Is it a "Seismic project"?
AMF Ceilings (Australia and New Zealand)
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If you find yourself asking the question ‘is this a seismic project?’, it probably is.
There is some confusion in the Australian market with regards to what types of building projects require seismic design for non-structural elements, so let’s see if we can clear this up!
The ‘A’ in AS 1170.4-2007 stands for Australia
So, if you are installing ceilings and/or partitions in Australia, you’ll need to consider this standard just like you would any other Australian Standard. AS 1170.4-2007: Structural Design Actions Part 4: Earthquake actions in Australia requires earthquake loads on both structural and non-structural components to be considered in the design of all buildings in Australia. The term ‘non-structural’ includes (but is not limited to) suspended ceilings, partitions, services, etc.
OK, not EVERY structure requires seismic engineering
Table B1.2a of the NCC explains the Importance Level of the building based on the type and purpose.??
So, which structures may not require seismic design considerations for ceilings and partitions? Most ‘Importance Level 1’ structures will not require special design – here are some examples:
In summary, unless you’re involved in constructing something like the above, you will need to consider how to design and install the non-structural elements to comply with AS 1170.4-2007.
Brace yourself for solutions
It’s important to factor seismic engineering into the cost of designing and/or installing your ceiling system and to get this process started as soon as possible. The cost of engineering can vary significantly depending on the size of the project and the complexity of the systems being installed. It’s also important to be aware of how the ceiling will need to be installed and which components are required prior to beginning installation.
AMF Ceilings distributers can offer the services of a third-party engineering consultant for ceilings only, provided AMF systems are being installed. Simply speak with your AMF Ceilings distributer about getting a quote and they will provide you with a design request form which you can complete and return to them along with the required documents. Alternatively, you can engage with your own engineering consultant. Once your seismic design is complete, you’ll receive a document explaining how you will need to brace the ceilings – perimeter-bracing (fix/float) or plenum-bracing.
The perimeter-bracing (fix/float) method involves having two perpendicular ceiling perimeters mechanically and rigidly fixed to the walls and the alternate perimeters facilitating movement, using perimeter clips. The lateral seismic load would be transferred to the fixed perimeters, so the walls will need to be designed to take the specified lateral load.
The plenum-bracing method involves having 45 degree bracing from the grid up to the underside of the structure. The lateral seismic load would be transferred through the braces up to the underside of the structure. Perimeter clips are still required with this method however, they will all be installed as ‘floating’ perimeters.
Which method is specified in the seismic design will depend on many factors such as soil type, structure height, ceiling weight, the suspension system, the size of the area, etc.?
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Here are some FAQs to wrap things up.
Q: Who’s responsible for compliance?
A: We all are. This is a shared responsibility amongst manufacturers, architects, certifying engineers, head contractors and installers.
Q: I’m a contractor who’s working on a project and the specification doesn’t mention this. Does this mean it’s not required?
A: No. Even if seismic consideration isn’t mentioned in the specification, there would be a section in the specification or contract which states that you must comply with all Australian Standards (including AS 1170.4-2007).
Q: I’m working on a refurb of an existing office building. Will the ceilings need to comply with seismic standards?
A: Yes. All new work needs to comply with current standards.
Q: I’ve installed a project before using perimeter clips to fix and float the ceiling. Can’t I just do that every time?
A: No. Every project is different and there are many factors to consider when engineering a solution. Each project needs to be individually designed.
Q: I have received a seismic design document; however, I have now decided to use a different suspension system. Can I still use the same seismic design document?
A: No. Every suspension system has different capacities, so the seismic design will need to be recalculated and redesigned based on the alternative system and its relative capacities.
Need more information?? Contact your AMF distributer or contact us at [email protected]
Erich Zeidler, Product Category Manager
Australian Mineral Fibre Pty Ltd
Director / Technical Development
2 年Great work Erich!
Director / Technical Development
2 年Fantastic article Eric, looking forward to seeing you soon
Co-Founder at TRACKLOK? Ltd
2 年Well done Erich - simple seismic 101.
Efficient Seismic Bracing and Suspension Solutions for Building Services
2 年Everybody has to pay for parking in the city, however if there were no parking inspectors how many people would have the honesty to just pay? Where are the building certifiers? Seismic bracing industry in Australia is too self-policed for it to be carried out compliantly. Good article btw ??
National Commercial Business Manager at Dulux Commercial.
2 年Nice article Erich!