A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fretting Fatigue in Post-Tensioned Concrete
The report summarizes an experimental investigation of fatigue strength of post-tensioned concrete girders. The test series included strand-in-air tests to characterize the prestressing strands utilized, reduced beam specimens with single strands in a tendon, reduced beam specimens with multiple strands in a tendon, and complete beams with multiple strands in a tendon. The variables explored included the effect of stress range, type of duct material, lateral contact force per unit length, and type of strand. Duct materials included both metallic and plastic sheaths. Both epoxy coated and uncoated strands were used. All specimens were tested in a cracked condition and fatigue failures occurred in the regions of high curvature (and hence high lateral force) in the vicinity of cracks. The results indicate that the expected fatigue life of prestressing strand as determined from strand-in-air tests can be substantially reduced in post-tensioned concrete applications due to fretting fatigue of the prestressing tendon. Such fretting fatigue can occur in cracked concrete sections at locations of tendon curvature.
Fretting Fatigue in Post-Tensioned Concrete
The report summarizes an experimental investigation of fatigue strength of post-tensioned concrete girders. The test series included strand-in-air tests to characterize the prestressing strands utilized, reduced beam specimens with single strands in a tendon, reduced beam specimens with multiple strands in a tendon, and complete beams with multiple strands in a tendon. The variables explored included the effect of stress range, type of duct material, lateral contact force per unit length, and type of strand. Duct materials included both metallic and plastic sheaths. Both epoxy coated and uncoated strands were used. All specimens were tested in a cracked condition and fatigue failures occurred in the regions of high curvature (and hence high lateral force) in the vicinity of cracks. The results indicate that the expected fatigue life of prestressing strand as determined from strand-in-air tests can be substantially reduced in post-tensioned concrete applications due to fretting fatigue of the prestressing tendon. Such fretting fatigue can occur in cracked concrete sections at locations of tendon curvature.
Fretting Fatigue in Post-Tensioned Concrete
G. P. Wollmann (author) / D. L. Yates (author) / J. E. Breen (author) / M. E. Kreger (author)
1988
162 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Highway Engineering , Materials Degradation & Fouling , Fretting , Fatigue strength at N cycles , Post tensioning , Girders , Concretes , Mechanical properties , Fatigue life , Fatigue(Materials) , Structural forms , Strands , Fatigue tests , Bridges(Structures) , Concrete structures , Cracking(Fracturing)
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