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Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Lee, C. / Shin, S. / Lee, H.

Abstract The compression or tension-controlled failure mode of concrete beams prestressed with unbonded FRP tendons is governed by the relative amount of prestressing tendon to the balanced one. Explicit assessment to determine the balanced reinforcement ratio of a beam with unbonded tendons ( $ρ_{p f b}^{U}$ ) is difficult because it requires a priori knowledge of the deformed beam geometry in order to evaluate the unbonded tendon strain. In this study, a theoretical evaluation of $ρ_{p f b}^{U}$ is presented based on a concept of three equivalent rectangular curvature blocks for simply supported concrete beams internally prestressed with unbonded carbon-fiber-reinforced polymer (CFRP) tendons. The equivalent curvature blocks were iteratively refined to closely simulate beam rotations at the supports, mid-span beam deflection, and member-dependent strain of the unbonded tendon at the ultimate state. The model was verified by comparing its predictions with the test results. Parametric studies were performed to examine the effects of various parameters on $ρ_{p f b}^{U}$ .

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Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Lee, C. / Shin, S. / Lee, H.

Abstract The compression or tension-controlled failure mode of concrete beams prestressed with unbonded FRP tendons is governed by the relative amount of prestressing tendon to the balanced one. Explicit assessment to determine the balanced reinforcement ratio of a beam with unbonded tendons ( $ρ_{p f b}^{U}$ ) is difficult because it requires a priori knowledge of the deformed beam geometry in order to evaluate the unbonded tendon strain. In this study, a theoretical evaluation of $ρ_{p f b}^{U}$ is presented based on a concept of three equivalent rectangular curvature blocks for simply supported concrete beams internally prestressed with unbonded carbon-fiber-reinforced polymer (CFRP) tendons. The equivalent curvature blocks were iteratively refined to closely simulate beam rotations at the supports, mid-span beam deflection, and member-dependent strain of the unbonded tendon at the ultimate state. The model was verified by comparing its predictions with the test results. Parametric studies were performed to examine the effects of various parameters on $ρ_{p f b}^{U}$ .

Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Lee, C. / Shin, S. / Lee, H.

Abstract The compression or tension-controlled failure mode of concrete beams prestressed with unbonded FRP tendons is governed by the relative amount of prestressing tendon to the balanced one. Explicit assessment to determine the balanced reinforcement ratio of a beam with unbonded tendons ( $ρ_{p f b}^{U}$ ) is difficult because it requires a priori knowledge of the deformed beam geometry in order to evaluate the unbonded tendon strain. In this study, a theoretical evaluation of $ρ_{p f b}^{U}$ is presented based on a concept of three equivalent rectangular curvature blocks for simply supported concrete beams internally prestressed with unbonded carbon-fiber-reinforced polymer (CFRP) tendons. The equivalent curvature blocks were iteratively refined to closely simulate beam rotations at the supports, mid-span beam deflection, and member-dependent strain of the unbonded tendon at the ultimate state. The model was verified by comparing its predictions with the test results. Parametric studies were performed to examine the effects of various parameters on $ρ_{p f b}^{U}$ .

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Title:

Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Contributors:

Lee, C. (author) / Shin, S. (author) / Lee, H. (author)

Published in:

International Journal of Concrete Structures and Materials ; 11 ; 1-16

Publication date:

2016-12-27

Size:

16 pages

ISSN:

2234-1315 , 1976-0485

DOI:

https://doi.org/10.1007/s40069-016-0171-6

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

balanced ratio , carbon-fiber-reinforced polymer , modeling , prestressed concrete , unbonded Engineering , Building Materials , Structural Materials , Structural Mechanics , Continuum Mechanics and Mechanics of Materials

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