Effect of External Confining Pressure on Concrete Columns' Strength

Abstract

Numerous methodologies and techniques have been devised to strengthen columns, encompassing concrete and steel jackets, as well as wrapping with carbon or glass fibers. In this study, it is employed on a previously proposed technique by authors (Al-Tuhami, 2000, Al-Tuhami & Sakr, 2000) to strengthen columns. This approach has demonstrated its efficacy in augmenting the load capacity of columns and ameliorating the performance of reinforced concrete columns. The empirical results unequivocally indicate a substantial improvement in the ability to withstand elevated vertical loads when concrete columns are strengthened with externally encircling steel angles and horizontal stirrups. To achieve more favorable outcomes, it became evident that the connection between beams and columns necessitates strengthened. Moreover, the condensation on the weaker parts of the column on top and bottom warrants attention to optimize results through an increase in the quantity of horizontal stirrups at both top and bottom of the columns. Finite element models, utilizing ABACOUS, were developed to investigate the behavior of these strengthened columns. These models were validated and refined through the meticulous comparison of experimental and simulated results, demonstrating a good agreement between the two.