TY - JOUR
T1 - Bond-slip behaviour between FRP tubes and seawater sea sand concrete
AU - Bazli, Milad
AU - Zhao, Xiao Ling
AU - Bai, Yu
AU - Singh Raman, R. K.
AU - Al-Saadi, Saad
N1 - Funding Information:
The authors wish to acknowledge the financial support provided by the Australian Research Council (ARC) through an ARC Discovery Grant ( DP160100739 ). Thanks are given to the Civil Engineering laboratory technical staff of Monash University for helping in conducting the experimental tests.
Publisher Copyright:
© 2019
PY - 2019/10/15
Y1 - 2019/10/15
N2 - In the present study the bond-slip behavior between FRP tubes and seawater sea sand concrete is studied using push-out tests. Pultruded and filament winding FRP tubes with different fibre orientations and diameter-to-thickness ratios (D/t) were constructed to investigate the effect of confinement pressure on the bond behaviour. Moreover, to study the effect of fibre type, three types of FRP (i.e.; GFRP, CFRP and BFRP) were used. In addition, the mechanical and chemical bond strength of concrete filled FRP tubes were quantified and compared. CFRP and BFRP tubes showed the highest and the lowest bond strengths, respectively. Furthermore, it was concluded that the real confinement pressure of the tubes has a significant effect on the bond strength: the greater the real confinement pressure, the larger the bond strength (i.e. the tubes with smaller D/t ratio and fibres orientated in 89° showed greater bond strength compared to the tubes with larger D/t and different fibres orientations). Repeating the push-out test for four times, for each sample, showed that the slip starts earlier by increasing the number of repetition, while the bond strength remained almost the same. This shows that the bond strength of tubes is mostly governed by the friction (confinement pressure) rather than the adhesion (chemical bond).
AB - In the present study the bond-slip behavior between FRP tubes and seawater sea sand concrete is studied using push-out tests. Pultruded and filament winding FRP tubes with different fibre orientations and diameter-to-thickness ratios (D/t) were constructed to investigate the effect of confinement pressure on the bond behaviour. Moreover, to study the effect of fibre type, three types of FRP (i.e.; GFRP, CFRP and BFRP) were used. In addition, the mechanical and chemical bond strength of concrete filled FRP tubes were quantified and compared. CFRP and BFRP tubes showed the highest and the lowest bond strengths, respectively. Furthermore, it was concluded that the real confinement pressure of the tubes has a significant effect on the bond strength: the greater the real confinement pressure, the larger the bond strength (i.e. the tubes with smaller D/t ratio and fibres orientated in 89° showed greater bond strength compared to the tubes with larger D/t and different fibres orientations). Repeating the push-out test for four times, for each sample, showed that the slip starts earlier by increasing the number of repetition, while the bond strength remained almost the same. This shows that the bond strength of tubes is mostly governed by the friction (confinement pressure) rather than the adhesion (chemical bond).
KW - Bond-slip
KW - Concrete filled tube
KW - FRP tubes
KW - Push-out
KW - Seawater sea sand concrete
UR - http://www.scopus.com/inward/record.url?scp=85069728301&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2019.109421
DO - 10.1016/j.engstruct.2019.109421
M3 - Journal article
AN - SCOPUS:85069728301
SN - 0141-0296
VL - 197
JO - Engineering Structures
JF - Engineering Structures
M1 - 109421
ER -