Measurement of axial stress distributions in FRP-confined concrete columns using Tekscan pressure sensors

J. G. Teng, J. J. Zeng, J. F. Chen

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

Abstract

Strengthening of reinforced concrete (RC) columns through the provision of lateral confinement using fiber-reinforced polymer (FRP) jackets is now a widely accepted technique. While the behavior of concrete uniformly confined with FRP, as is found in FRP-confined circular concrete columns under concentric compression, is now well understood, there is much less understanding of the behavior of concrete non-uniformly confined with FRP (e.g. FRP-confined rectangular columns under axial compression). A major difficulty with existing studies on concrete columns under non-uniform FRP confinement lies in the lack of knowledge of precise stress distributions in such columns, and as a result, direct verification in terms of internal stress distributions of analytical/numerical models for FRP-confined concrete in these columns has been impossible. Against this background, the present paper presents the first ever study on the measurement of axial stress distributions in FRP-confined rectangular columns under concentric compression using a new pressure mapping technique. The measurement technique is first introduced, and the procedure for obtaining axial stresses in FRP-confined column is then explained. A comparison between the experimental results and the predictions of an advanced finite element model is next given, which provides mutual verification of the two methods.

Conference

ConferenceJoint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures, FRPRCS 2015 and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures, APFIS 2015
Country/TerritoryChina
CityNanjing
Period14/12/1516/12/15

Keywords

  • Axial stress distribution
  • Confinement
  • FRP
  • Pressure sensor
  • Rectangular column
  • Strengthening

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)

Cite this