Fatigue Strength in Shear of Prestressed Concrete I-Beams


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Title: Fatigue Strength in Shear of Prestressed Concrete I-Beams

Author(s): Kenneth M. Price and Arthur D. Edwards

Publication: Journal Proceedings

Volume: 68

Issue: 4

Appears on pages(s): 282-292

Keywords: cracking (fracturing); cyclic loads: diagonal tension; fatigue (materials) ; l-beams: post-tensioning;prestressed concrete; reinforced concrete; research ; shear properties; static loads:statistical analysis; stirrups; web reinforcement.

Date: 4/1/1971

The results of static and repeated load shear tests on 17 post-tensioned I-beams, with web reinforcement, are presented. The effect of fatigue on the diagonal cracking strength and the effect of a load history on the subsequent static diagonal cracking strength is reported. The criterion of fatigue failure, in all cases, was found to be stirrup fracture. The number of cycles to first stirrup fracture and the number of cycles to complete beam failure are given for three maximum load values, The minimum load was constant in all tests. The results are summarized in the form of stress cycles-probability curves.