be considered as well.Īs an example, you will see the word ‘action’ has replaced ‘load’ which is the definition provided in AS/NZS1170.0. Some of the first things you’ll notice is that the standard has increased from 47 pages to 87 pages, it has a greater focus on earthquakes and life safety-critical applications and all the Sections have been shifted around. This alignment includes not only terminology, definitions and notations but also load combinations as per AS/NZS1170.0. However, one of the primary drivers for the new code was to bring the document into alignment with the AS1170 series loading codes, which all had undergone significant revisions during the same period. Nearly everything in the new code has changed, and it certainly was overdue for an update, with the current standard being published way back in 2000. However, as this blog is just a short review, you should still download and read through a full copy of the new Standard. To help you understand the changes, we’ve gone through the new Standard and provided a summary of the changes below. AS/NZS2785:2020 has an impact on the industry from the way ceilings are designed and tested, through to how they are installed and lastly, how they should be maintained. At the end of last month, a new Standard ‘Suspended Ceilings – Design and Installation’ was released.
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