Behavior of large-scale FRP-confined rectangular RC columns under eccentric compression

Guan Lin, J. J. Zeng, J. G. Teng, L. J. Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)

Abstract

Fiber-reinforced polymer (FRP) composites have become widely accepted in the strengthening or seismic retrofitting of reinforced concrete (RC) columns in practice. FRP-confined rectangular concrete columns under concentric axial compression have been extensively studied, leading to many stress-strain models (i.e., concentric-loading stress-strain models). Although RC columns in practical structures are commonly subjected to combined axial compression and bending (i.e., eccentric compression), existing research on eccentrically-loaded FRP-confined rectangular RC columns has been much more limited. More specifically, the limited research available has generally been concerned with small-scale RC columns, and the applicability of existing concentric-loading stress-strain models for FRP-confined concrete in the analysis of large-scale eccentrically-loaded rectangular RC columns has not been properly clarified. This paper presents the results of an experimental study including eight large-scale FRP-confined rectangular RC columns tested under eccentric compression. The following key test variables were carefully examined in the experimental program: the load eccentricity, the direction of bending, and the FRP jacket thickness. A theoretical column model is then presented for predicting the responses of the test columns. It is shown that the direct use of a concentric-loading stress-strain model for FRP-confined concrete in the column model leads to significant errors in predicting the ultimate deformation of the test columns.

Original languageEnglish
Article number110759
JournalEngineering Structures
Volume216
DOIs
Publication statusPublished - 1 Aug 2020

Keywords

  • Confinement
  • Eccentric loading
  • Fiber-reinforced polymer (FRP)
  • Large-scale column
  • Rectangular column
  • Reinforced concrete (RC)

ASJC Scopus subject areas

  • Civil and Structural Engineering

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