Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance of Composite Lightweight Concrete Decks on Steel Stringers
The report presents the results of a field and analytical study into the causes of cracking of lightweight concrete bridge slabs in Louisiana. The field study involved the determination of the present condition of 389 simply supported lightweight concrete bridge slabs built compositely with steel stringers. This included a crack size and distribution study and a determination of reinforcement embedment depth. Available construction records were reviewed, climatic conditions to which the structures had been subjected were studies along with the traffic history of each bridge. The analytical studies attempted to relate design criteria, dynamic behavior of the structure and concrete shrinkage to the present condition of the bridge. Some of the conclusions presented were: There appears to be no reasonable relationship between slab deterioration and most of the variables involved in design and construction. If the concrete cover was less than 3/4 inches, the cracks tended to coincide with reinforcement orientation. If the cover was larger, no relationship between cracks and reinforcement orientation existed. Shrinkage strains as analytically determined are as great as the approximate tensile strength of the concrets. The dynamic behavior analysis pointed to the supposition that for some span length and loading combinations, crack propagation is caused mainly by oscillations due to moving vehicles. (Author)
Performance of Composite Lightweight Concrete Decks on Steel Stringers
The report presents the results of a field and analytical study into the causes of cracking of lightweight concrete bridge slabs in Louisiana. The field study involved the determination of the present condition of 389 simply supported lightweight concrete bridge slabs built compositely with steel stringers. This included a crack size and distribution study and a determination of reinforcement embedment depth. Available construction records were reviewed, climatic conditions to which the structures had been subjected were studies along with the traffic history of each bridge. The analytical studies attempted to relate design criteria, dynamic behavior of the structure and concrete shrinkage to the present condition of the bridge. Some of the conclusions presented were: There appears to be no reasonable relationship between slab deterioration and most of the variables involved in design and construction. If the concrete cover was less than 3/4 inches, the cracks tended to coincide with reinforcement orientation. If the cover was larger, no relationship between cracks and reinforcement orientation existed. Shrinkage strains as analytically determined are as great as the approximate tensile strength of the concrets. The dynamic behavior analysis pointed to the supposition that for some span length and loading combinations, crack propagation is caused mainly by oscillations due to moving vehicles. (Author)
Performance of Composite Lightweight Concrete Decks on Steel Stringers
H. T. Turner (Autor:in) / R. J. Aguilar (Autor:in)
1965
93 pages
Report
Keine Angabe
Englisch
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