Abstract
Abstract In this paper, the finite element method was used for the numerical modeling of columns with square, rectangular and circular cross sections wrapped with FRP. The numerical modeling was successfully calibrated with the experimental data considering axial load, axial strain and transverse strain. The distribution of compressive stresses in the cross section of the column indicates that for centered load, circular cross sections have uniform distribution and for square and rectangular sections the effective confined concrete was defined by parabolas and concentrates next to the rounded corners. For eccentric load, the effective confined region moves to the most confined edge, thus, this does not reduce the gain for square and rectangular columns, but is unfavorable for circular columns.
Highlights
The finite element method was used for the numerical modeling of columns with square, rectangular and circular cross sections wrapped with Fiber Reinforced Polymers (FRP)
Fiber Reinforced Polymers (FRP) are materials composed of fibers combined with a polymeric matrix
In the case of eccentric loading, the FRP deformations were larger in the perimeter near the more compressed region of the section
Summary
Fiber Reinforced Polymers (FRP) are materials composed of fibers combined with a polymeric matrix. They appear as an alternative in relation to conventional materials for strengthening and rehabilitation of structures. FRP is used in concrete columns in the shape of a jacket to obtain strength improvement through the lateral confinement mechanism. Richart et al [2] affirm that this mechanism is more efficient for circular columns cross section because the lateral confinement pressure is uniformly transferred to the concrete by the membrane effect. For square and rectangular shapes, the cross section is not completely confined, because the lateral pressure is developed only near the rounded corners, where the membrane effect is developed (Shehata [4]). The efficiency of FRP confinement is influenced by the load eccentricity, creating a coupled effect that is related to the confinement level, the cross sectional shape, and the load eccentricity (Maaddawy [5])
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