Reinforcement-Free Decks Using Modified Strut-and-Tie Model.

This study describes an application of a modified strut-and-tie model (STM) for determining the strength of reinforcement-free bridge decks on concrete wide-flanged girders. The method could also be applied to other short-span restrained concrete slabs. The concept presented for the reinforcement-free bridge deck includes a combination of removing steel reinforcement, using compressive membrane action in the deck by tying girders together, and introducing a polypropylene fiber to control shrinkage cracks. An analysis method for these reinforcement-free decks using a modified STM that considers geometrical nonlinearity is proposed. The model provides a two-dimensional (2-D) axisymmetric representation of the behavior of the reinforcement-free deck, and it is capable of capturing punching and flexural failure. Comparisons to nonlinear finite element method (FEM) analysis results were made to verify the proposed analysis method. A design load appropriate for reinforcement-free bridge decks is proposed. [ABSTRACT FROM AUTHOR]