Date of Award
Master of Science in Civil Engineering (MSCE)
Civil and Environmental Engineering
Aaron S. Bradshaw
The objective of this thesis was to evaluate a simplified quasi-static modeling approach to estimate the hysteretic damping of axially loaded piles for offshore wind jacket structures. The objectives were achieved through analysis and modeling of existing pile load test data at two test sites from the literature. The investigation of axial cyclic load test data involved the analysis of the load-displacement hysteresis loops to quantify the hysteretic damping. The modeling used a static t-z analysis to estimate the hysteretic damping. The measured and modeled damping ratios were compared and it was found that the model underpredicts the measured damping at all cyclic displacement and cyclic load levels. The results are promising in that the proposed model might be useful for providing a lower bound and thus conservative estimate of damping as the model ignores interface slippage up to the point where the maximum shaft resistance is reached, which would increase the damping.
Reich, Charlotte, "ANALYSIS OF HYSTERETIC DAMPING IN AXIALLY LOADED PILES" (2021). Open Access Master's Theses. Paper 2098.