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The structural design of a building of 5 storeys and above requires consideration of disproportionate, (or progressive) collapse. OMNIDEC can provide a simple and cost effective means to satisfy all progressive collapse requirements.
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A local building element, such as a wall, floor, beam or column, may fail by overloading, material defect or exceptional load effect such as a gas explosion (eg Ronan Point).
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The designer must ensure that the building is capable of sustaining local damage without catastrophic failure, or progressive collapse.
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The floor plate is fundamental to providing the necessary robustness to a building.
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OMNIDEC is designed to include for not only the floor's service loadings but also the failure modes of all individual building elements.
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Failure of Supporting Partition Wall
Reinforcement is placed in the in-situ topping to connect the OMNIDEC panels which will then span to the next available support wall. Although deflection will be excessive, the floor will not fail.
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Failure of Supporting External Wall
Reinforcement is placed in the in-situ portion transverse to the initial span direction. In the event of a collapse, this becomes the main tensile steel, and the floor spans in the transverse direction.
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Debris Loading from Upper Floor
The calculations will take into account the crash load of debris from an upper floor and the design will include provision of sufficient reinforcement to cope with the expected load, as well as the construction, live and dead loads of the structure in normal circumstances.
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Due to the unique nature of the OMNIA system, Engineers can utilise either the OMNIDEC panels, or the in-situ portion of the slab to provide the means to cope with disproportionate collapse, simply and economically.
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