Civil Research Tasks | Martin Moravcik | Evaluation of Prestressed Concrete Bridges in Slovakia

Martin Moravcik | Professor, Department of Concrete Structures and Bridges, University of Žilina, Slovakia

October 18, 2023 | 11h00-12h00 | Room U.0.6 (hybrid mode) | https://videoconf-colibri.zoom.us/j/93285885760 | Lusófona University, Lisbon, Portugal

Abstract: Recently more attention has been paid to aging infrastructure under increased traffic on the roads in Slovakia. Some prestressed bridges built in the 1960’s are currently in service over 50 years. Many of them have been inspected and poor technical condition has been found out. Serious faults as a wide cracks, large permanent deformation and extensive prestressing degradation have been observed on many of them. The level of residual prestressing has a decisive impact on the behaviour of prestressed concrete structures. Therefore, the determination of this crucial factor is a very important but also difficult task. Nowadays, engineers and researchers intend to verify a lot of various techniques which provide the value of residual prestressing force. This talk is focused on the application of the Saw-cut Method and Crack reopening method performed on prestressed concrete beams. This talk is also deal with the design of rehabilitation of prestressed segmental bridge using the structural system changing and additional external prestressing application. The initial assumptions for the rehabilitation have been based on detailed analysis of the defects and analytical way of current prestressing level determination.