Behaviour of frp-reinforced geopolymer concrete sandwich wall panels under eccentric loading

Sushil Kumar, Binqi Chen, Yuye Xu, Jian Guo Dai

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Precast concrete sandwich panels, consisting of two concrete wythes and a thermal insulation layer in between, have great potential in use for prefabricated building construction. In the present study, experimental and theoretical investigations were conducted to understand the eccentric axial compression behavior of a novel precast concrete sandwich wall panel (SWP), which are made of basalt fiber reinforced polymer (FRP)-reinforced geopolymer concrete for its two wythes and laterally connected with hollow Glass FRP (GFRP) tubular connectors. Nine such SWPs were prefabricated and tested, of which the six were subjected to eccentric axial loading, while the remaining three were tested for concentric axial loading. The primary test variables included slenderness ratio of the SWP, load eccentricity and type of longitudinal reinforcement (FRP bar or grid) in wythes. The load-deflection relationships, failure modes, and load-strain relationships were carefully investigated. It is found that the slender SWPs subjected to large load eccentricity underwent stability failure. The remaining slender SWPs with small load eccentricity and all squat SWPs failed by crushing of concrete (i.e., material failure). The experimental axial load-moment interaction curves were obtained both for the squat and slender SWPs. The second-order moments were found to be 17% and 59% at average of the first-order moments for squat and slender SWPs, respectively. The basalt FRP grids could sustain large tensile and compressive strains without rupturing and local buckling until failure of the SWP. A second-order theoretical analysis was also performed to predict the axial load-moment interaction curves of equivalently assumed solid wall panels, and the predicted results were compared with the experimental ones to validate the modeling.

Original languageEnglish
Title of host publicationConcrete Structures
Subtitle of host publicationNew Trends for Eco-Efficiency and Performance - Proceedings of the fib Symposium 2021
EditorsEduardo Julio, Jonatas Valenca, Ana Sofia Louro
Publisherfib. The International Federation for Structural Concrete
Pages218-227
Number of pages10
ISBN (Electronic)9782940643080
Publication statusPublished - 2021
Event2021 fib Symposium of Concrete Structures: New Trends for Eco-Efficiency and Performance - Virtual, Lisbon, Portugal
Duration: 14 Jun 202116 Jun 2021

Publication series

Namefib Symposium
Volume2021-June
ISSN (Print)2617-4820

Conference

Conference2021 fib Symposium of Concrete Structures: New Trends for Eco-Efficiency and Performance
Country/TerritoryPortugal
CityVirtual, Lisbon
Period14/06/2116/06/21

Keywords

  • BFRP reinforcement
  • FRP connector, Eccentric axial loading
  • Geopolymer concrete
  • Precast sandwich panel

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (miscellaneous)

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