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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Pre-assessing the feseability of a design a performance function for scour protection systems in off...
Pre-assessing the feseability of a design a performance function for scour protection systems in offshore foundations
Author : TIAGO FERRADOSA (1) & FRANCISCO TAVEIRA PINTO (2)
ABSTRACT
The scour phenomena present a considerable risk to the stability and operability of an offshore or coastal structure (De Vos
L. et al., 2011). Several authors have been developing research, of great importance, regarding the prediction of scour (e.g.
Melville B. & Coleman S. E., 2000, Sumer S. & Fredsøe J., 2002, Whitehouse R. et al., 2011) and also concerning the theme
of scour protection (e.g. Nielsen A. et al., 2013, Matutano C. et al., 2013).
The design of offshore foundations and the analysis performed to the scour problems is still often based on empirical or
semi-empiric approaches (De Groot et al., 2006). The nature of these techniques does not account for the variability of major
variables, as the bed-shear stress, velocity or the turbulence levels, among others. In order to reduce the uncertainty, in the
design of offshore foundations, new approaches can be considered, namely the ones based on risk and reliability analysis,
which are already applied in other types of hydraulic structures, for example, Li C. et al. (2012), and Cheng J. & Li Q. (2009).
Applying these probabilistic approaches implies the definition of a solid performance function which aims to describe the
desired limit state of a designed structure. Once the performance function is obtained, it can then be used for the calculation
of the failure probability. This allows the project criteria to be defined taking into consideration the variability of scour
phenomenon, instead of only using the analysis performed purely based on the factor-of-safety which do not account for
such uncertainties (Faber M., 2009).
The present study aims to pre-assess a possible performance function and its feasibility, in order to be used in the design
of scour protection systems for offshore foundations, such as offshore windfarms. A case laboratory study is presented,
where the performance function is mainly based on the scour depths around a mono-pile foundation.
File Size : 363,174 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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