from the conferences organized by TANGER Ltd.
In December 2017 there was a crash of footbridge in Prague – Troja. This failure led to an increase in interest in current status of prestressed concrete stress-ribbon bridges in the Czech Republic and maximum effort to prevent another accident. During next years were identified and subsequently closed other footbridges with proven structural failure of bearing parts. The presented paper describes material analysis of prestressed concrete construction performed on one of observed footbridge. Material analyses confirmed the good material condition except of corrosion attack concentrated in the middle part of the footbridge and especially in the connections between neighbouring segments. Performed analyses revealed fatal decrease of diameter of most strands in the critical middle part of the bridge caused by corrosion enhanced by the maintenance by salting during winter and, most probably, also by two floods in the near past. Main purpose of experimental research was to identify weak spots in construction which contributes to development of corrosion of bearing cables in prestressed concrete construction.
Keywords: Prestressed concrete construction, corrosion, bearing cable, metallography, fractography© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.