Date of Award


Degree Type


Degree Name

Master of Science in Civil Engineering (MSCE)


Civil and Environmental Engineering

First Advisor

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.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.