Development of Prototype structures becomes very costly to study the exact behaviour of precast prestressed girders belonging to a new form. Therefore, modelling post-tensioned bridge-girders to understand the structural performances is necessary. The Concrete Damaged Plasticity (CDP) model of ABAQUS software was applied in modelling the structural behaviour of Twin-T (TT) girders in the present study. The TT girder was from a research program for developing standardized, modularized and restricted depth highway girders for making Road Over Bridges (ROBs) across railway tracks. The authors conducted an experimental study on two specimens of girder-deck assembly having the similar features of the developed prototype girder-deck assembly using the High Strength-high Performance Pre-stressed (post-tensioned) concrete (HS-HP-PSC) of M55 mix. The modelling, simulating the experimental studies, was developed and, the same was calibrated with the help of experimental results. The discussion includes various input parameters that influenced the accuracy of the model. The developed CDP model was confirmed to be consistent and reliable in replicating the observed structural performances of both the TT girder-deck specimens. The Finite Element Modeling (FEM) techniques developed in this study are expected to be valuable in developing the FEM for the real highway decks of various spans.
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