Progressive collapse assessment of prestressed concrete beams

• Main Authors: Lin, Haoran, Luo, Da, Li, Bing
• Other Authors: School of Civil and Environmental Engineering
• Format: Article
• Language: English
• Published: 2024
• Subjects: Engineering; Progressive collapse; Concrete beam-column
• Online Access: https://hdl.handle.net/10356/176122
• Institution: Nanyang Technological University

In the realm of modern construction, prestressed strands are increasingly employed to enhance the resistance of structures against progressive collapse. To delve into the collapse mechanisms of unbonded and bonded prestressed concrete beam-column assemblies, this paper presents a parametric analysis based on a calibrated finite element method. The influence of various parameters, including concrete compressive strength, top/bottom longitudinal reinforcement ratio, tendon ratio, tendon yield strength, and span/depth ratio, on two critical progressive collapse resistance mechanisms – compressive arch action (CAA) and catenary action (CTA) is thoroughly examined. Moreover, the impact of these variables on the displacement at fracture is also explored. The study reveals that the top/bottom longitudinal reinforcement ratio plays a significant role in enhancing the progressive collapse resistance capacity, while the contributions of concrete compressive strength and tendon yield strength are less pronounced. It is observed that the span/depth ratio alters the trend of tendon ratio and influences the change rates of other variables. Finally, these conclusions are corroborated by coefficients obtained from multiple linear regression.