Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Case Study of Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Correlation of Field Tests and Numerical Results
Cracking at the top of bridge decks exposes the top mat of reinforcing bars to chloride attack, which is a major cause of the deterioration of bridge decks. The top mat of reinforcement is required by the current AASHTO design code, in which the influence of girder flexibility on deck behavior is not considered. However, it has been observed that girder deflection reduces the tensile stresses developed at the top of bridge decks. As a results, the need for top reinforcing bars is questionable. To explore the possibility of eliminating top reinforcing bars and, thereby, reducing the vulnerability to deterioration, the behavior of a four-span highway bridge is being investigated. The response of the deck under general truck loads has been analyzed with the validated numerical model, and the numerical results show that the tensile stresses developed at the top of the deck always tend to be much less than the modulus of rupture of the deck concrete. This study confirms the feasibility of eliminating most of the top reinforcement in bridge decks.
Case Study of Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Correlation of Field Tests and Numerical Results
Cracking at the top of bridge decks exposes the top mat of reinforcing bars to chloride attack, which is a major cause of the deterioration of bridge decks. The top mat of reinforcement is required by the current AASHTO design code, in which the influence of girder flexibility on deck behavior is not considered. However, it has been observed that girder deflection reduces the tensile stresses developed at the top of bridge decks. As a results, the need for top reinforcing bars is questionable. To explore the possibility of eliminating top reinforcing bars and, thereby, reducing the vulnerability to deterioration, the behavior of a four-span highway bridge is being investigated. The response of the deck under general truck loads has been analyzed with the validated numerical model, and the numerical results show that the tensile stresses developed at the top of the deck always tend to be much less than the modulus of rupture of the deck concrete. This study confirms the feasibility of eliminating most of the top reinforcement in bridge decks.
Case Study of Concrete Deck Behavior in a Four-Span Prestressed Girder Bridge: Correlation of Field Tests and Numerical Results
L. Cao (Autor:in) / J. H. Allen (Autor:in) / P. B. Shing (Autor:in) / D. Woodham (Autor:in)
1994
113 pages
Report
Keine Angabe
Englisch
Highway Engineering , Construction Equipment, Materials, & Supplies , Corrosion & Corrosion Inhibition , Prestressed concrete , Case studies , Girder bridges , Corrosion , Concrete structures , Loads(Forces) , Strain gages , Tensile properties , Finite element method , Girders , Reinforcing materials , Bridge design , Field tests , Highway bridges , Bridge maintenance , Design standards , Specifications , Cracking(Fracturing)
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