Axial-flexural behavior of FRP grid-reinforced geopolymer concrete sandwich wall panels enabled with FRP connectors

Sushil Kumar; Binqi Chen; Yuye Xu; Jian-Guo Dai

doi:10.1016/j.jobe.2021.103907

Axial-flexural behavior of FRP grid-reinforced geopolymer concrete sandwich wall panels enabled with FRP connectors

Sushil Kumar, Binqi Chen, Yuye Xu, Jian-Guo Dai^*

^*Corresponding author for this work

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

22 Citations (Scopus)

Abstract

This paper presents experimental and theoretical investigations conducted on a novel precast concrete sandwich wall panel (SWP) subjected to eccentric axial loading. The proposed SWP is composed of geopolymer concrete wythes which were embedded with basalt fiber reinforced polymer (FRP) bars/grids. Hollow Glass FRP (GFRP) tubes were used as connectors. Nine such SWPs were prefabricated and tested. The key design test parameters considered were slenderness ratio of the SWP, load eccentricity, and type of longitudinal reinforcement (FRP bar or grid) in wythes. The failure modes, load-deformation behavior, and load-strain behavior were studied and reported. It was found that the axial load capacities of the eccentrically loaded SWPs subject to load eccentricity-to-sectional thickness ratios of 0.15, 0.45, and 0.63 were reduced by 35%, 75%, and 85% (average of the load capacity values for the slender and squat SWPs), respectively, compared to their counterpart concentrically loaded SWPs. A second-order theoretical analysis was also conducted to obtain the axial load-moment interaction curves of equivalently assumed sections, and the outcomes were compared with the experimental ones to validate the modeling. © 2021 Elsevier Ltd.

Original language	English
Article number	103907
Journal	Journal of Building Engineering
Volume	47
Online published	18 Dec 2021
DOIs	https://doi.org/10.1016/j.jobe.2021.103907
Publication status	Published - 15 Apr 2022
Externally published	Yes

Funding

The authors would like to express their gratitude to the National Key Research Program of China (Grant No: 2017YFC0703002 ), Hong Kong RGC General Research Fund (Project code: 15214517 ), the Construction Industry Council , Hong Kong SAR (Project code: K-ZJK2 ), the National Science Foundation of China (Project No: 51778247 ), the Research Institute for Sustainable Urban Development , of The Hong Kong Polytechnic University (Project Nos. 1-BBWA and 1-BBWE) for the financial support to this research project. The authors are also grateful to the College of Civil Engineering, Huaqiao University, Xiamen, China, for providing access to the lab facility to carry out experimental works. The authors would like to express their gratitude to the National Key Research Program of China (Grant No: 2017YFC0703002), Hong Kong RGC General Research Fund (Project code: 15214517), the Construction Industry Council, Hong Kong SAR (Project code: K-ZJK2), the National Science Foundation of China (Project No: 51778247), the Research Institute for Sustainable Urban Development, of The Hong Kong Polytechnic University (Project Nos. 1-BBWA and 1-BBWE) for the financial support to this research project. The authors are also grateful to the College of Civil Engineering, Huaqiao University, Xiamen, China, for providing access to the lab facility to carry out experimental works.

Research Keywords

BFRP reinforcement
Eccentric axial load
Geopolymer concrete
GFRP connector
Sandwich wall panel
Theoretical second-order analysis

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title = "Axial-flexural behavior of FRP grid-reinforced geopolymer concrete sandwich wall panels enabled with FRP connectors",

