Transverse Cracking Of Composite Bridge Decks
Author(s)
Ayman N. Ababneh
Abstract
Early age cracking of concrete bridge deck is a frequent problem for bridges
worldwide. This work provides a framework for a thermo-hygro-mechanical
mathematical model for the analysis of early age transverse cracking of the
bridge deck. The model includes the determination of the temperature and
moisture gradients in the deck slab, and the prediction of the thermal and drying
shrinkage strains. These strains were superimposed with the strains from creep
and mechanical loads and applied to an elasto-plastic damage approach to
quantify the damage and stresses in deck slab. The model was implemented in
finite element computer software to accurately predict the cracking and damage
evolution in concrete bridge decks. Accurate prediction of crack tendency is
essential for durability design of bridge decks, thus more sustainable bridges
with increased usable life span and low life-cycle costs.
Keywords: transverse cracking, bridge deck, thermo-hygro-mechanical model.
1 Introduction
Bridges usually developed early cracking of their decks [1]. Early age cracks
usually develop in the transverse direction of the traffic. The cracking could
initiate almost immediately after construction and sometimes appear within a
few months after deck is constructed. The problem of deck cracking is still
significant, even after the adoption of high performance concrete (HPC) for
bridge decks. In a survey conducted by New York Department of Transportation
(NYSDOT), it was observed that 48% of an 84 bridge decks built in New York
State between 1995 and 1998, using HP concrete, have developed transverse
cracks [2].
Figure 1 shows the mechanism of the transverse cracking of a concrete deck
slab. The composite action between the deck and the girders provides restraining
Keywords
transverse cracking, bridge deck, thermo-hygro-mechanical model
Related Book
Other papers in this volume
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