The Effectiveness of the Recycled Aggregate on the Story Lateral Displacement and Story Drift of High-Rise Buildings

The present paper examines the effect of Recycled Aggregate (RA) on the story displacement and story drift of a 17-story high-rise building exposed to wind loads in both directions. For this purpose, four percentages of RA were used (0, 25, 50, and 100%), and four ETABS models were built according to these percentages. The lateral displacement increased with the percentage of RA, reaching 25.19% higher than the natural value at the roof when using 100% recycled aggregate. The shear walls' distribution has an effect on the displacement in each direction. The y-direction had a higher displacement because the walls act as lateral bracing and play a significant role in structural stability. The story drift had a similar behaviour to story displacement, displaying a 25% increase compared to the natural state when using 100% recycled aggregate. Additionally, all models met the serviceability and safety requirements, and thus, the recycled aggregate may be used in reinforced concrete high-rise buildings. Finally, the optimised aggregate replacement ratio in concrete mix was between 25% and 50% to strike a balance between environmental benefits and structural performance.