This 3 PDH online course is intended for structural and geotechnical engineers, as well as design and construction personnel involved in coastal design and construction projects. The walls, lattice, or screening are intended to collapse under wave loads without causing collapse, displacement, or other structural damage to the elevated building or the supporting foundation system. As such, NFIP regulations require that the area below the lowest floor of elevated buildings either be free of obstructions or have any enclosed areas be constructed of non-supporting breakaway walls, open lattice-work, or insect screening. and Construction Guidance for Breakaway Walls for more information. Obstructions below an elevated building can significantly increase the potential for flood damage by increasing the surface area subject to wave impact and velocity flow. Breakaway walls must be designed to break free under the larger of: 1) the design. Had it broken-away as designed, there likely wouldn’t have been any damage to the livable area of this building.This engineering online PDH course provides guidance on designing and constructing breakaway walls below elevated buildings located in coastal high hazard areas in accordance with the National Flood Insurance Program (NFIP). A large obstruction can be seen behind the wall, preventing it from breaking-away. The window was smashed and flood waters rushed inside. When this wall failed to break-away, the wave action was deflected upwards. If designed properly, the following photograph shows how a ground floor enclosure with breakaway walls would/should look after a ravaging storm. Wooden lattice will break more readily when struck by floating debris. It won’t break, and will collect a large amount of debris causing the wave action force to be transmitted to the entire building.
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