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

Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons
Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons
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.
0263-8223
365-376
Lou, Tiejiong
2d99cbfa-37a0-49c3-a033-38e1dd580ab6
Karavasilis, Theodore
15850eb0-6af4-4b6e-bab4-d5bde281b769
Lou, Tiejiong
2d99cbfa-37a0-49c3-a033-38e1dd580ab6
Karavasilis, Theodore
15850eb0-6af4-4b6e-bab4-d5bde281b769

Lou, Tiejiong and Karavasilis, Theodore (2018) Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons. Composite Structures, 194, 365-376. (doi:10.1016/j.compstruct.2018.04.013).

Record type: Article

Abstract

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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Accepted/In Press date: 2 April 2018
e-pub ahead of print date: 3 April 2018
Published date: 15 June 2018

Identifiers

Local EPrints ID: 419437
URI: http://eprints.soton.ac.uk/id/eprint/419437
ISSN: 0263-8223
PURE UUID: dd1a229d-df0c-4add-b0ad-4eb5aa16b206
ORCID for Tiejiong Lou: ORCID iD orcid.org/0000-0001-9150-1203
ORCID for Theodore Karavasilis: ORCID iD orcid.org/0000-0003-2553-5389

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Date deposited: 12 Apr 2018 16:30
Last modified: 16 Mar 2024 06:28

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Contributors

Author: Tiejiong Lou ORCID iD
Author: Theodore Karavasilis ORCID iD

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