AXIAL FORCE DEPENDENT PUSHOVER ANALYSIS MODEL FOR LATERALLY LOADED PILES
Journal
Journal of GeoEngineering
Journal Volume
17
Journal Issue
2
Date Issued
2022-06-01
Author(s)
Lin, Yi Shao
Abstract
Piles subjected to lateral loads also sustain axial loads, which may influence the flexural property of pile sections. To simulate the effects of axial loading on the pile section in nonlinear pushover analysis, this paper presents a pile model that reflects the distribution of flexural rigidity on the basis of initial axial forces in the pile and the change in plastic hinge properties due to varying axial forces. Based on the moment-curvature curves of pile sections at various axial forces obtained from section analyses, both an effective flexural rigidity-axial force relationship and the axial force dependent plastic hinge properties, including the axial force-effective yield moment interaction curve and normalized moment-plastic curvature curves, are constructed for the model. This model is used to simulate pile load tests in the literature, and reasonable predictions are obtained. Parametric analyses are conducted to examine model performance and the influence of varying axial loads on pile response. The conventional method that considers a constant axial load overestimates the lateral stiffness and strength during compression but underestimates those during tension for a single-pile condition. Regarding a group-pile condition, our proposed model can discern the difference in moment profiles and the development of plastic hinges between the front and back piles.
Subjects
Axial loading | Lateral loading | Moment-curvature curves | Plastic hinges | Pushover analysis
Type
journal article