FLOATING FOUNDATIONGEOTECH ENGINEERING - 2

ADALJA RAJAT :- 14SOECV11001 ANANT HIMANSHU :- 14SOECV11002

CHAUHAN BALBHADRA :- 14SOECV11006DALSANIYA ROHAN :- 14SOECV11010

DEFINATION OF FLOATING FOUN.

For a floating raft foundation, or floating foundation, the foundation has a volume such that, were 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 piles will support the building load, the final option is the use of a floating foundation, making the building like a boat that obeys Archimedes’ principle .

FLOATING FOUNDATION

A floating foundation consists of boxlike rigid structures set at such a depth below ground that the weight of the soil removed to place it equals the weight of the building

thus, once the building is completed, the soil under it will bear the same weight it bore before excavation was begun. 

FLOATING FOUNDATION

Floating foundation was a necessary innovation in the development of tall buildings in the wet soil of Chicago in the 19th century, floating foundation was developed by John Wellborn Root.

In simple words when the foundation is not supported by rigid soil mass or rock below the earth surface and it rest completely over the soil similar in friction pile then the foundation is termed as Floating foundation

e.g. Raft foundation

Pile foundation is a type of floating foundation, in which footing gets its support only by skin friction..

FLOATING FOUNDATION

FLOATING FOUNDATION

Watch video about construction of Wind-Turbine on offshore…

When the soil is so soft that even friction piles will not support the building load, the final option is the use of a floating foundation.

making the building like a boat that obeys Archimedes’ principle, it is buoyed up by the weight of the earth displaced in creating the foundation. 

FLOATING FOUNDATION

FLOATING FOUNDATION

Example 1 Example 2

REVIEWER

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).

Millbank Prison was a prison in Millbank, Pimlico, London, originally constructed as the National Penitentiary, and which for part of its history served as a holding facility for convicted prisoners before they were transported to Australia. It was opened in 1816 and closed in 1890.

Millbank Prison in the 1820s.

BENEFITS

Maintenance free. No antifouling or treatment needed. Very large floating foundations can be built using the FlexBase system. Enables floating homes to be seen as buildings so they can have build

regulations applied to them. Fantastic longevity when compared to steel hulls (in fact, even better

than many house foundations).

CASE STUDY

1. J. M. Jonkman, “Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine,” NREL Technical Report No. TP-500-41958, November 2007.

2. American Petroleum Institute, Recommended Practice for Planning and Constructing Fixed Offshore Platforms—Working Stress Design, 2000.

3. A. Aubault, C. Cermelli, and D. Roddier, in “Parametric Optimization of a Semi-Submersible Platform with Heave Plates,” Proceedings of the OMAE’07, 26th International Conference on Offshore Mechanics and Arctic Engineering, San Diego, 11–16 June 2007.

CASE STUDY

4. A. R. Henderson and M. H. Patel, Wind Energy 6, 53 (2003). 5. S. Butterfield, W. Musial, J. Jonkman, P. Sclavounos, and L.

Wayman, in “Engineering Challenges for Floating Offshore Wind Turbines,” Copenhagen Offshore Wind 2005 Conference and Expedition Proceedings, Copenhagen, Denmark, 26–28 October 2005.

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