Effect of Partial Geo-Grid Confinement on Circular Columns under Axial Loading

Abstract

The present research work deals with the application of geogrids in columns, that is partially replacing the conventional way of confining via stirrups with an alternative technique, means using geogrids partially as confining material along with stirrups. The reasons that has inspired for such an experimental research include fact that geogrids are good at tension and encourage flexibility, easy to handle (lighter in weight) and economical compared to steel. Total of sixteen columns (8 types) were casted. The parameters included spacing of stirrups (150 mm and 450 mm), use of type of concrete (NC and SFRC) and use of type of geogrids (average tensile strength of 100 kN/m and 200 kN/m). The columns were subjected to axial load under UTM and their load deflection curves were plotted and parameters such as ultimate load, maximum axial displacement, secant stiffness, ductility and energy dissipation were evaluated and compared. The test results revealed that application of geogrids along with fibres significantly improved the strength parameters of columns, thus paving out new way of reinforcing columns in combination with steel fibres.