engleski

Towards the use of UHPFRC in railway bridges: the rehabilitation ofBuna Bridge

In the last decade, Ultra High Performance Fibre Reinforced cement-based Composites (UH- PFRC) have been increasingly implemented for rehabilitation and strengthening purposes, rendering outstand-ing results. The ease of application, along with their superior mechanical and durability properties against othercementitious materials, constitute the drivers for their successful application. Despite this field being thoroughlyexplored and extensive literature already being available with respect to concrete and UHPFRC solutions, withparticular focus on bridges or maritime environments, research on UHPFRC combined with steel in structuressuch as steel decks or railway bridges has only recently surfaced. This paper provides an example of the latter:the Buna Bridge in Croatia is a 9m non- ballasted railway steel bridge built in 1893, and repaired in 1953 al-beit no longer in operation. The structure was transported in a laboratory setting for testing, envisioning a laterstrengthening by a prefabricated UHPFRC slab, connected to the original structure by means of steel studs.Dynamic and static test will be performed prior and after rehabilitation in order to compare the efficiency of thesolution and in particular the bond between the two materials. A detailed analysis on fatigue will be developed, based on the updated Finite Element model obtained form the results of the test, helping to deliver an appropri-ate design for the future strengthening. The results summarize the effective capacity of the girder and estimate the extension in the residual life of the beam on the basis of prediction of fatigue accumulation under regular operational conditions.

Life Cycle analysis, UH-PFRC, Buna Bridge

nije evidentirano