A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Axial response of offshore jacket piles supporting wind turbines
This thesis addresses the design methods for offshore piles, and specifically the role of the end bearing of open-ended piles in contributing to capacity. In the design of offshore jacket structures, the response of open-ended tubular piles is governed by their interaction with the soil along the shaft and at the base. To estimate the total static capacity, the shaft and base capacities are estimated separately and added together. These estimates are based on empirical relationships correlated against the results of soil and pile tests. Many design methods exist for open-ended piles. However, for this research the design methods investigated are the API (2014), ICP (2005) and UWA (2005) methods. The target of these methods, is to estimate the load-carrying capacity of the designed pile, after an axial pile head displacement of 0.1D. Over the last few years, much research has focused on more accurately capturing this value, and much less on the distribution of the axial load between shaft and base. It has been found that, in general, the design methods investigated, do estimate the total capacity well. However, the capacity distribution can be improved. Recent pile tests performed using double walled piles in both sands and clays have revealed more about the behaviour of the soil plug, which contributes to the base capacity in open-ended piles, and are analysed here to gain a better understanding of the overall distribution. The role of the plug, in open-ended piles, is of significant concern for designers in determining its contribution to capacity. Simplifying assumptions are often made that the pile is either fully plugged or unplugged, and these assumptions directly impact foundation stiffness and capacity. In this research project, each of the design methods investigated employ a different criterion for plugging and therefore result in different foundation solutions. To study this problem, a one-dimensional, finite element analysis procedure has been written in MATLAB, which allows a detailed examination of ...
Axial response of offshore jacket piles supporting wind turbines
This thesis addresses the design methods for offshore piles, and specifically the role of the end bearing of open-ended piles in contributing to capacity. In the design of offshore jacket structures, the response of open-ended tubular piles is governed by their interaction with the soil along the shaft and at the base. To estimate the total static capacity, the shaft and base capacities are estimated separately and added together. These estimates are based on empirical relationships correlated against the results of soil and pile tests. Many design methods exist for open-ended piles. However, for this research the design methods investigated are the API (2014), ICP (2005) and UWA (2005) methods. The target of these methods, is to estimate the load-carrying capacity of the designed pile, after an axial pile head displacement of 0.1D. Over the last few years, much research has focused on more accurately capturing this value, and much less on the distribution of the axial load between shaft and base. It has been found that, in general, the design methods investigated, do estimate the total capacity well. However, the capacity distribution can be improved. Recent pile tests performed using double walled piles in both sands and clays have revealed more about the behaviour of the soil plug, which contributes to the base capacity in open-ended piles, and are analysed here to gain a better understanding of the overall distribution. The role of the plug, in open-ended piles, is of significant concern for designers in determining its contribution to capacity. Simplifying assumptions are often made that the pile is either fully plugged or unplugged, and these assumptions directly impact foundation stiffness and capacity. In this research project, each of the design methods investigated employ a different criterion for plugging and therefore result in different foundation solutions. To study this problem, a one-dimensional, finite element analysis procedure has been written in MATLAB, which allows a detailed examination of ...
Axial response of offshore jacket piles supporting wind turbines
Joseph, T (author) / Houlsby, G / Burd, H / Taylor, P
2019-08-12
doi:10.5287/ora-0njoq7gyg
Theses
Electronic Resource
English
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