A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Insights into the Performance Reliability of Offshore Piles Based on Experience in Hurricanes
Between 2004 and 2009, five major hurricanes in the Gulf of Mexico loaded numerous offshore platforms and their pile foundations to near or beyond their capacities. The performances of these foundation systems provide a tremendous opportunity to learn about their reliability and to improve design practice. A set of 13 platforms are analyzed in detail based on hindcast data for the hurricane loads. The foundation systems for these platforms represent a range of characteristics with non-redundant and highly redundant systems, systems governed by the lateral capacities and systems governed by the axial capacities of the piles, and systems with piles driven primarily in normally consolidated marine clays and those with piles driven in interbedded sands and clays. An upper-bound plasticity model, calibrated to match a three-dimensional finite element method model, is used to predict the performance of these foundation systems. A probabilistic approach is then used to update information about the systematic bias in predicting the capacities of the foundation systems and hurricane loads. Findings from this work include (a) actual and predicted performances of the 13 foundation systems agree reasonably well, (b) the use of nominal versus expected yield stress for steel affects the predicted performance and reliability, and (c) the robustness and redundancy of a foundation system have a significant effect on its reliability.
Insights into the Performance Reliability of Offshore Piles Based on Experience in Hurricanes
Between 2004 and 2009, five major hurricanes in the Gulf of Mexico loaded numerous offshore platforms and their pile foundations to near or beyond their capacities. The performances of these foundation systems provide a tremendous opportunity to learn about their reliability and to improve design practice. A set of 13 platforms are analyzed in detail based on hindcast data for the hurricane loads. The foundation systems for these platforms represent a range of characteristics with non-redundant and highly redundant systems, systems governed by the lateral capacities and systems governed by the axial capacities of the piles, and systems with piles driven primarily in normally consolidated marine clays and those with piles driven in interbedded sands and clays. An upper-bound plasticity model, calibrated to match a three-dimensional finite element method model, is used to predict the performance of these foundation systems. A probabilistic approach is then used to update information about the systematic bias in predicting the capacities of the foundation systems and hurricane loads. Findings from this work include (a) actual and predicted performances of the 13 foundation systems agree reasonably well, (b) the use of nominal versus expected yield stress for steel affects the predicted performance and reliability, and (c) the robustness and redundancy of a foundation system have a significant effect on its reliability.
Insights into the Performance Reliability of Offshore Piles Based on Experience in Hurricanes
Chen, Jiun-Yih (author) / Gilbert, Robert B. (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
2014-02-24
Conference paper
Electronic Resource
English
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