Editing Floating raft system

{{short description|Seismic stabilized building foundation}}
{{Unreferenced|date=June 2019|bot=noref (GreenC bot)}}
'''Floating raft''' is a land-based building [[foundation (architecture)|foundation]] that protects it against settlement and [[soil liquefaction|liquefaction]] of soft soil from seismic activity. It was a necessary innovation in the development of [[skyscrapers|tall buildings]] in the wet soil of [[Chicago]] in the 19th century, when it was developed by [[John Wellborn Root]] who came up with the idea of interlacing the concrete slab with steel beams. The earliest precursor to the modern version may be the concrete rafts developed for the building of [[Millbank Prison]] in 1815 by [[Robert Smirke (architect)|Robert Smirke]].

For a floating raft foundation – or simply "floating foundation" – the foundation has a volume such that, if that volume filled with soil, it would be equal in weight to the total weight of the structure.

When the soil is so soft that not even [[friction pile]]s will support the [[building load]], these types of foundation are the final option and makes the building behave like a boat: obeying [[Archimedes' principle]], buoyed up by the weight of the earth displaced in creating the foundation.
==Buildings with a floating raft system==
*[[Jin Mao Tower]] (1999) in [[Shanghai]], China
*[[Rönesans Rezidans]] (2012) in [[Antakya]], Turkey
==See also==
*[[Buoyancy]]
*[[Building construction]]

{{DEFAULTSORT:Floating Raft System}}
[[Category:Foundations (buildings and structures)]]