Approach to Estimate Hysteretic Soil Damping in Piled Jacket Structures
Document Type
Conference Proceeding
Date of Original Version
1-1-2022
Abstract
This paper presents a quasi-static empirical approach for estimating hysteretic damping of axially loaded piles in an offshore wind jacket structure. Damping is important because it can reduce fatigue in these structures, which may experience many millions of loading cycles. The proposed approach is developed within a 't-z' analysis framework and based off modulus reduction and damping curves derived from dynamic element tests. A procedure and equations are provided to estimate the damping ratio through integration of the elastic strain energy density and dissipated energy density over the deformed soil mass. The relationship between damping and pile displacement, called a 'D-z' curve, is proposed for both discrete and lumped foundation models. Validation of the approach is still needed and research is ongoing.
Publication Title, e.g., Journal
Geotechnical Special Publication
Volume
2022-March
Issue
GSP 332
Citation/Publisher Attribution
Bradshaw, Aaron S.. "Approach to Estimate Hysteretic Soil Damping in Piled Jacket Structures." Geotechnical Special Publication 2022-March, GSP 332 (2022). doi: 10.1061/9780784484029.023.