Jacketing of RCC columns with varying stiffness

Abstract

The attempt in this article was made in a reinforced concrete frame with doors and windows left in owing to architectural requirements. Due to lateral loading, columns of varied stiffness have been badly damaged in the past, and this type of structure is prone to serious failure during earthquakes. The behaviour of such columns was not perfectly known. The behaviour of columns with varying stiffness under later pressure after jacketing with a carbon fibre mesh is investigated systematically in this project. The analytical study's parameters also include the infill wall aspect ratio (Lw/Hw, where Lw = infill length and Hw = infill height), column displacement and failure with varying stiffness, and carbon mesh wrapping. The load vs displacement curve and stiffness of the three models with variable stiffness columns and carbon fibre mesh wrapping were investigated. The lateral strength and rigidity of the columns increased when the stiffness of the column was strengthened with carbon mesh wrapping, while the displacement and ductility of the column reduced. Furthermore, the bare frame shows the largest displacement and failures at the beam-column joints and supports, causing the structure to become severely unstable and finally breaks. When a partial infill is applied to the frame of a column of different stiffness, failures are noted at the beam-column and infill junction, but supports show higher stability, and when jacketing is applied to the columns of varying stiffness, it exhibits the most stability and shows the least failure.