Date of Award

Spring 5-10-2025

Level of Access Assigned by Author

Open-Access Thesis

Degree Name

Doctor of Philosophy (PhD)

Department

Civil Engineering

First Committee Advisor

Aaron Gallant

Second Committee Member

William G. Davids

Third Committee Member

Luis Zambrano-Cruzatty

Additional Committee Members

Keith Berube

Senthil Vel

Abstract

The structural performance of micropile threaded connections under bending loads is crucial for deep foundation systems. This research explores their flexural behavior through experimental testing and analytical modeling. A comprehensive testing program examined 60 micropile specimens under different thread configurations, reinforcement conditions, and combined loading scenarios. Four-point bending tests on casings with varying diameters (178, 194, 244, and 346 mm) and variable threaded details, highlight the influence of connection length and thread geometry on structural integrity of the connection. Additionally, a methodology was developed to predict bending capacity and failure modes --jump-out or rupture. The findings demonstrate that flexural performance is governed by specific thread details, providing valuable insights for refining design guidelines and improving micropile reliability in practice.

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