Numerical evaluation of localization and softening behavior of concrete confined by steel tubes

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Article

Source Title

Structural Concrete

First Page

1

Last Page

15

Publication Date

2018

Abstract

A newly developed coupled numerical model is presented to investigate the com- pressive localization and softening behavior of concrete under steel tube confine- ment. The coupled model combines the use of rigid body spring model (RBSM) and nonlinear shell finite element method (FEM) to simulate concrete and steel in steel tube–confined concrete members. Numerical evaluation of compression local- ization in steel tube–confined concrete columns showed that the compressive behavior of this type of column is also localized and that the length of the compressive fracture zone was found to be more localized in square cross section than equiva- lent circular cross section. With increasing slenderness and level of confinement, it was found that localization length increases with increasing confinement, and for higher confinement level, localization zone can only be observed in longer speci- mens. This means that localization and softening of concrete can always occur irre- spective of confinement level but depends on the size (height) of the member.

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Disciplines

Civil Engineering

Keywords

Concrete-filled tubes—Compression testing

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