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Experimental Study of Strengthened Castellated Steel Columns under Axial and Low Frequency Cyclic Loading
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Experimental Study of Strengthened Castellated Steel Columns under Axial and Low Frequency Cyclic Loading
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Experimental Study of Strengthened Castellated Steel Columns under Axial and Low Frequency Cyclic Loading
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Journal Article
Experimental Study of Strengthened Castellated Steel Columns under Axial and Low Frequency Cyclic Loading
2025
Overview
This study aims to analyze the structural performance of castellated steel columns under axial load and seismic displacements, focusing on the effect of different strengthening techniques on load-bearing capacity and ductility. The purpose of this study is to determine the best method for strengthening these columns to improve their seismic response and reduce the risk of collapse. To achieve this, four specimens were analyzed: non-strengthened column, a horizontally strengthened column, a vertically strengthened column, and a column strengthened with horizontal and vertical plates. All specimens were subjected to a static axial load test of 40 kN, while lateral displacement was modelled using seismic data from a real event. The results showed that vertical strengthening was the most effective in enhancing load-bearing capacity and improving seismic response. Maximum lateral loads increased by 63% in the vertically strengthened columns, 55% in the vertically and horizontally strengthened columns, and only 13% in the horizontally strengthened columns. This strengthening also reduced stress concentrations around the hexagonal openings, helping prevent collapse in those areas. Vertical strengthening represents the optimal solution for improving the seismic performance of castellated steel columns, providing an effective balance between load resistance and improved structural stability. Accordingly, the study recommends further research to develop more efficient strengthened techniques that enhance the resistance of steel columns in seismic applications.
