Performance of Strand Splice Repairs in Prestressed Concrete Bridges

Zobel, Robert; Jirsa, James O.

doi:10.15554/pcij.11011998.72.84

Cited by 8 publications

(8 citation statements)

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“… Repaired strands continue to have section loss between 15 and 25% for the 3-sigma population. (15% is based on previous literature recommendations (Harries et al 2012 ; Zobel and Jirsa 1998 ; Gangi et al 2017 ). …”

Section: Methodsmentioning

confidence: 99%

“…Connectivity must be ensured for the sacrificial zinc to protect the strands and/or rebar steel. Moreover, this methodology can be sensitive to fatigue due to the repetitive nature of highway and railroad bridge loading, and they are not recommended when more than 15% of the strands are damaged (Harries et al 2012 ; Zobel and Jirsa 1998 ; Gangi et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…Lastly, vendor charts provide torque values needed to restore tension capacity based on strand grade and size. Strand splicing effectively restores the tensile strength of the strand to a value between 85 and 96% of its original value (85% is recommended as a conservative assumption) (Harries et al 2012 ; Zobel and Jirsa 1998 ; Gangi et al 2017 ). Nevertheless, the designer still makes certain assumptions, leading to uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of structural repairs on the load rating and reliability of a prestressed concrete bridge

Debees

Luleci

Çatbaş

2023

ABEN

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Prestressed girders often deteriorate over time due to environmental and man-made stressors, lowering the strength and serviceability of bridge structures. Although structural repairs are implemented to improve the load carrying capacity of the structure, the presence of numerous unknowns leads to high uncertainty in estimating the adequacy of repairs. For instance, the cross-section of the remaining strands, material properties, applied external loads, and workmanship assumptions made throughout the repair process introduce ambiguities when estimating the adequacy of the repairs. This study evaluates the efficiency of re-tensioning repairs of prestressed concrete bridge span girders. The repairs include field splicing, re-tensioning, of deteriorated or damaged strands by torquing a splicing coupler. The evaluation in this study considers component, system reliability, and load ratings while accounting for several uncertainties, such as structural repair, material properties, and external loads. This paper introduces an approach to account for prestressing strands damage and repair uncertainties while also accounting for other uncertainties. In this regard, five cases are studied: as-built, repaired, and three varying degrees of damage cases. First, the distribution for structural demand and capacity accounting for uncertainty in loads, material properties, and repair process is defined for each girder in the prestressed concrete bridge span. In doing so, Monte-Carlo simulation is employed to determine the distributions. Accordingly, the limit state function of the girders is defined from the obtained distributions. Then, the component reliability of each AASHTO (American Association of State Highway and Transportation Officials) Type II girder is calculated from the obtained reliability indices based on the determined limit state functions. Finally, a system reliability model of the span is developed from the component reliability of each girder. Some advantages and disadvantages of using component and system reliability index versus load rating in damaged and repaired prestressed concrete bridge girders are also discussed. Several critical conclusions are made regarding the uncertainties in structural repair, material properties and external loads, and their impact on the load rating and the component and system reliability of the prestressed concrete bridge structure girders.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of structural repairs on the load rating and reliability of a prestressed concrete bridge

Debees

Luleci

Çatbaş

2023

ABEN

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“…With reference to traditional repair techniques, laboratory investigations by Zobel, Carrasquillo, and Fowler (1997) were conducted to evaluate application methods and performance characteristics of several prepackaged repair materials combined with pressure epoxy injection as well as strand splice assemblies. Under the repetitive nature of highway loading, repair methods such as internal strand splices and external post-tensioning were found to be only partially satisfactory because they could not restore the ultimate strength of the damaged member (Olson, French, and Leon 1992;Zobel and Jirsa 1998). Other studies were conducted on prestressed and nonprestressed concrete deep beams predamaged in shear and strengthened with steel clamping units that acted as external stirrups (Teng et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Repair of Bridge Girders with Composites: Experimental and Analytical Validation

Ludovico

Nanni

Prota

et al. 2005

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This paper deals with a laboratory study to investigate the flexural behavior of full-scale damaged prestressed concrete (PC) bridge girders upgraded with externally bonded carbon fiber-reinforced polymer (CFRP) laminates. The experiments described in the paper concern tests on three beams: one was used as the control beam and the other two, damaged by removing the concrete cover and by cutting two and four strands, respectively, were repaired with CFRP laminates. Analytical predictions compared to tests results in terms of flexural capacity, deflections, strains, and failure modes are discussed. The results indicate that the used upgrade technique is structurally efficient in providing the damaged beams with stiffness and strength very close to that of the original undamaged beam.

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“…In "Evaluation and Repair of Impact-Damaged Prestressed Concrete Bridge Girders", Zobel, Jirsa, Fowler and Carrasquillo (1997) report on the repair of a damaged prestressed concrete beam removed from a railroad bridge in Austin, TX. Companion papers include Jones (1996), Feldman et al (1998), Zobel, Carrasquillo and Fowler (1997, and Zobel and Jirsa (1998). The objective of the beam test program was to study a variety of nondestructive damage assessment techniques, investigate the effectiveness of internal strand splices and to evaluate various patching materials and methods.…”

Section: 2 Beam Testing and Repairmentioning

confidence: 99%

Experimental and analytical assessment of prestressed concrete bridges damaged by overheight vehicle impact

Russo¹

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be f^ any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the auttior dkJ not send UMI a complete manuscript and there are missing pages, tiiese will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overiaps.

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Performance of Strand Splice Repairs in Prestressed Concrete Bridges

Cited by 8 publications

References 0 publications

Effect of structural repairs on the load rating and reliability of a prestressed concrete bridge

Effect of structural repairs on the load rating and reliability of a prestressed concrete bridge

Repair of Bridge Girders with Composites: Experimental and Analytical Validation

Experimental and analytical assessment of prestressed concrete bridges damaged by overheight vehicle impact

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