Behaviour of seawater and sea sand concrete filled FRP square hollow sections

Ying Lei Li; Xiao Ling Zhao; R. K. Singh Raman

doi:10.1016/j.tws.2019.106596

Behaviour of seawater and sea sand concrete filled FRP square hollow sections

Ying Lei Li, Xiao Ling Zhao, R. K. Singh Raman

Research output: Journal article publication › Journal article › Academic research › peer-review

20 Citations (Scopus)

Abstract

FRP tube could serve as formwork in new constructions and the square cross-section is convenient for connections. This paper presents an experimental and theoretical study on seawater sea sand concrete (SWSSC)-filled glass/carbon/basalt FRP square hollow section (SHS) stub columns and beams. FRP SHS includes fibres oriented in ±15°, ±40° and ±75° with respect to the longitudinal axis so that the hoop and axial strengths are comparable. Both unfilled FRP SHS and SWSSC-filled FRP SHS were tested under axial compressive, three-point or four-point bending loads. SWSSC-filled FRP columns failed by FRP rupture, whereas the failure mode for beams was the crushing of compressive flanges. In this paper, the stress-strain behaviour of columns and moment-strain curves of beams were discussed and compared to the corresponding SWSSC-filled stainless steel (SS) SHS specimens. It was found that existing stress-strain models, which were originally derived for rectangular concrete confined by FRP wrap, cannot precisely capture the stress-strain response of SWSSC-filled FRP columns. Existing models are improved to more accurately predict the ultimate axial strains and stress-strain relationship. A theoretical model is proposed to estimate the moment capacity of SWSSC-filled FRP beams with reasonable accuracy.

Original language	English
Article number	106596
Journal	Thin-Walled Structures
Volume	148
DOIs	https://doi.org/10.1016/j.tws.2019.106596
Publication status	Published - Mar 2020
Externally published	Yes

Keywords

Axial compression
Bending
FRP square hollow section
Seawater and sea sand concrete (SWSSC)
Theoretical model

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanical Engineering

More information

10.1016/j.tws.2019.106596

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title = "Behaviour of seawater and sea sand concrete filled FRP square hollow sections",

abstract = "FRP tube could serve as formwork in new constructions and the square cross-section is convenient for connections. This paper presents an experimental and theoretical study on seawater sea sand concrete (SWSSC)-filled glass/carbon/basalt FRP square hollow section (SHS) stub columns and beams. FRP SHS includes fibres oriented in ±15°, ±40° and ±75° with respect to the longitudinal axis so that the hoop and axial strengths are comparable. Both unfilled FRP SHS and SWSSC-filled FRP SHS were tested under axial compressive, three-point or four-point bending loads. SWSSC-filled FRP columns failed by FRP rupture, whereas the failure mode for beams was the crushing of compressive flanges. In this paper, the stress-strain behaviour of columns and moment-strain curves of beams were discussed and compared to the corresponding SWSSC-filled stainless steel (SS) SHS specimens. It was found that existing stress-strain models, which were originally derived for rectangular concrete confined by FRP wrap, cannot precisely capture the stress-strain response of SWSSC-filled FRP columns. Existing models are improved to more accurately predict the ultimate axial strains and stress-strain relationship. A theoretical model is proposed to estimate the moment capacity of SWSSC-filled FRP beams with reasonable accuracy.",

keywords = "Axial compression, Bending, FRP square hollow section, Seawater and sea sand concrete (SWSSC), Theoretical model",

author = "Li, {Ying Lei} and Zhao, {Xiao Ling} and {Singh Raman}, {R. K.}",

note = "Funding Information: The authors are grateful for the financial support provided by the Australian Research Council (ARC) through an ARC Discovery Grant ( DP160100739 ). We thank Mr. Damian Carr of Bayside City Council for his permission to obtain seawater and sea sand from Brighton Beach in Melbourne and CST composites for supplying FRP tubes. The tests were conducted in the Civil Engineering Laboratory and Mechanical at Monash University and the help of Mr. Long Goh, and Mr. Jeff Doddrell are greatly appreciated. Thanks are due to Ms Y.R. Gao and Ms Z.J. Xing for conducting some of the axial compressive experiments as part of their final year projects. Funding Information: The authors are grateful for the financial support provided by the Australian Research Council (ARC) through an ARC Discovery Grant (DP160100739). We thank Mr. Damian Carr of Bayside City Council for his permission to obtain seawater and sea sand from Brighton Beach in Melbourne and CST composites for supplying FRP tubes. The tests were conducted in the Civil Engineering Laboratory and Mechanical at Monash University and the help of Mr. Long Goh, and Mr. Jeff Doddrell are greatly appreciated. Thanks are due to Ms Y.R. Gao and Ms Z.J. Xing for conducting some of the axial compressive experiments as part of their final year projects. Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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doi = "10.1016/j.tws.2019.106596",

language = "English",

volume = "148",

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AU - Zhao, Xiao Ling

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N2 - FRP tube could serve as formwork in new constructions and the square cross-section is convenient for connections. This paper presents an experimental and theoretical study on seawater sea sand concrete (SWSSC)-filled glass/carbon/basalt FRP square hollow section (SHS) stub columns and beams. FRP SHS includes fibres oriented in ±15°, ±40° and ±75° with respect to the longitudinal axis so that the hoop and axial strengths are comparable. Both unfilled FRP SHS and SWSSC-filled FRP SHS were tested under axial compressive, three-point or four-point bending loads. SWSSC-filled FRP columns failed by FRP rupture, whereas the failure mode for beams was the crushing of compressive flanges. In this paper, the stress-strain behaviour of columns and moment-strain curves of beams were discussed and compared to the corresponding SWSSC-filled stainless steel (SS) SHS specimens. It was found that existing stress-strain models, which were originally derived for rectangular concrete confined by FRP wrap, cannot precisely capture the stress-strain response of SWSSC-filled FRP columns. Existing models are improved to more accurately predict the ultimate axial strains and stress-strain relationship. A theoretical model is proposed to estimate the moment capacity of SWSSC-filled FRP beams with reasonable accuracy.

AB - FRP tube could serve as formwork in new constructions and the square cross-section is convenient for connections. This paper presents an experimental and theoretical study on seawater sea sand concrete (SWSSC)-filled glass/carbon/basalt FRP square hollow section (SHS) stub columns and beams. FRP SHS includes fibres oriented in ±15°, ±40° and ±75° with respect to the longitudinal axis so that the hoop and axial strengths are comparable. Both unfilled FRP SHS and SWSSC-filled FRP SHS were tested under axial compressive, three-point or four-point bending loads. SWSSC-filled FRP columns failed by FRP rupture, whereas the failure mode for beams was the crushing of compressive flanges. In this paper, the stress-strain behaviour of columns and moment-strain curves of beams were discussed and compared to the corresponding SWSSC-filled stainless steel (SS) SHS specimens. It was found that existing stress-strain models, which were originally derived for rectangular concrete confined by FRP wrap, cannot precisely capture the stress-strain response of SWSSC-filled FRP columns. Existing models are improved to more accurately predict the ultimate axial strains and stress-strain relationship. A theoretical model is proposed to estimate the moment capacity of SWSSC-filled FRP beams with reasonable accuracy.

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VL - 148

JO - Thin-Walled Structures

JF - Thin-Walled Structures

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Behaviour of seawater and sea sand concrete filled FRP square hollow sections

Abstract

Keywords

ASJC Scopus subject areas

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