Concrete and Earthquake Engineering Research Group

Department of Civil & Structural Engineering

Compressive behavior of concrete actively confined by metal strips; Part B: Analysis

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Abstract

This paper presents analytical part of an investigation on the application of prestressed strips for concrete confinement. In this paper, an analytical model is proposed to predict the compressive stress-strain curve of strapped concrete as a function of the confinement level. The model was calibrated based on the experimental data of compressive tests which were described in part A of this paper. Various parameters are considered in the proposed model including volumetric ratio, yield strength and ultimate strain of confining material, shape of cross section, strength of plain concrete. Three key points were defined on the stress-stress curve of strapped concrete columns and applied in model definition including critical, yield and ultimate points. The model showed good capability in predicting the compressive stress-strain curve of tested strapped concrete specimens. The model is also compared to some of the conventional confinement models in prediction of the strength gained by post-tensioned strips. In addition, a plasticity model was applied in the nonlinear finite element analysis of prismatic and cylindrical tested specimens with various levels of confinement. It is shown that these models are able to predict the experimental results, reasonably. © 2010 RILEM.

Publication details

Year: 
2010
Publication type: 
Journal article
Awarded by: 
Journal / conference name: 
Materials and Structures/Materiaux et Constructions
Awarded date: 
Volume: 
43
Issue: 
10
Start page: 
1383
End page: 
1396
ISSN: 
1359-5997