A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Use of Precast, Prestressed Concrete for Bridge Decks
A pretensioned concrete slab 4 feet wide by 6 inches deep and long enough to provide a 32-foot roadway surface between center lines of exterior beams was proposed as the basic element in constructing a precast concrete bridge deck. After positioning a sufficient number of slabs, edge to edge, on the steel framework until the desired roadway length was reached, the slabs would be drawn together to act as a unit by means of post-tensioning tendons. To test the feasibility of this method, four unreinforced concrete slabs 24 inches wide by 6 inches deep and 34 inches long with keyways cast into their edges were assembled on a beam, post-tensioned by means of a 3/8-inch diameter cable, and subjected to a concentrated load. In addition, a photo-elastic stress study of various keyway configurations was made, various joint materials were investigated for use between slabs, a steel clip and bolt assembly similar to that employed by the Association of American Railroads to fasten rails to prestressed concrete ties was proposed for attaching the floor slabs to the top flanges of the bridge beams, and a cost estimate of using this particular method of deck construction over conventional methods was prepared. (BPR abstract)
Use of Precast, Prestressed Concrete for Bridge Decks
A pretensioned concrete slab 4 feet wide by 6 inches deep and long enough to provide a 32-foot roadway surface between center lines of exterior beams was proposed as the basic element in constructing a precast concrete bridge deck. After positioning a sufficient number of slabs, edge to edge, on the steel framework until the desired roadway length was reached, the slabs would be drawn together to act as a unit by means of post-tensioning tendons. To test the feasibility of this method, four unreinforced concrete slabs 24 inches wide by 6 inches deep and 34 inches long with keyways cast into their edges were assembled on a beam, post-tensioned by means of a 3/8-inch diameter cable, and subjected to a concentrated load. In addition, a photo-elastic stress study of various keyway configurations was made, various joint materials were investigated for use between slabs, a steel clip and bolt assembly similar to that employed by the Association of American Railroads to fasten rails to prestressed concrete ties was proposed for attaching the floor slabs to the top flanges of the bridge beams, and a cost estimate of using this particular method of deck construction over conventional methods was prepared. (BPR abstract)
Use of Precast, Prestressed Concrete for Bridge Decks
M. J. Gutzwiller (author) / R. H. Lee (author) / C. F. Scholer (author)
1968
47 pages
Report
No indication
English
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