Resumen de Uni axial compression behaviour of lightweight expanded clay aggregate concrete cylinders confined by perforated steel tube and GFRP wrapping
Sathia Ramalingam, Vijayalakshmi Ramalingam, Ramanagopal Srinivasan, Vikram Gopinath, Yuvarani Ramanareddy, Yuvalatha Ramanareddy
This study presents the experimental investigation carried out on an Expanded Clay Aggregate concrete column confined by perforated steel tube strengthened by Glass Fiber Reinforced Polymer (GFRP) sheets under uniaxial compression. Two parameters were considered for the experimental investigation: The diameter of the perforated steel tube (5 mm and 10 mm) and number of layers of GFRP wrapping (1,2, 3 and 4 layers). The compression behavior of perforated steel confined column was compared with GFRP tube encased concrete column and plain steel tube encased concrete column. The effect of perforation diameter and GFRP layers, on the failure pattern, stress-strain response, and ductility of the column were discussed. From this study, it can be concluded that the GFRP wrapping and perforated steel tube exerts the full potential to enhance the compression behaviour of expanded clay aggregate concrete column. The failure mode of GFRP wrapped perforated steel tube column was ductile in nature. The failure started with the rupture of GFRP layers followed by yielding of perforated steel tube and finally crushing of core concrete. The GFRP wrapping provides additional tensile strength to the column and the perforated steel tube with its elasto-plastic behaviour enhances the pre-cracking and post peak behaviour of the column. Better ductility performance was observed in the column with a greater number of GFRP wrapping and column with 10 mm diameter perforation.