abstract = "This paper presents experimental and theoretical investigations conducted on a novel precast concrete sandwich wall panel (SWP) subjected to eccentric axial loading. The proposed SWP is composed of geopolymer concrete wythes which were embedded with basalt fiber reinforced polymer (FRP) bars/grids. Hollow Glass FRP (GFRP) tubes were used as connectors. Nine such SWPs were prefabricated and tested. The key design test parameters considered were slenderness ratio of the SWP, load eccentricity, and type of longitudinal reinforcement (FRP bar or grid) in wythes. The failure modes, load-deformation behavior, and load-strain behavior were studied and reported. It was found that the axial load capacities of the eccentrically loaded SWPs subject to load eccentricity-to-sectional thickness ratios of 0.15, 0.45, and 0.63 were reduced by 35%, 75%, and 85% (average of the load capacity values for the slender and squat SWPs), respectively, compared to their counterpart concentrically loaded SWPs. A second-order theoretical analysis was also conducted to obtain the axial load-moment interaction curves of equivalently assumed sections, and the outcomes were compared with the experimental ones to validate the modeling. {\textcopyright} 2021 Elsevier Ltd.",

keywords = "BFRP reinforcement, Eccentric axial load, Geopolymer concrete, GFRP connector, Sandwich wall panel, Theoretical second-order analysis",

author = "Sushil Kumar and Binqi Chen and Yuye Xu and Jian-Guo Dai",

year = "2022",

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doi = "10.1016/j.jobe.2021.103907",

language = "English",

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T1 - Axial-flexural behavior of FRP grid-reinforced geopolymer concrete sandwich wall panels enabled with FRP connectors

AU - Kumar, Sushil

AU - Chen, Binqi

AU - Xu, Yuye

AU - Dai, Jian-Guo

PY - 2022/4/15

Y1 - 2022/4/15

N2 - This paper presents experimental and theoretical investigations conducted on a novel precast concrete sandwich wall panel (SWP) subjected to eccentric axial loading. The proposed SWP is composed of geopolymer concrete wythes which were embedded with basalt fiber reinforced polymer (FRP) bars/grids. Hollow Glass FRP (GFRP) tubes were used as connectors. Nine such SWPs were prefabricated and tested. The key design test parameters considered were slenderness ratio of the SWP, load eccentricity, and type of longitudinal reinforcement (FRP bar or grid) in wythes. The failure modes, load-deformation behavior, and load-strain behavior were studied and reported. It was found that the axial load capacities of the eccentrically loaded SWPs subject to load eccentricity-to-sectional thickness ratios of 0.15, 0.45, and 0.63 were reduced by 35%, 75%, and 85% (average of the load capacity values for the slender and squat SWPs), respectively, compared to their counterpart concentrically loaded SWPs. A second-order theoretical analysis was also conducted to obtain the axial load-moment interaction curves of equivalently assumed sections, and the outcomes were compared with the experimental ones to validate the modeling. © 2021 Elsevier Ltd.

AB - This paper presents experimental and theoretical investigations conducted on a novel precast concrete sandwich wall panel (SWP) subjected to eccentric axial loading. The proposed SWP is composed of geopolymer concrete wythes which were embedded with basalt fiber reinforced polymer (FRP) bars/grids. Hollow Glass FRP (GFRP) tubes were used as connectors. Nine such SWPs were prefabricated and tested. The key design test parameters considered were slenderness ratio of the SWP, load eccentricity, and type of longitudinal reinforcement (FRP bar or grid) in wythes. The failure modes, load-deformation behavior, and load-strain behavior were studied and reported. It was found that the axial load capacities of the eccentrically loaded SWPs subject to load eccentricity-to-sectional thickness ratios of 0.15, 0.45, and 0.63 were reduced by 35%, 75%, and 85% (average of the load capacity values for the slender and squat SWPs), respectively, compared to their counterpart concentrically loaded SWPs. A second-order theoretical analysis was also conducted to obtain the axial load-moment interaction curves of equivalently assumed sections, and the outcomes were compared with the experimental ones to validate the modeling. © 2021 Elsevier Ltd.

KW - BFRP reinforcement

KW - Eccentric axial load

KW - Geopolymer concrete

KW - GFRP connector

KW - Sandwich wall panel

KW - Theoretical second-order analysis

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Axial-flexural behavior of FRP grid-reinforced geopolymer concrete sandwich wall panels enabled with FRP connectors

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