![]() ![]() One difficulty that can arise using this method is when there are a significant amount of services in the plenum space, which highlights the importance of considering seismic design as early as possible in the design process. The advantage of this method is that essentially all ceilings, no matter the size or weight, can be braced in this way. This bracing method is a lot more labour/ material intensive due to the additional braces and the time associated with installing them. The size of the seismic gap is dependent on the height of the plenum (distance between the suspended ceiling to the structure above) as well as the inter-story drift of the building. The floating edge allows for the differential movement between the ceiling and the walls/structure and is typically achieved through the use of a seismic clip as shown in Figure 1.Īs the suspended ceiling is now rigidly braced to the floor above it is essential that floating perimeter connections are installed on all surrounding walls to allow for differential movement, ensuring no damage in an earthquake. The fixed edge transfers the ceilings seismic loads into the surrounding walls which are fixed back to the building structure. ![]() This means mechanically fixing 2 adjacent edges of the ceiling to the surrounding walls and leaving the 2 opposite ceiling edges free to move horizontally. The first and simplest method is to ‘Fix’ and ‘Float’ the ceiling. There are 3 common methods used to seismically brace suspended ceilings ![]() Transferring these loads back to the building structure through seismic bracing. The weight of the ceiling, and therefore magnitude of seismic loads.ĭesign of the system to withstand horizontal seismic loads. When considering seismic bracing solutions, here are some of the key things to consider:ĭifferential movement between the ceiling and the building structure. But which one is best? The answer is largely dependent on the nature of the project at hand. When it comes to designing suspended ceilings to withstand seismic loads, there are a number of solutions to consider. ![]()
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