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Article Citation - WoS: 7Citation - Scopus: 10Space Efficiency in North American Skyscrapers(Mdpi, 2024) Ilgin, Huseyin Emre; Aslantamer, Ozlem NurSpace efficiency in North American skyscrapers is crucial due to financial, societal, and ecological reasons. High land prices in major cities require maximizing every square foot for financial viability. Skyscrapers must accommodate growing populations within limited spaces, reducing urban sprawl and its associated issues. Efficient designs also support environmental sustainability and enhance city aesthetics, while optimizing infrastructure and services. However, no comprehensive study has examined the key architectural and structural features impacting the space efficiency of these towers in North America. This paper fills this gap by analyzing data from 31 case study skyscrapers. Findings indicated that (1) central core was frequently employed in the organization of service core; (2) most common forms were setback, prismatic, and tapered configurations; (3) outriggered frame and shear walled frame systems were mostly used; (4) concrete was the material in most cases; and (5) average space efficiency was 76%, and the percentage of core area to gross floor area (GFA) averaged 21%, from the lowest of 62% and 13% to the highest of 84% and 31%. It is expected that this paper will aid architectural and structural designers, and builders involved in shaping skyscrapers in North America.Article Citation - Scopus: 1A Comparative Analysis of Skyscraper Design Characteristics in the Middle East, Asia, and North America(Hapres Limited, 2025) Ilgın, H.; Aslantamer, Ö.The proliferation of skyscrapers in rapidly urbanizing regions necessitates a comparative understanding of architectural and structural design strategies. The Middle East, Asia, and North America have emerged as dominant centers of high-rise development, each influenced by unique environmental, cultural, and economic conditions. This study employs a case study approach, analyzing 133 skyscrapers (≥300 m) using qualitative and quantitative metrics. The analysis focuses on core typology, structural systems, materials, and architectural form, based on data extracted from the Council on Tall Buildings and Urban Habitat (CTBUH) database. Findings reveal regional distinctions: Asian skyscrapers favor tapered and composite designs with outriggered frame systems; Middle Eastern towers emphasize prismatic forms using concrete; and North American high-rises balance setback and prismatic forms with concrete and shear-frame systems. A central core layout dominates all regions, driven by efficiency and safety considerations. These insights offer valuable benchmarks for architects, engineers, and urban planners aiming to optimize skyscraper design in dense urban contexts. These insights offer valuable benchmarks for architects, engineers, and urban planners aiming to optimize high-rise design in dense urban contexts. © 2025 Elsevier B.V., All rights reserved.
