Comparison of details for controlling end-region cracks in precast, pretensioned concrete I-girders

Ross, Brandon E.; Willis, Michael D.; Hamilton, H. R.; Consolazio, Gary R.

doi:10.15554/pcij.03012014.96.108

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Although anchoring through the adhesion of tendons has a positive effect on the distribution of stresses, stress accumulations still occur at the ends of the elements. Typical damage includes splitting [20,21] of concrete around the tendons, caused mainly by the increase in diameter by the tendons that were destressed at the moment of release [22,23], and spalling of concrete caused by transverse tension between the tendons [24]. Both of these types of damage are prevented by introducing transverse reinforcement, most often in the form of stirrups thickened at the ends of the beams.…”

Section: Incorrect Construction Of Reinforcementmentioning

confidence: 99%

Common Defects of Prefabricated Prestressed Elements for Industrial Construction

Krzywoń,

Hulimka

2024

Buildings

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This manuscript attempts to classify typical errors occurring during the design, production, and use of prefabricated and prestressed concrete girders and slabs manufactured in Poland for industrial buildings since the 1950s. Although the cases discussed concern Poland, most of them have a universal character, and as such are also found in other countries. The defects and errors are illustrated with examples and the causes of their occurrence are also discussed. A method of classifying flaws based on the period of their occurrence was proposed. Most of the examples discussed were encountered by the authors during their professional work. In most of the presented cases, repair was possible, enabling further safe operation. This paper shows how important it is to periodically check the technical condition of prestressed structures and how common and at the same time trivial mistakes may be made by designers and contractors of this type of structure, despite the experience of over 70 years of their mass use. The quality of modern prestressed structures is undoubtedly higher. Using the experience of previous generations, designers and contractors abandoned the less durable post-tensioned concrete lattice girders. Errors, if they appear, are most often at the stage of implementing new products or are the result of poor workmanship or disregard for unfavorable weather conditions.

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Section: Incorrect Construction Of Reinforcementmentioning

confidence: 99%

Common Defects of Prefabricated Prestressed Elements for Industrial Construction

Krzywoń,

Hulimka

2024

Buildings

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“…It was founded around the 1960s; horizontal cracks occur in the pretensioned member ends, Marshall and Mattock (12) investigated with an experimental study. After that, multiple researchers have done analytical studies (such as the Gergely-Sozen model, strut-and-tie models, and nonlinear finite element analysis) and experimental studies to realize the end-zone stresses or to design the end-zone reinforcements (5)(6)(7)(8)11,(13)(14)(15)(16)(17)(18) .…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the temporal changes of the principal stresses at the ends of the hollow PC-girders to control horizontal end cracks

Karimi¹,

Uchida²,

Aasim³

et al. 2021

IJST

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“…Also, efforts have been made to improve the predictive equations provided for bursting force among several design equations for the anchorage zone presented in AASHTO [5][6][7]. On the other hand, a large portion of the previous studies focused on improving the details of end-region reinforcements that can effectively control the cracks [8][9][10][11][12][13]. Investigation on the stress distribution at the anchorage zone is also important when developing new types of anchorage devices provided for the tendons made of advanced materials such as fiber reinforced polymer (FRP) [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

An Improved Equation for Predicting Compressive Stress in Posttensioned Anchorage Zone

Park¹,

Kim

Park³

et al. 2020

Advances in Civil Engineering

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Validity of the approximate equation for predicting compressive stress in the posttensioned anchorage zone presented in the AASHTO LRFD Bridge Design Specifications was investigated in this study. Numerical analysis based on the finite element method (FEM) and theoretical analysis showed that the AASHTO formula gives relatively accurate stress values when the effect of duct holes is neglected. However, it was found that the formula can significantly overestimate the stresses in the actual prestressed concrete member with spaces occupied by ducts. Therefore, an improved equation was proposed for the existing AASHTO equation to consider the effect of the duct holes on the stress distribution. This resulted in relatively accurate prediction of the distribution and magnitude of the compressive stresses even with the presence of the duct holes. The proposed equation was also validated by comparing with the stresses measured in the test of a posttensioned full-scale specimen. This study is expected to contribute to the design of the anchorage zone in prestressed concrete structures by suggesting a more reasonable way to assess the appropriateness of anchorage devices.

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Comparison of details for controlling end-region cracks in precast, pretensioned concrete I-girders

Cited by 8 publications

References 4 publications

Common Defects of Prefabricated Prestressed Elements for Industrial Construction

Common Defects of Prefabricated Prestressed Elements for Industrial Construction

Numerical study on the temporal changes of the principal stresses at the ends of the hollow PC-girders to control horizontal end cracks

An Improved Equation for Predicting Compressive Stress in Posttensioned Anchorage Zone

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