Comparative Study of Pre-tensioning and Post-tensioning Techniques in Prestressed Concrete: A Case Study of a Bridge Project in Tripoli

Abstract

Prestressed concrete technology is an advanced structural solution designed to enhance the mechanical performance of concrete elements and mitigate cracking and deflection caused by service loads. This technique relies on inducing internal compressive stresses to counteract tensile stresses during service, thereby improving durability, stiffness, and structural longevity.

This study explores the fundamental principles of prestressed concrete, highlighting the distinctions between pre-tensioning and post-tensioning regarding execution and application. It features a case study of a concrete bridge in Tripoli implemented via post-tensioning. The analysis is based on technical data from the executing company, including geometric dimensions, concrete properties, and prestressing tendon specifications.

Results indicate that post-tensioning significantly improved the bridge's structural behavior by reducing tensile stresses and cracking while increasing load-bearing capacity. The study achieved both structural and economic efficiency suitable for the project’s requirements. In conclusion, post-tensioning proves to be a reliable and effective choice for concrete bridge design, especially for long-span projects under variable environmental and operational conditions.