Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Lee, C.; Shin, So Young; Lee, H.

doi:10.1007/s40069-016-0171-6

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…As a result, the calculation of the balanced reinforcement ratio for beams with unbonded tendons requires further consideration. Lee et al [28] found that the balanced reinforcement ratio of a beam with unbonded tendons ( ) was always smaller than that of a beam with ρ specimens considered in their study.…”

Section: Experimental Results 31 Failure Modesmentioning

confidence: 69%

Flexural behaviour of precast segmental concrete beams internally prestressed with unbonded CFRP tendons under four-point loading

Pham

Hao

et al. 2018

Engineering Structures

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This study investigates the use of carbon fibre reinforced polymer (CFRP) tendons on precast segmental beams (PSBs) to tackle the corrosion problems which are likely to occur at joint locations of PSBs prestressed with steel tendons. Up to date, the use of CFRP tendons was extensively documented for monolithic beams while their application on PSBs has not been reported yet. Three precast segmental T-section beams including two beams with unbonded CFRP and one with steel tendons were built and tested under four-point loads in this study. The test results showed that CFRP tendons can be well used to replace the steel tendons on PSBs. The beams with CFRP tendons demonstrated both high strength and high ductility as compared to the beam with steel tendons. However, the stresses in the unbonded CFRP tendons at ultimate loading conditions of the tested beams were low, ranging from only about 66% to 72% of the nominal breaking tensile strength. The type of joints i.e. dry and epoxied, greatly affects the initial stiffness of the beams but has no effect on the opening of joints at ultimate loading stage. Moreover, a comprehensive examination on four existing code equations to predict the stress in the unbonded tendons showed that the four examined codes predicted well

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Section: Experimental Results 31 Failure Modesmentioning

confidence: 69%

Flexural behaviour of precast segmental concrete beams internally prestressed with unbonded CFRP tendons under four-point loading

Pham

Hao

et al. 2018

Engineering Structures

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“…Heo et al tested the flexural behaviors of the monolithic beam prestressed with the internal unbonded CFRP tendon [24,40], in which the specimens RU50 and RO50 were designed with the same dimensions but different prestressing reinforcement ratios. These two specimens are employed here to verify the effectiveness of the proposed model for the simulation of internal unbonded tendons.…”

Section: Verification For Tests Of Monolithic Beam Prestressed With I...mentioning

confidence: 99%

Numerical Model for Flexural Analysis of Precast Segmental Concrete Beam with Internal Unbonded CFRP Tendons

et al. 2022

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A new construction scheme was recently developed for precast segmental concrete beams by replacing steel tendons with internal unbonded carbon-fiber-reinforced polymer tendons. The discontinuous behaviors of the opening joints and unbonded phenomenon of tendons made their flexural behaviors more complicated than those of monolithic beams and members with bonded tendons. Currently, the knowledge on the structural performance of precast segmental concrete beams with internal unbonded carbon-fiber-reinforced polymer tendons is still limited. An efficient numerical model is urgently needed for the structural analysis and performance evaluation of this new construction scheme. In this paper, a new beam–cable hybrid model was proposed accounting for the mechanical behaviors of open joints and unbonded tendons. The numerical model was implemented in the OpenSees software with the proposed modeling method for joint elements and a newly developed element class for internal unbonded tendons. The effectiveness of the proposed model was verified by comparisons against two simply supported experimental tests. Then, the numerical model was employed to evaluate the flexural performance of a full-scale bridge with a span of 37.5 m. Compared with the precast segmental concrete beam with external steel tendons, the scheme with internal unbonded carbon-fiber-reinforced polymer tendons significantly improved the flexural capacity and ductility by almost 54.6% and 8.9%, respectively. The span-to-depth ratio and prestressing reinforcement ratio were the main factors affecting the flexural behaviors. With the span-to-depth ratio increasing by 23%, the flexural capacity decreased by approximately 38.6% and the tendon stress increment decreased by approximately 15.7%. With the prestressing reinforcement ratio increasing by 65.4%, the flexural capacity increased by 88.7% and the tendon stress increment decreased by approximately 25.2%.

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“…The application of prestressed CFRP tendons to SRC structures could greatly improve their crack resistance and minimize their deflection under service loads while providing additional rigidity. Extensive works have been carried out on the bending behaviour of prestressed CFRP tendon steel reinforced concrete (PSRC) members [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical studies on steel-reinforced concrete composite members with bonded prestressed CFRP tendon under eccentric tension

Deng

Shen

Zhang

et al. 2021

Composite Structures

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Balanced Ratio of Concrete Beams Internally Prestressed with Unbonded CFRP Tendons

Cited by 12 publications

References 13 publications

Flexural behaviour of precast segmental concrete beams internally prestressed with unbonded CFRP tendons under four-point loading

Flexural behaviour of precast segmental concrete beams internally prestressed with unbonded CFRP tendons under four-point loading

Numerical Model for Flexural Analysis of Precast Segmental Concrete Beam with Internal Unbonded CFRP Tendons

Experimental and analytical studies on steel-reinforced concrete composite members with bonded prestressed CFRP tendon under eccentric tension

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