par Rammer, Yves 
;Espion, Bernard
Référence Proceedings of the Institution of Civil Engineers. Bridge engineering, 167, 3, page (183-192)
Publication Publié, 2014-09-17
;Espion, Bernard Référence Proceedings of the Institution of Civil Engineers. Bridge engineering, 167, 3, page (183-192)
Publication Publié, 2014-09-17
Article révisé par les pairs
| Résumé : | This case study focuses on a concrete railway bridge built in 1960 at Clabecq (Belgium). The span is 60 m and the deck is a simply supported two-cells box girder. The selected system of post-tensioning was one of the last applications in Belgium of the Blaton-Magnel “sandwich” type.The cables were external to the concrete and only protected from corrosion by a cement grouting. Maintenance inspections in the 1990s revealed a generalized corrosion of the wires so important that the safety of the bridge could be endangered in a near future. The owners decided to carry out the replacement of all existing cables by new tendons placed in HDPE ducts composed each of 15 mono-strands.Following issues are addressed: assessment of the existing structure condition, experimental attempt to estimate in situ the residual prestressing force, design of the repair project, follow-up during operations on site, discussion about problems encountered and lessons learned from this exemplary economical intervention on early prestressed post-tensioned concrete structures. |
