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International Conference on Advances in Computational Mechanics

ACOME 2017: Proceedings of the International Conference on Advances in Computational Mechanics 2017 pp 273–289Cite as

Flexural Behavior of Unbonded Post-Tensioned Concrete T-Beams Externally Bonded With CFRP Sheets Under Static Loading

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Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

This paper presents a study on flexural behavior of unbonded post-tensioned concrete T-beams (UPC) externally strengthened by CFRP sheets under static loading with or without the presence of U-strip CFRP anchorage systems. A total of nine UPC T-beams in large size including one control unstrengthened beam and eight beams externally strengthened with varied number of CFRP sheets (2, 4, and 6 plies) were tested. Two types of transverse CFRP U-strip anchorage system were also retrofitted in the shear span. The results showed that CFRP sheets significantly increased the flexural capacity (up to 37%), decreased deflection in serviceability state, improved ductility, and reduced crack width (up to 48%) of the tested beams. The maximum strain in CFRP sheets in strengthened UPC T-beams ranged from 38.7 to 69.3% of the rupture strain of the CFRP sheets and tended to decrease with a large number of CFRP sheets. Strain in tendons of strengthened beams was significantly affected by the CFRP sheets and transverse U-strip anchorage system.

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Abbreviations

AN1:

U-strip anchorage system with one 300-mm-wide strip and three 100-mm-wide strips installed within the distance of L/4 = 1350 mm from each end of CFRP sheet

AN2:

U-strip anchorage system with six 100-mm-wide strips evenly spaced within the distance of L/4 = 1350 mm from each end of CFRP sheet

an :

number of CFRP U-strip 100-mm-wide anchorage

a cr,exp :

crack width of tested beam, mm

a cr,u,CFRP :

maximum crack width of FRP-strengthened beam, mm

a cr,u,0 :

maximum crack width of the control beam, mm

t f :

thickness of one ply of the CFRP sheet, mm

a cr,CFRP :

crack width of FRP-strengthened beam, mm

a f :

width of the CFRP reinforcing plies, mm

n :

number of plies of CFRP sheet

s f :

spacing of CFRP U-strip, mm

w f :

width of CFRP U-strip anchors, mm

P cr,exp :

cracking load of test beam, kN

P exp :

test load, kN

P u,0,exp :

ultimate load of the control beam, kN

P u,exp :

ultimate load of test beam, kN

δ u,exp :

maximum displacement at midspan of test beam, mm

δ exp,mid :

displacement at midspan of test beam, mm

ε ten,u,mid :

maximum tensile strain in unbonded tendon at midspan, ‰

δ u,0 :

maximum displacement at midspan of the control beam, mm

ε cu :

maximum concrete strain, ‰

ε CFRP :

tensile strain in CFRP sheets, ‰

ε su :

maximum tensile strain in non-prestressed reinforcement at the ultimate load, ‰

ε fu,end :

maximum tensile strain in CFRP sheets at the ends of the bond length, ‰

ε fu,L/3 :

maximum tensile strain in CFRP sheets of test beam at the loading locations, ‰

ε fu,mid :

maximum tensile strain in CFRP sheets of test beam at midspan, ‰

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Acknowledgements

This research was funded by Dong Thap province’s Department of Science and Technology and Department of Transport.

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Authors and Affiliations

  1. Faculty of Civil Engineering, Van Lang University, Ho Chi Minh City, Vietnam

    Q. P. T. Truong

  2. Faculty of Civil & Electrical Engineering, Open University, Ho Chi Minh City, Vietnam

    P. Phan-Vu

  3. Faculty of Civil Engineering, HCMC University of Technology, Ho Chi Minh City, Vietnam

    D. Tran-Thanh, T. D. Dang & L. Nguyen-Minh

Authors
  1. Q. P. T. Truong
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  2. P. Phan-Vu
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  3. D. Tran-Thanh
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  4. T. D. Dang
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  5. L. Nguyen-Minh
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Corresponding author

Correspondence to L. Nguyen-Minh .

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Editors and Affiliations

  1. CIR Technology, Ho Chi Minh City University of Technology, Ho Chi Minh, Vietnam

    Hung Nguyen-Xuan

  2. Faculty of Engineering and Architecture, Ghent University, Ghent, Belgium

    Phuc Phung-Van

  3. Computational Mechanics, Bauhaus-University Weimar, Weimar, Germany

    Timon Rabczuk

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Truong, Q.P.T., Phan-Vu, P., Tran-Thanh, D., Dang, T.D., Nguyen-Minh, L. (2018). Flexural Behavior of Unbonded Post-Tensioned Concrete T-Beams Externally Bonded With CFRP Sheets Under Static Loading. In: Nguyen-Xuan, H., Phung-Van, P., Rabczuk, T. (eds) Proceedings of the International Conference on Advances in Computational Mechanics 2017. ACOME 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7149-2_19

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  • DOI: https://doi.org/10.1007/978-981-10-7149-2_19

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-10-7148-5

  • Online ISBN: 978-981-10-7149-2

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