### Finite Element Modeling of Concrete Specimens Confined with Metal Sheet Strips

*Maetee Boonpichetvong, Tanyada Pannachet, Siraphon Pinitkarnwatkul*

**Abstract**: This paper introduced a

nonlinear finite element model using Msc.MARC to study behavior of concrete

columns partially confined with metal sheet strips under uniaxial compression.

The concrete and the metal sheet parts were modeled using the linear

Mohr-Coulomb yield criterion and the Von-Mises yield criterion, respectively.

Behaviors of the interface (bonding) material, both in the normal direction and

the parallel direction to the interface, were modeled as a bilinear function

based on the cohesive energy and the crack widths. The columns in this study

had circular cross sections with the diameter of 15 cm and the height of 75 cm,

wrapped around by 5 cm metal sheet strips. The results from 3D finite element

modeling were analyzed for internally induced stresses and strains. The

predicted column behavior was compatible with observed experimental data. The

detailed mechanisms that were difficult to visualize during the laboratory

experiments could be obtained from the analysis. It was revealed that the area

of confinement and the number of applied metal sheet layers were important

factors to the strength increase. The discrete confinement system was shown to

be a promising alternative to the one-piece full-wrap system.

**Keywords**: Column; Concrete; Confinement; Finite element analysis; Metal sheet

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