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Article Evaluation of Space Efficiency, Structural Systems, Material Applications, and Design of High-Rise Structures in South Korea(Highlights of Science, 2025) Aktaş, K.O.; Zaim, A.; Aslantamer, Ö.N.; Aktas, G.G.; Ilgın, H.E.This study examines 61 South Korean towers, analyzing their architectural configu-rations, structural systems, material applications, and spatial efficiencies. Findings indicate a pre-dominance of central core configurations and prismatic forms, reinforcing a function-driven approach to vertical urbanism. Structural system preferences highlight the widespread use of out-riggered frames, ensuring lateral stability while optimizing floor layouts. Material selection trends reveal a reliance on concrete, aligning with global patterns, while composite materials (25%) are used in high-performance supertall structures. Functionally, residential high-rises dominate, with mixed-use (2%) and office towers (11%) remaining limited. This research also identifies an aver-age spatial efficiency of 76%, aligning with international benchmarks, though variations exist across cities due to core-to-gross floor area ratios, structural constraints, and service core alloca-tions. This research underscores South Korea’s strategic high-rise development, prioritizing space optimization, structural efficiency, and economic feasibility. However, opportunities re-main for increased functional diversity, broader hybrid material adoption, and greater integration of sustainable design innovations. These findings contribute to global skyscraper analysis, offering insights into high-rise architecture’s role in urban resilience and density management. © 2025 Aktaş et al.Article Analyzing Space Efficiency in Japanese Tall Buildings(Taylor & Francis Ltd, 2025) Ilgin, Huseyin Emre; Aslantamer, Ozlem NurSpace efficiency in Japanese tall buildings holds substantial significance, shaped by financial, societal, and environmental imperatives. Nevertheless, comprehensive studies addressing spatial efficiency in such towers remain scarce. To bridge this gap, this article undertakes a quantitative spatial analysis of 40 Japanese tall buildings through BIM/CAD-based floor plan evaluations and comparison of net-to-gross and core-to-GFA efficiency ratios. Key findings include: (1) mixed-use and office typologies, central cores, and prismatic massing dominate contemporary Japanese high-rise design; (2) composite structures with shear-walled frame systems are prevalent; and (3) the average net-to-gross ratio is 75%, with core areas occupying 23% of total GFA. The efficiency metrics range from 64% to 85% for net-to-gross ratios, and from 13% to 34% for core-to-GFA ratios. This research offers practical insights for stakeholders - especially architects and planners - to support more efficient and sustainable high-rise design strategies in Japan.
