RESTORATION OF A LANDMARK BALANCED CANTILEVER BRIDGE CONSIDERING DIFFERENT RESILIENCE AND SUSTAINABILITY STRATEGIES

This paper examines a landmark bridge upon which the road network functionality and life of people living in the region are heavily dependent. The Servia High Bridge, also known as the Lake Polyfytos Bridge, and it is the second longest bridge in Greece, spanning 1,372 meters. It was constructed by XEKTE SA and designed by Prof Riccardo Morandi. The bridge was designed around about the same time with the artificial Polyfytos lake, its construction started in 1972 and was completed in 1975. Strong connections exist between the nation's 48-year-old iconic bridge and the most significant power plants in South East Europe. The risk and resilience of the bridge and surrounding network have been assessed using a combination of visual inspections and digital data collection based on: (a) a digital twin, which provides a snapshot of the asset's current geometry and a dynamically evolving model that can inform advanced simulations; (b) satellite imagery, which offers ongoing updates and information about the asset's deformations and geometry; and (c) advanced numerical modeling, where based on back analysis an interpretation of the current deflections is attempted. The bridge exhibits degradation typically met in reinforced concrete (RC) and PRC (prestressed RC) bridges. In particular, the present case study is faced with challenges relating to the corroded tendons and concrete bonding. In this paper, different retrofitting measures are examined either the speed of recovery and the CO2 of the materials for retrofit, which reflect the resilience and sustainability of the examined strategies, based on FEM and monitoring data that lead to decisions.