Innovative Application of Geo-Grid Confinement in RC Column under Axial Loading

Abstract

An experimental study has been carried out to check the feasibility of geo-grid as a confining member in columns. The parameters that were varied in the tests are spacing of ties (50mm, 100mm, 200mm, and 400mm), and cross-sectional shape of the column (circular & square). The confining effect of geo-grid was studied by wrapping layers of geo-grid of 90mm width to the control specimens having horizontal tie spacing of 200mm and 400mm respectively. All the specimens were tested under load controlled loading in an ACTM (Automatic Compression Testing Machine) to evaluate the strength parameters. Load-deflection graphs were plotted and strength parameters (peak load, peak displacement, secant stiffness, ductility and energy dissipation) were precisely calculated and tabulated. The geo-grid was found to significantly improve the strength parameters of the columns. The results of the investigation indicate that the geo-grid can be effectively used as a partial replacement for conventional steel ties in the RC column.