Stability Analysis of Retrofitted Thin-Walled Slender Columns Subjected to Edge Loads using Finite Element Method
Abstract
In modern high-rise construction, thin-walled slender columns are commonly used due to their structural efficiency and aesthetic appearance. These columns often require retrofitting using Fibre-Reinforced Polymer (FRP) laminates to enhance their load-carrying capacity or to strengthen existing structures. The present investigation examines the stability behaviour of such columns, both with and without FRP retrofitting, when subjected to partial or concentrated edge loads. The analysis is carried out using a finite element (FE) formulation that incorporates shear deformation and rotary inertia effects. The column is discretized using an eight-noded plate element, with five degrees of freedom per node. This study primarily focuses on understanding the influence of different ply orientations in the retrofitted FRP laminates, positioning of partial/concentrated loads, and number of stories (height effect) on the stability performance of the thin-walled slender columns.
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