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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 Shanghai's High-Rise Buildings: Exploring Space Efficiency, Structural Systems, Forms, Materials and Core Designs(Taylor & Francis Ltd, 2026) Aktas, Kurt Orkun; Aslantamer, Ozlem Nur; Aktas, Gozen Guner; Ilgin, Huseyin EmreThis study examines the architectural and structural design considerations influencing space efficiency in Shanghai's high-rise buildings. Understanding space efficiency is significant because it directly affects land-use intensity, economic returns, and sustainability outcomes. The objective of this study is to quantify space efficiency ratios by analyzing the relationships between core types, function, form, and structural systems, and assess temporal and comparative benchmarks for Shanghai within the global context. The novelty lies in its combined focus on architectural and structural determinants of space efficiency, supported by data on 43 high-rise buildings in Shanghai. Methodologically, this study relies on quantitative analysis of Net Floor Area (NFA), Gross Floor Area (GFA), and core ratios, supplemented with comparative evaluation of building forms, materials, and structural systems. The key findings reveal: (1) average space efficiency at 75% with core-to-GFA ratios of 23%, varying between 52-93% and 5-33% respectively; (2) the dominance of prismatic forms supported by composite outriggered frame systems; (3) a decline in efficiency with increasing building height due to larger service cores. Practically, this research highlights opportunities for stakeholders - including architects, engineers, and policymakers - to adopt lightweight materials, prefabrication techniques, and smart building systems that improve space efficiency in future high-rise developments.Article A Comprehensive Study of Space Efficiency in Tall Buildings: The Australian Perspective(Kauno Technologijos Universitetas, 2025) Ilgın, H.; Aslantamer, Ö.Spatial efficiency in Australian towers is shaped by a multifaceted interaction of many parameters such as architectural and structural considerations. However, there are no comprehensive studies available on space utilization in Australian high-rise towers. The article addresses this gap by investigating 32 case studies. This study aims to investigate how contemporary Australian tall buildings achieve spatial efficiency by analyzing the relationship between architectural and structural parameters and internal usable area ratios. Key findings: residential function, centrally-located core layouts, and prismatic arrangements are the most widespread trends; concrete is the favored construction material, with the shear-walled frame system being the most commonly used structural system; average space efficiency is 82%, with a core-to-GFA ratio of 16%. The paper offers valuable understandings for construction experts to inform design decisions in high-rise construction projects within the Australian context. © 2025, Kauno Technologijos Universitetas. All rights reserved.Article Citation - WoS: 1Citation - Scopus: 3Space Efficiency in Tall Timber Buildings: A Comprehensive Review(Highlights of Science, 2025) Ilgın, H.; Aslantamer, Ö.Tall timber construction is gaining popularity due to its notable environmental and economic benefits throughout its lifecycle. Maximizing space efficiency in these buildings is a key factor in ensuring project viability. However, there has been a lack of comprehensive research on the space efficiency of these projects. This study focused on analyzing 50 tall buildings (over eight stories) globally to improve insights into the design elements that affect space use. The key findings include: i) predominant architectural configurations incorporate residential functions, a centrally positioned core, and prismatic building forms; ii) composite materials are the most utilized, with shear-walled frame systems being the preferred structural solution; and iii) average space efficiency is 84%, with core areas accounting for 11% of the gross floor area, ranging from 71% and 4% at the lower end to 93% and 21% at the upper end. This study provides valuable guidance for architects and other key participants engaged in the planning and construction of tall timber buildings. © 2025 Ilgın and Aslantamer.
