Simulating RC beams with unbonded FRP and steel prestressing tendons

Knight, D.; Visintin, Phillip; Oehlers, Deric J.; Ali, M.S. Mohamed

doi:10.1016/j.compositesb.2013.12.039

Cited by 26 publications

(13 citation statements)

References 26 publications

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“…In light of this, it is proposed that the moment-rotation (M/h) technique [17][18][19][20][21][22][23] be applied to derive the required M/v relationships. The M/h technique applies the partial interaction theory [24][25][26] in order to simulate flexural cracking and tension stiffening by directly simulating the slip of reinforcements in the RC beam.…”

Section: Objectivementioning

confidence: 99%

Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements

Shukri

Jumaat

2016

Construction and Building Materials

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Section: Objectivementioning

confidence: 99%

Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements

Shukri

Jumaat

2016

Construction and Building Materials

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“…Bonded FRP tendons may lead to rupture failure of the beams [3,4], while the use of unbonded tendons is an effective and economical solution to prevent FRP rupture [5]. Extensive studies have been conducted to assess the short-term behavior of concrete beams with internal [5][6][7][8] or external [9][10][11][12][13] unbonded FRP tendons.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons

Lou

Karavasilis

2018

Composite Structures

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This paper presents the assessment of the time-dependent behavior and the prediction of the long-term deflection of concrete beams prestressed with internal unbonded carbon fiber reinforced polymer (CFRP) tendons. A numerical model for the time-dependent analysis of concrete beams prestressed with unbonded tendons is calibrated against experimental results. Parametric numerical simulations are then conducted on simply supported unbonded prestressed concrete beams subjected to long-term sustained loads to investigate the effect of using CFRP tendons instead of low-relaxation steel ones, the magnitude of the initial prestress, the loading conditions, and the quantity of the compressive reinforcing steel. The results show that the long-term prestress loss of beams with CFRP tendons is considerably higher than that of beams with steel tendons. Moreover, it is shown that increasing the quantity of compressive reinforcing steel leads to a substantial decrease in long-term downward deflection. A modification of the ACI 318-14 equation is proposed to predict the time-dependent deflection of prestressed concrete beams with unbonded FRP or steel tendons.

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“…The limitations imposed by empirically derived values prompted a new analysis approach to be introduced [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. This new analysis approach aims to simulate the mechanics of RC beams, as seen in practice, such as concrete cracking, crack widening and formation of concrete wedges.…”

Section: Introductionmentioning

confidence: 99%

“…This new analysis approach aims to simulate the mechanics of RC beams, as seen in practice, such as concrete cracking, crack widening and formation of concrete wedges. This is done through the application of numerical analysis based on the partial interaction theory [ 14 , 17 , 18 , 19 ], which enables this new analysis approach to directly incorporate any bond-slip relationship, thereby removing the dependency on the empirical factors to indirectly simulate the mechanics of RC beams as seen in practice. However, it should be noted that while no portion of the mechanics is based on empiricisms, empiricisms are still required in terms of material properties, such as stress-strain relationships and bond-slip relationships.…”

Section: Introductionmentioning

confidence: 99%

The Tension-Stiffening Contribution of NSM CFRP to the Behavior of Strengthened RC Beams

2015

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Tension stiffening is a characteristic behavior of reinforced concrete (RC) beams which is directly affected by the bond-slip property of steel bar and concrete interfaces. A beam strengthened with a near-surface mounted (NSM) technique would be even more affected by tension stiffening, as the NSM reinforcement also possess a bond-slip property. Yet assessing how much the tension stiffening of NSM contributes to the behavior of RC beams is difficult due to the fact that bond-slip effects cannot be directly incorporated into a strain-based moment-curvature analysis. As such, the tension stiffening is typically incorporated through various empirical formulations, which can require a great deal of testing and calibrations to be done. In this paper a relatively new method, which can be called the mechanics-based segmental approach, is used to directly simulate the tension stiffening effect of NSM reinforcements on RC beams, without the need for empirical formulations to indirectly simulate the tension stiffening. Analysis shows that the tension stiffening of NSM fiber reinforced polymer (FRP) contributes a significant portion to the stiffness and strength of the strengthened RC beam not only during serviceability, but at all load levels.

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Simulating RC beams with unbonded FRP and steel prestressing tendons

Cited by 26 publications

References 26 publications

Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements

Simulating concrete cover separation in RC beams strengthened with near-surface mounted reinforcements

Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons

The Tension-Stiffening Contribution of NSM CFRP to the Behavior of Strengthened RC Beams

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