Browsing by Author "Ilgin, Huseyin Emre"

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Analyzing Space Efficiency in Japanese Tall Buildings
(Taylor & Francis Ltd, 2025) Ilgin, Huseyin Emre; Aslantamer, Ozlem Nur
Space 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.
Citation - WoS: 4
Citation - Scopus: 4
Comparative Analysis of Space Efficiency in Skyscrapers With Prismatic, Tapered, and Free Forms
(Mdpi, 2024) Ilgin, Huseyin Emre; Aslantamer, Ozlem Nur
This study offers a thorough comparative analysis of space efficiency in skyscrapers across three distinct forms: prismatic, tapered, and free. By examining case studies from each form category, this research investigates how architectural and structural design features impact space utilization in supertall towers. The findings reveal form-based differences in space efficiency and design element usage. In prismatic skyscrapers, which are primarily residential and utilize concrete outrigger frames, the average space efficiency was around 72%, with the core occupying 24% of the gross floor area (GFA). Tapered skyscrapers, commonly mixed-use with composite outrigger frames, showed an average space efficiency of over 70%, with a core-to-GFA ratio of 26%. Freeform towers, often mixed-use and using composite outrigger frames, demonstrated a space efficiency of 71%, with an average core-to-GFA ratio of 26%. Despite these variations, a consistent trend emerged: as the height of a building increases, there is a general decline in space efficiency, highlighting the challenges in optimizing space in taller structures. This analysis adds to the understanding of skyscraper design and space utilization, providing important insights for architects and urban planners aiming to improve the efficiency of future high-rise developments.
Citation - WoS: 5
Citation - Scopus: 8
Evaluating Space Efficiency of Tall Buildings in Turkey
(Mdpi, 2024) Aslantamer, Ozlem Nur; Ilgin, Huseyin Emre
In response to the increasing building demands in Turkey, particularly in the metropolitan area of Istanbul, followed by other major cities such as Ankara and Izmir, the expansion of construction zones has led to the emergence of tall towers as a pragmatic solution. The design and implementation of tall buildings require newer technologies and interdisciplinary collaboration in aspects such as facade installation, vertical circulation solutions, and fire systems, compared to low-rise buildings. In spite of the proliferation of skyscrapers, there is a noticeable lack of thorough study on space efficiency in Turkey's tall buildings. This article aims to fill this significant gap in the literature. The research method employed in this study focuses on a case study of 54 modern towers constructed in Turkey between 2010 and 2023, ranging in height from 147 to 284 m. Key findings are as follows: (1) residential use, central core, and prismatic forms are the most prevalent architectural preferences; (2) the most preferred structural material and system are concrete and the shear-walled frame system, respectively; (3) average space efficiency and the percentage of core-to-gross-floor area (GFA) were 78% and 19%, respectively, with measurement ranges varying from a minimum of 64% and 9% to a maximum of 86% and 34%. This paper will provide insight for construction stakeholders, especially architects, for sound planning decisions in the development of Turkish tall buildings.
Evaluating Space Efficiency Practices in Tehran's High-Rise Buildings: A Structural and Architectural Perspective
(Wiley, 2025) Mazaherylaghab, Hamed; Haghi, Marzieh; Ilgin, Huseyin Emre; Aslantamer, Ozlem Nur
Spatial efficiency in Tehran's high-rise building design is shaped by a complex blend of multiple factors such as architectural and structural considerations. Tehran's innovative and flexible strategies have allowed the city to address the complexities of high-rise design considerations, resulting in the creation of some of the most progressive and sustainable tall buildings in the Middle East. However, detailed studies on space utilization in Tehran's tall towers remain scarce. This article addresses this gap by analyzing 48 case study towers, revealing key trends such as the dominance of residential functions, central core designs, prismatic forms, and the frequent use of steel rigid frame systems. The analysis revealed an average spatial efficiency of 91% in Tehran's towers, with a core-to-GFA (gross floor area) ratio of only 6%, exceeding typical efficiency ratios observed in other regions, though shaped by Tehran's specific urban and economic context. These findings promote sustainability and provide crucial insights for construction professionals, supporting the informed decision-making process for tall building projects in Tehran and other densely urbanized areas.
Evaluation of Space Efficiency, Structural Systems, Material Applications, and Design of High-Rise Structures in South Korea
(Highlights of Science, 2025) Aktas, Kurt Orkun; Zaim, Ajda; Aslantamer, Ozlem Nur; Aktas, Gozen Guner; Ilgin, Huseyin Emre
This study examines 61 South Korean towers, analyzing their architectural configurations, structural systems, material applications, and spatial efficiencies. Findings indicate a predominance of central core configurations and prismatic forms, reinforcing a function-driven approach to vertical urbanism. Structural system preferences highlight the widespread use of outriggered 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 average 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 allocations. This research underscores South Korea's strategic high-rise development, prioritizing space optimization, structural efficiency, and economic feasibility. However, opportunities remain 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.
