DUCTILITY IMPROVEMENT STRATEGIES FOR HOLLOW PRESTRESSED CONCRETE PILES

The book presents a comprehensive exploration of pile foundation systems, with a particular emphasis on the structural behavior of prestressed and slender concrete piles under various loading conditions. Beginning with fundamental concepts of pile foundations, the discussion expands toward the challenges commonly observed in prestressed hollow piles, including issues of serviceability, flexural vulnerability, and strength degradation. The early chapters establish a conceptual foundation by outlining the mechanics of ductility, plastic hinge formation, and the influence of prestressing forces, providing readers with a coherent understanding of the structural limitations that necessitate enhanced reinforcement strategies.

Building upon these foundational principles, the middle chapters examine a range of structural enhancement methods designed to improve strength, ductility, and overall performance. These include concrete infill techniques, the role of transverse reinforcement, and various external confinement approaches using steel jackets, plates, and sheathing systems. Each method is discussed in relation to its influence on axial behavior, flexural resistance, confinement pressure, and the resulting stress–strain characteristics of both concrete and composite pile systems. The analysis incorporates conceptual, mechanical, and code-based perspectives to offer a holistic view of how structural refinement can effectively address the deficiencies inherent in slender and hollow prestressed piles.

The later chapters synthesize these concepts through an in-depth behavioral analysis of slender concrete columns and spun piles equipped with thin steel sheet confinement. Detailed attention is given to material properties, load eccentricity effects, confinement-induced stress responses, and the performance of piles with additional infill or external steel-plate reinforcement. By integrating discussions on constitutive modeling, strain localization, and fracture mechanics, the book offers an extensive narrative that links theoretical principles with practical strengthening strategies. The final sections, including the bibliography and author’s biography, provide contextual depth and scholarly grounding for the comprehensive structural discourse presented throughout the volume.