United States Department of Transportation
i
Bridge Deck Corner Cracking on Skewed Structures
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2007-06-13
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[PDF-3.09 MB]
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TRIS Online Accession Number:1115041
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Edition:Final Report
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Abstract:This study had a focus on corner cracking in concrete decks of skew highway bridges. A survey of state transportation agencies in the U.S. was conducted on this subject. It found that deck corner cracking in skew bridges is commonly observed. Deck inspection for bridges in Michigan was also performed in this study. Cracking intensity in these decks was viewed as an effect of several possible causal factors, which was collected from 40 bridge decks, including 20 straight and 20 skewed structures. Analysis of the inspection results indicates no clearly agreeable causal relations. Two skew decks were instrumented using temperature and strain sensors for the concrete and the ambient environment. Concrete deck’s temperature and strain response was collected to thermal-, shrinkage,- and truck-wheel-loads. Test results and thereby calibrated finite element analysis results show that the main cause of skew deck corner cracking is cement concrete’s thermal and shrinkage load. Based on current Michigan practice of skew deck design and construction, additional reinforcement in the corner areas is therefore recommended to reduce concrete stresses. Further research is also recommended to develop solutions using optimal combinations of ingredients in concrete and to minimize the constraint between the deck and the supporting superstructure.
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