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A platform for research: civil engineering, architecture and urbanism
Behavior of Untensioned-Bonded Prestressing Strand
The fatigue resistance of the untensioned-bonded prestressing strand in a configuration consistent with the bent strand connection for a precast I-Beam bridges was examined. Two specimen types were tested. The first specimen type (single specimen) had two overlapping strands bent at 90 degrees over a reinforcing bar and cast in a single block of concrete. The opposing strands were gripped and loaded in a near axial condition. The second specimen type (double specimen) consisted of a single strand bent into a U shape with opposing sections of the strand cast in two separate concrete blocks. The load was transferred to the strand through the concrete portion of the specimen. The failure mode for all specimens was determined to be fracture of the strand, therefore test variables were limited to stress range in the strand. An S-N curve was developed for stress range variation from 68.8% to 12.5%. Design recommendations were developed for the bent strand reinforcement in the end connection for resistance to volume change forces in I-Beam bridges.
Behavior of Untensioned-Bonded Prestressing Strand
The fatigue resistance of the untensioned-bonded prestressing strand in a configuration consistent with the bent strand connection for a precast I-Beam bridges was examined. Two specimen types were tested. The first specimen type (single specimen) had two overlapping strands bent at 90 degrees over a reinforcing bar and cast in a single block of concrete. The opposing strands were gripped and loaded in a near axial condition. The second specimen type (double specimen) consisted of a single strand bent into a U shape with opposing sections of the strand cast in two separate concrete blocks. The load was transferred to the strand through the concrete portion of the specimen. The failure mode for all specimens was determined to be fracture of the strand, therefore test variables were limited to stress range in the strand. An S-N curve was developed for stress range variation from 68.8% to 12.5%. Design recommendations were developed for the bent strand reinforcement in the end connection for resistance to volume change forces in I-Beam bridges.
Behavior of Untensioned-Bonded Prestressing Strand
J. R. Salmons (author)
1980
83 pages
Report
No indication
English
| Engineering Index Backfile | 1967
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