Confinement of high strength concrete columns : parametric investigation

الملخص FRE

The use of high strength concrete has become an almost unavoidable reality due to designers demand.

The purpose of this paper is to show the influence of the confinement on the behavior of high strength concrete columns in compression, in terms of strength and ductility gain, as well as the stress-strain behavior, using certain existing analytical models and experimental data published over the last decade.

The study takes into account the influence of various parameters, such as the compressive strength of the concrete, the yield strength of transverse reinforcement steel, the longitudinal reinforcement density relative to the raw section of the element, and the density of the reinforcement transverse to the confined core.

Two types of section were chosen, square and circular, with different transverse steels configurations.

The results show that the increase in compressive strength is the most unfavorable factor in terms of strength and ductility gain, in contrary to the density of the transverse steels.

The arrangement of the latter plays an important role since it offers a resistance gain ranging from 50 to 100% and that of the ductility from 10 to 20%.

The increase in this density also improves the stress-strain behavior of the column element.