Effect of concrete strength and longitudinal reinforcement arrangement on the performance of reinforced concrete beams strengthened using EBR and EBROG methods

Sabzi, Javad; Esfahani, M. Reza; Ozbakkaloglu, Togay; Farahi, Behrouz

doi:10.1016/j.engstruct.2019.110072

Cited by 42 publications

(26 citation statements)

References 62 publications

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“…Therefore, improving the ductility of concrete is very important, especially due to the fact that concrete structures may experience extreme loadings during their lifetime [11][12][13][14]. To address such a deficiency, a continuous reinforcing bar has been applied to resist the tensile force imposed on the structure [15][16][17][18]. Unlike continuous reinforcing bars, fibers are short, discontinuous, and randomly distributed throughout the concrete to produce a more ductile and crack control matrix.…”

Section: Introductionmentioning

confidence: 99%

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Gebretsadik

Jadidi

Farhangi

et al. 2021

Eng. Technol. Appl. Sci. Res.

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This study investigates the feasibility of the application of ultrasonic measurement to characterize Steel-Fiber-Reinforced Concrete (SFRC). Specifically, the effects of steel fiber content, age, moisture content, and fiber orientation on Ultrasonic-Pulse-Velocity (UPV) were investigated. In this regard, beam and cylindrical samples were fabricated with different steel fiber contents. The result indicated that for beam specimens the UPV increases with the addition of fiber up to 2% and decreases for higher fiber percentages. Additionally, the fiber orientation within the beam specimens influences the UPV measurements. For cylindrical samples, the rate of UPV decreased with the addition of steel fiber reinforcement. In addition, it was discovered that the curing period affects the magnitude of UPV.

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Section: Introductionmentioning

confidence: 99%

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Gebretsadik

Jadidi

Farhangi

et al. 2021

Eng. Technol. Appl. Sci. Res.

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“…The presented LCC framework is applied to the bridge with eight different design alternatives: status‐quo (SQ) alternative and seven retrofit plans. The retrofit alternatives are selected based on their common usage in Central and Southeastern United States or their effectiveness for seismic damage reduction 27,36–41 . Two of these retrofit alternatives include reinforcing all columns with steel jacketing (SJ) and carbon fiber reinforced polymer (CFRP) wraps.…”

Section: Illustrative Examplementioning

confidence: 99%

“…The retrofit alternatives are selected based on their common usage in Central and Southeastern United States or their effectiveness for seismic damage reduction. 27,[36][37][38][39][40][41] Two of these retrofit alternatives include reinforcing all columns with steel jacketing (SJ) and carbon fiber reinforced polymer (CFRP) wraps. Elastomeric isolation bearings (EIB), steel restrainer cables (SRC), and seat extenders (SEs) are also included in this study.…”

Section: Bridge and Retrofit Alternativesmentioning

confidence: 99%

A Markovian approach to infrastructure life‐cycle analysis: Modeling the interplay of hazard effects and recovery

Dehghani

Fereshtehnejad

Shafieezadeh

2020

Earthq Engng Struct Dyn

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Probabilistic life‐cycle cost (LCC) analysis facilitates optimal management of infrastructure systems under uncertainty. Despite recent advancements, accurate and efficient estimation of the LCC of systems facing risk of exposure to multiple stochastic occurrences of hazards has remained a significant challenge. This paper proposes a Markovian LCC framework that substantially reduces the often very high computational cost of probabilistic LCC analysis especially for large systems. The presented methodology also enhances the accuracy of LCC estimates in multiple fronts. It captures damage accumulations due to incomplete or no repair actions over multiple stochastic hazard exposures in a system's lifetime. Moreover, it tracks the state of infrastructure vulnerability during repair processes and incorporates uncertainties in downtimes associated with damage states of the system. Finally, it estimates the entirity of loss induced by a hazard and avoids the truncation error that exists in annual loss estimates for scenarios where repair downtimes are greater than one year. With these new capabilities, the proposed LCC framework is applied to a bridge in a seismic zone to estimate the LCC and analyze complex interactions of stochastic hazards and their effects with recovery efforts. Results indicate that neglecting effects of damage accumulation and partial improvements in the course of repair can lead to 20% underestimation and 14% overestimation of the expected hazard‐induced LCC, respectively.

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“…They asserted that the maximum load-carrying response of the micropile elements occurs when these types of piles are installed vertically in interaction with competent rock layers. Furthermore, increasing the stiffness of the piles using fiber reinforced polymers enhances the axial and bending capacity of piles in interacting with rock and highly cemented layers, and controls the displacement issues of the piles [16][17][18][19][20][21][22][23][24][25][26][27][28]. Haberfield et al [18] proposed that the satisfactory response of piles depends on the stiffness of the rock and caliche compared to the strength properties of these deposits.…”

Section: Introductionmentioning

confidence: 99%

Effect of Competent Caliche Layers on Measuring the Capacity of Axially Loaded Drilled Shafts Using the Osterberg Test

2020

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This study investigates the effect of the location of an O-cell hydraulic jack along the length of a drilled shaft in a full-scale Osterberg test performed in soils containing layers of caliche. The location of the hydraulic jack with respect to caliche layers influences the measurements obtained from the Osterberg test and the subsequent interpretation of drilled shaft capacity. In this study, drilled shaft capacities were derived utilizing data from 30 Osterberg full-scale field load tests in soils containing caliche layers. The hydraulic jack was placed at the midpoint of the drilled shaft length. Additionally, the Osterberg test data was used to calibrate a numerical model by Plaxis finite element software for drilled shaft analysis. Using the calibrated model, several scenarios of hydraulic jack location were simulated. The scenarios included hydraulic jack locations at several distances above and below a caliche layer. The results of the simulations indicate that in cases where the O-cell was installed far from the caliche layer, the Osterberg tests results showed lower pile resistance capacity compared to the top-down test. However, in cases where the O-cell was installed close to the caliche layers, the Osterberg tests results showed comparable pile resistance capacity compared to the top-down tests. This study recommends installing the hydraulic jack as close as possible to the caliche layers for more reliable interpretation of the Osterberg field tests which leads to a cost-effective design approach by reducing the required shaft length.

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Effect of concrete strength and longitudinal reinforcement arrangement on the performance of reinforced concrete beams strengthened using EBR and EBROG methods

Cited by 42 publications

References 62 publications

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

Application of Ultrasonic Measurements for the Evaluation of Steel Fiber Reinforced Concrete

A Markovian approach to infrastructure life‐cycle analysis: Modeling the interplay of hazard effects and recovery

Effect of Competent Caliche Layers on Measuring the Capacity of Axially Loaded Drilled Shafts Using the Osterberg Test

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