Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain

Dhannyanto Anggawidjaja; Tamon Ueda; Jianguo Dai; Hiroshi Nakai

doi:10.1016/j.cemconcomp.2006.07.011

Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain

Dhannyanto Anggawidjaja
, Tamon Ueda^*
, Jianguo Dai
, Hiroshi Nakai

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

130 Citations (Scopus)

Abstract

One of the major drawbacks of structure strengthening by fiber reinforced polymer wrapping using materials such as CFRP and AFRP, whose strength and stiffness are high, is the brittle nature of failure mode, which is caused by fracture of the fiber due to low fracturing strain. A series of experiments were conducted to investigate the efficiency of using two new types of fibers, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) fiber, for seismic strengthening of RC piers. These fibers have the properties of low stiffness and high fracturing strain. Specimens strengthened by PET and PEN fiber sheets wrapping showed considerable improvement in shear capacity and ductility compared to the control specimen. Both PET and PEN showed no tendency to fiber breakage before the pre-defined ultimate deformation. Pier behaviors such as shear deformation and strain development in both fiber and steel shear reinforcement, and the piers, ultimate failure modes, were carefully examined. Shear deformation increases rather rapidly after peak load and concrete shear capacity decreases with the increase in shear deformation. Stiffness of fiber affects the development of shear deformation and the descending branch of the load-deformation curve after the peak load. A simple model to predict the piers deformation capacity, based on the experimental results, was proposed. © 2006 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	914-927
Number of pages	14
Journal	Cement and Concrete Composites
Volume	28
Issue number	10
Online published	25 Sept 2006
DOIs	https://doi.org/10.1016/j.cemconcomp.2006.07.011
Publication status	Published - Nov 2006
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The fiber sheet material and experimental program was sponsored by the Aramid Retrofitting System Association as part of an effort to develop new fiber material for seismic strengthening. The major part of the experimental work was carried out at Mitsui-Sumitomo Research Institute in Tochigi. The assistance from the technical staff there is greatly appreciated.

Research Keywords

Ductility
High fracturing strain
PEN
PET
Shear
Wrapping

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abstract = "One of the major drawbacks of structure strengthening by fiber reinforced polymer wrapping using materials such as CFRP and AFRP, whose strength and stiffness are high, is the brittle nature of failure mode, which is caused by fracture of the fiber due to low fracturing strain. A series of experiments were conducted to investigate the efficiency of using two new types of fibers, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) fiber, for seismic strengthening of RC piers. These fibers have the properties of low stiffness and high fracturing strain. Specimens strengthened by PET and PEN fiber sheets wrapping showed considerable improvement in shear capacity and ductility compared to the control specimen. Both PET and PEN showed no tendency to fiber breakage before the pre-defined ultimate deformation. Pier behaviors such as shear deformation and strain development in both fiber and steel shear reinforcement, and the piers, ultimate failure modes, were carefully examined. Shear deformation increases rather rapidly after peak load and concrete shear capacity decreases with the increase in shear deformation. Stiffness of fiber affects the development of shear deformation and the descending branch of the load-deformation curve after the peak load. A simple model to predict the piers deformation capacity, based on the experimental results, was proposed. {\textcopyright} 2006 Elsevier Ltd. All rights reserved.",

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AU - Ueda, Tamon

AU - Dai, Jianguo

AU - Nakai, Hiroshi

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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N2 - One of the major drawbacks of structure strengthening by fiber reinforced polymer wrapping using materials such as CFRP and AFRP, whose strength and stiffness are high, is the brittle nature of failure mode, which is caused by fracture of the fiber due to low fracturing strain. A series of experiments were conducted to investigate the efficiency of using two new types of fibers, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) fiber, for seismic strengthening of RC piers. These fibers have the properties of low stiffness and high fracturing strain. Specimens strengthened by PET and PEN fiber sheets wrapping showed considerable improvement in shear capacity and ductility compared to the control specimen. Both PET and PEN showed no tendency to fiber breakage before the pre-defined ultimate deformation. Pier behaviors such as shear deformation and strain development in both fiber and steel shear reinforcement, and the piers, ultimate failure modes, were carefully examined. Shear deformation increases rather rapidly after peak load and concrete shear capacity decreases with the increase in shear deformation. Stiffness of fiber affects the development of shear deformation and the descending branch of the load-deformation curve after the peak load. A simple model to predict the piers deformation capacity, based on the experimental results, was proposed. © 2006 Elsevier Ltd. All rights reserved.

AB - One of the major drawbacks of structure strengthening by fiber reinforced polymer wrapping using materials such as CFRP and AFRP, whose strength and stiffness are high, is the brittle nature of failure mode, which is caused by fracture of the fiber due to low fracturing strain. A series of experiments were conducted to investigate the efficiency of using two new types of fibers, polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) fiber, for seismic strengthening of RC piers. These fibers have the properties of low stiffness and high fracturing strain. Specimens strengthened by PET and PEN fiber sheets wrapping showed considerable improvement in shear capacity and ductility compared to the control specimen. Both PET and PEN showed no tendency to fiber breakage before the pre-defined ultimate deformation. Pier behaviors such as shear deformation and strain development in both fiber and steel shear reinforcement, and the piers, ultimate failure modes, were carefully examined. Shear deformation increases rather rapidly after peak load and concrete shear capacity decreases with the increase in shear deformation. Stiffness of fiber affects the development of shear deformation and the descending branch of the load-deformation curve after the peak load. A simple model to predict the piers deformation capacity, based on the experimental results, was proposed. © 2006 Elsevier Ltd. All rights reserved.

KW - Ductility

KW - High fracturing strain

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KW - PET

KW - Shear

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Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain

Abstract

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Research Keywords

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