Title:
Reinforcement-Free Decks Using Modified Strut-and-Tie Model
Author(s):
Han Ug Bae, Michael G. Oliva, and Lawrence C. Bank
Publication:
Structural Journal
Volume:
108
Issue:
5
Appears on pages(s):
562-571
Keywords:
bridge decks; compressive membrane action; deck analysis; precast prestressed girder; punching shear; strut-and-tie model; wide-flanged concrete girder
DOI:
10.14359/51683213
Date:
9/1/2011
Abstract:
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.