Analysis of the Performance of Slender High-Performance Reinforced Concrete Columns under the Effects of Slenderness and Reinforcement Ratio in Different Structural Conditions

The following report reviews recent developments in the framework of slender column design in different materials and in different conditions. Important parameters for stability and load capacity are slenderness ratio and load eccentricity and they affect failure modes such as buckling. The physical properties have been enhanced in systems such as: concrete-encased steel, concrete-filled steel tubulars, ultra-high performance fiber reinforced concrete, and timber-steel based hybrids. However, the ductility and strength can be improved through fiber-reinforced polymer strengthening and recycled aggregate concrete confinement methods, although their effectiveness can vary. Corrosion and environmental degradation can fast-track strength loss, requiring predictive models for section loss and changes in confinement. New insights and risk analyses have also found weaknesses in the existing design codes, which resulted in suggestions for enhanced safety criteria and adjustments to the prediction of slender column behavior. Using parameters such as slenderness and stiffening mechanisms, new analytical formulas and design methodologies were created to achieve accuracy. Overall, the findings support sustainable structural designs; however, further experimental validation and refined modeling will be essential to address future challenges.