Behavior of Prestressed Beam Strengthened with External Tendons

Miyamoto, Atsushi; Tei, Katsuji; Nakamura, Hideaki; Bull, John W.

doi:10.1061/(asce)0733-9445(2000)126:9(1033)

Cited by 114 publications

(97 citation statements)

References 2 publications

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“…Several researchers [1] tried to predict the loss of prestress force based on a damage index derived from the derivatives of mode shapes without success. Others [2] studied the behaviour of a beam with unbonded tendons, and a formula was proposed for the prediction of the modal frequency for a given prestress force with laboratory and field test verifications. Saiidi et al [3] also reported a study on modal frequency due to the prestress force with laboratory test results.…”

Section: Introductionmentioning

confidence: 99%

Identification of prestress force from measured structural responses

Law

2006

Mechanical Systems and Signal Processing

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Section: Introductionmentioning

confidence: 99%

Identification of prestress force from measured structural responses

Law

2006

Mechanical Systems and Signal Processing

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“…Katsuki et al [3] examined the applicability of GA to interactive truss structure optimization problems. The authors [4] adopted GA for solving a problem of external cable strengthening design and confirmed the effectiveness of GA.…”

Section: Introductionmentioning

confidence: 76%

Application of the island-genetic algorithm to optimal impact resistance design of a RC slab

Miyamoto¹,

Emoto²

2006

WIT Transactions on the Built Environment, Vol 87

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When seeking optimal parameters by numerical analysis in performance-based design, the number of combinations may increase to an extreme level, or objective functions or restrictions may not be accurately formulated. Then, genetic algorithms (GAs) are sometimes used. For certain problems, however, computation takes much time or no effective solutions are obtained even with the use of GAs. To compensate for such shortcomings, this study examines the applicability of island genetic algorithm (island-GA), a type of distributed genetic algorithm, to design problems. Using distributed-GA is expected to lead to efficient application of grid computing. Then, the time of computation may be reduced and networks of computers may be used effectively. The effectiveness of island-GA is verified in optimal impact resistance design for reinforced concrete slabs as an example of design problem.

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“…Investigations demonstrated an increase in the first eigenfrequency from 11.41 Hz for the case of null prestressing force, to 15.07 Hz (?32.1%) for maximum value of prestressing. Miyamoto et al (2000) tested the dynamic behaviour of prestressed beams, strengthened with external tendons. According to their findings, prestressing forces introduced to external tendons, affect the natural frequency of vibration of the girder.…”

Section: Experimental Testsmentioning

confidence: 99%

On the Evaluation of Prestress Loss in PRC Beams by Means of Dynamic Techniques

Breccolotti

2018

Int J Concr Struct Mater

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In the last few decades, prestressing techniques have been used to build very important structures and infrastructures. Since the serviceability and the safety of prestressed reinforced concrete (PRC) elements rely on the effective state of prestressing, development of tools and procedures capable of estimating the effective prestress loss would be very useful. Amongst other techniques, dynamic identification has proved to be an economical, quick and reliable method to evaluate structural integrity. However, the influence of prestressing in the dynamic behavior of PRC elements is not completely clear. In fact, while many references in the literature state that the prestressing force does not affect the frequencies of vibration, almost every experimental test carried out on PRC beams shows an increase in the eigenfrequencies for increasing value of the prestressing force. This paper aims to contribute to the debate, investigating the dynamic behaviour of PRC beams taking into account properties, such as nonlinearity, softening, confinement and micro-cracking of concrete subjected to compression and tension stress states, and the variation of the flexural stiffness of the PRC beam along its length according to bending stress distribution. Non-linear discrete modelling, in combination with system identification and optimization was used to define the dynamic properties of PRC beams, taking into account the effect of prestressing level. The proposed model was applied to four PRC beams with known mechanical and dynamic properties in literature. The influence of the prestressing force on the trend of frequencies of vibration was closely captured for each beam, with errors less than 3% of the estimated frequencies. The results of this investigation thus indicate that dynamic identification techniques can potentially be used to identify the prestressing force level, and consequently the prestress loss, provided the complete concrete mechanics is taken into account.

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Behavior of Prestressed Beam Strengthened with External Tendons

Cited by 114 publications

References 2 publications

Identification of prestress force from measured structural responses

Identification of prestress force from measured structural responses

Application of the island-genetic algorithm to optimal impact resistance design of a RC slab

On the Evaluation of Prestress Loss in PRC Beams by Means of Dynamic Techniques

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