Expressions for the calculation of ductility index for concrete girders with different ratios of prestressed and
classical reinforcement were proposed using load–displacement, load–strain and load–curvature relation. The results of
previous experimental static tests of several large-scale concrete girders with different ratio of prestressed and classical
reinforcement are briefly presented. Using the proposed expressions, various ductility index of tested girders were calculated
and discussed. It was concluded that the ductility of girders decreases approximately linearly by increasing the degree of
prestressing. The study presents an expression for the calculation of the average ductility index of classical and prestressed
reinforced concrete girders, which are similar to the analysed experimental test girders.
1Department of Concrete Structures and Bridges, Faculty of Civil Engineering, Architecture and Geodesy,
University of Split, Matice Hrvatske 21000 Split, Croatia
2Department for Mechanics, Materials and Construction, Faculty of Civil Engineering, University of Mostar,
Matice hrvatske b.b. Mostar, Bosnia and Herzegovina
3Department of Concrete Structures and Bridges, Faculty of Civil Engineering, Architecture and Geodesy, U
niversity of Split, Matice Hrvatske 21000 Split, Croatia
4Department for Mechanics, Materials and Construction, Faculty of Civil Engineering, University of Mostar,
Matice hrvatske b.b. Mostar, Bosnia and Herzegovina
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