Calculation of Effective Stress in Prestressing Tendons
Properties of Pre- and Post-Tensioned Hybrid Epoxy–Cement Concrete Members for Construction Applications, wiley, ss.91-97, 2026
- Yayın Türü: Kitapta Bölüm / Araştırma Kitabı
- Basım Tarihi: 2026
- Doi Numarası: 10.1002/9781394219384.ch5
- Yayınevi: wiley
- Sayfa Sayıları: ss.91-97
- Anahtar Kelimeler: bonded and unbonded systems, composite tendons (CFRP, GFRP, BFRP), creep and shrinkage, effective stress, elastic shortening, friction losses, long-term durability, prestress losses, prestressing tendons, relaxation, simplified loss estimation, structural serviceability
- İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet
Özet
The determination of effective stress in prestressing tendons is central to the reliability and long-term performance of prestressed concrete structures. This chapter provides a comprehensive framework for evaluating tendon stress, beginning with the initial jacking force and tracing its reduction through immediate and time-dependent loss mechanisms. Stress states are examined in both bonded and unbonded systems, highlighting the influence of tendon geometry, anchorage behavior, and material properties. Immediate losses—such as friction, elastic shortening, and anchorage slip—are analyzed alongside long-term effects including creep, shrinkage, and relaxation, with emphasis on their interactions and cumulative impact on serviceability. Recent advances in analytical modeling, particularly for composite tendons such as Carbon fiber reinforced polymer (CFRP) and Glass Fiber Reinforced Polymer (GFRP), have been integrated into the discussion, offering refined predictive tools for modern applications. Simplified estimation methods are also reviewed, balancing computational efficiency with practical accuracy for routine design. The chapter underscores that tendon stress is not static but evolves under operational loads, environmental conditions, and structural deformation, necessitating both comprehensive calculation methodologies and field verification. By synthesizing theoretical models, experimental findings, and code-based approaches, the chapter establishes a robust methodology for calculating effective tendon stress, ensuring durability, crack control, and long-term structural integrity in prestressed systems.