Bond fatigue tests of beams simulating pretensioned concrete crossties

Kaar, Paul H.; Hanson, Norman W.

doi:10.15554/pcij.09011975.65.80

Cited by 13 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Kaar and Hanson used 95 percent of the maximum strain in their transfer and development length study for pre tensioned concrete railroad ties. 8 Overall, the 95 Percent Average Maximum Strain (95 percent AMS) method represents an accurate value for determining the transfer length. If on the one hand, the reported transfer lengths are too short because only 95 percent of the maximum strain is used to define transfer length, then it must also be recognized that the use of me chanical strain gauges combined with the technique of "smoothing" the data artificially lengthens the measured transfer lengths.…”

Section: Discussionmentioning

confidence: 99%

Measured Transfer Lengths of 0.5 and 0.6 in. Strands in Pretensioned Concrete

Russell¹,

Burns²

1996

pcij

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Measured Transfer Lengths of 0.5 and 0.6 in. Strands in Pretensioned Concrete

Russell¹,

Burns²

1996

pcij

View full text Add to dashboard Cite

“…(Ghosh and Fintel, 1986;Mitchell et al, 1993;Roller et al, 1995), 단부균열에 대한 보강에 관한 연구 (Marshall, 1966;Marshall and Mattok, 1962;Nawy and Huang, 1977;Mirza and Tawfik, 1978) 그리고 프리텐션 부재의 피로와 내구성에 관한 연구 (Kaar et al, 1975;Boshore, 1965;Rabbat et al, 1979;Russell and Burns, 1994 3개 또는 7가닥 강선으로 된 프리텐션용 강연선은 위험단면을 지나 다음의 정착 길이 이상으로 부착되어야 한다.…”

Section: Fig 1 Concept Of Pretension Systemunclassified

A Structural Performance Test of a Full-scale Pretension PSC Girder

Kim

2013

Journal of the Korean Society of Civil Engineers

View full text Add to dashboard Cite

The main purpose of this study is to investigate the static behavior of a prestressed concrete (PSC) girder using pre-tension method. A 30m long full-scale pretension PSC girder is fabricated by the portable fabrication system and tested. All results have been compared to those obtained from F.E.A results. Deflections at the middle of girders have been measured for evaluation. Also, strains of concrete at the middle of span have been measured. From the results of experimental, the load when initial crack was developed was obtained to be 1.75 time the unfactered design load in the full-scale girder specimen. Also, the data of specimen are satisfied the desgin requirements of ductility on the Korea Bridge Design Specification(2010). In service state, the vertical deflection at center of test specimen when a initial crack was developed is satisfied the vertical deflection requirement under live load of the Korea Bridge Design Specification(2010). To verify the experimental results, we numerical analyze the test and confirmed that the data were similar with results from the test above. The pretension girder fabricated in site were found to have enough stregnth for safety under and after construction.

show abstract

“…Failure is associated with loss of bond. 3 In the Anchorage, AK earthquake, several buildings collapsed when the shear connectors between precast elements failed in shear and bond under a very few intense cycles. Reinforced concrete columns in the Caracas, Venezuela earthquake similarly failed under cyclic shear loads.…”

Section: Selected Relevant Experiencementioning

confidence: 99%

“…Our concerns for the safety of concrete sea structures under cyclic loading are fourfold: (1) to prevent a fatigue failure of the structure under postulated long-term environmental conditions over the service life, (2) to prevent low-cycle fatigue failure due to a few cycles of loads higher than the design value because of environmental forces greater than those assumed in design, (3) to ensure that at any stage of the structure's service life, it must be able safely to withstand the design storm, and (4) to ensure that after cracking due to accident, overload, thermal strains, or construction procedure, the structure can withstand the long-term environmental conditions and/or the extreme storm condition.…”

Section: Introductionmentioning

confidence: 99%

High- and Low-Cycle Fatigue Behavior of Prestressed Concrete in Offshore Structures

Gerwick¹,

Venuti

1980

Society of Petroleum Engineers Journal

View full text Add to dashboard Cite

The expanding use of prestressed concrete in offshore structures, both fixed and floating, in increasingly hostile environments has generated intense interest in its fatigue endurance capabilities, even though no known fatigue problems have arisen in actual structures. Although concrete does suffer progressive loss of strength with increasing number of cycles, a comparison of the Wohler curves developed on the basis of laboratory tests with the probable distribution of compressive stresses during a service life in an environment such as the North Sea shows extremely low cumulative usage at the highcycle end of the spectrum. However, significant damage can occur at the low-cycle, high-amplitude end of the spectrum under a relatively small number of cycles of very high magnitude. This damage is displayed by a reduction in stiffness and by rapidly increasing axial and lateral strains that lead to cracking and spalling.Repeated cycling into high compressive ranges causes a substantial increase in creep, reducing the effective prestress. Confining reinforcement resists lateral deformation and delays compressive fatigue failure. Cycling into the tensile range a large number of times can produce cracking due to tensile fatigue at about half the static tensile strength. Cracking also can occur due to overload, accident, construction procedures, and thermal strains. Repeated excursions of submerged concrete into the crack-opening range leads to pumping of water in and out of the crack and hydraulic wedging, leading to concrete splitting.Cracking subjects the reinforced and prestressed steel to cyclic tension. Loss of bond ensues and may lead to eventual fatigue failure. Adequate endurance can be ensured by prestressing to avoid a large number of cycles extending into the crack -opening range and by providing adequate percentages of steel

show abstract

Bond fatigue tests of beams simulating pretensioned concrete crossties

Cited by 13 publications

References 2 publications

Measured Transfer Lengths of 0.5 and 0.6 in. Strands in Pretensioned Concrete

Measured Transfer Lengths of 0.5 and 0.6 in. Strands in Pretensioned Concrete

A Structural Performance Test of a Full-scale Pretension PSC Girder

High- and Low-Cycle Fatigue Behavior of Prestressed Concrete in Offshore Structures

Contact Info

Product

Resources

About