Citation - WoS: 2
Citation - Scopus: 3
Space Efficiency in European High-Rise Timber Buildings
(Mdpi, 2024) Ilgin, Huseyin Emre; Aslantamer, Ozlem Nur
As towering wooden edifices (>= 8 stories) become a rapidly expanding and promising field, they provide substantial environmental and economic advantages throughout their entire lifespans, leading to their increasing popularity, especially in the European context. Similar to various other construction forms, spatial efficiency is a vital design criterion in timber buildings to guarantee the viability of a project. Currently, there is no thorough study on spatial efficiency in these towers in Europe, which is home to the majority of the world's timber towers. This paper examined data from 56 cases to improve comprehension of the planning factors affecting space efficiency in these buildings. The main findings showed that the average space efficiency across the analyzed examples was documented at 82%, with deviations spanning from 70% to 90%, the average core area to gross floor area (GFA) ratio was determined to be 11%, ranging from 4% to 21%, and no substantial difference was noted in the impact of core arrangements on space efficiency, and parallel findings were observed for forms and construction materials. This article aspires to provide architectural designers with essential perspectives, assisting and directing them in the conception and realization of upcoming ventures both across Europe and internationally in this domain.
Citation - WoS: 6
Citation - Scopus: 8
Space Efficiency in North American Skyscrapers
(Mdpi, 2024) Ilgin, Huseyin Emre; Aslantamer, Ozlem Nur
Space 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.
Citation - WoS: 3
Citation - Scopus: 5
Space Efficiency in Tall Hotel Towers
(Mdpi, 2024) Aslantamer, Ozlem Nur; Ilgin, Huseyin Emre
Maximizing spatial utilization within tall buildings stands as a paramount planning consideration for ensuring project feasibility, particularly accentuated ins the context of hotel constructions. To date, no comprehensive study has addressed this issue while considering crucial architectural and structural planning factors. This article fills this gap by using a case study method based on data from 31 contemporary tall hotel towers. The findings revealed several key points: (i) central core typology was mostly utilized; (ii) prismatic buildings were the most prevalent forms; (iii) shear-walled frame systems were predominantly employed; (iv) concrete was the preferred choice for hotel construction; (v) the average space efficiency and the ratio of core area to gross floor area (GFA) averaged 81.2% and 16%, respectively; (vi) the range changed from a minimum of 70% to 4% to a maximum of 94% to 28%; and (vii) space efficiency showed an inverse relationship with the height of the building. It is anticipated that this paper will assist architects and structural engineers as well as builders involved in the planning of hotel developments.
Citation - WoS: 8
Citation - Scopus: 10
Space Efficiency in Timber Office Buildings
(Elsevier, 2024) Aslantamer, Ozlem Nur; Ilgin, Huseyin Emre
Timber offices indicate a growing field, principally thanks to their potential to offer noteworthy ecological and financial gains over their entire life. Like many other building types, space efficiency is a crucial design parameter in timber structures to ensure a project's feasibility. This factor is especially significant in office buildings, where maximizing rental income reflects effective planning. Currently, there is a lack of exhaustive inquiry providing a thorough insight of space efficiency in modern timber office buildings. This study fills this gap in the literature by collecting data from 33 buildings through literature reviews and case study method to investigate space efficiency with the key architectural and structural factors that influence it. The results showed that: (i) central cores stood out as the prevailing core layouts, while peripheral arrangements were noted as alternative preferences. Prismatic shapes emerged as the most favored options; (ii) timber was extensively used as a primary building material, closely followed by combinations of timber and concrete. Load-bearing systems mainly relied on shear walled frames and configurations; (iii) average space utilization across examined cases was 88 %, with variances ranging from 75 % to 95 % among different instances; (iv) average ratio of core area to GFA was 10 %, showing variations between 4 % and 19 % across various scenarios; and (v) there were no substantial variances noted in the effect of different core planning strategies on spatial efficiency. Similar conclusions were drawn regarding building forms and structural materials. Our paper will assist in crafting design principles customized for diverse stakeholders, including architectural designers of timber offices.
Citation - WoS: 3
Citation - Scopus: 3
Spatial Effectiveness in High-Rise Timber Towers: a Global Perspective
(Mdpi, 2024) Ilgin, Huseyin Emre; Aslantamer, Ozlem Nur
High-rise timber structures signify a rising trend, thanks to their significant environmental and economic advantages that occur over their complete lifespan. Enhancing spatial effectiveness in these structures is a critical design consideration for project feasibility. Currently, there has been no comprehensive study on the space efficiency of such towers. This article analyzed 79 cases all over the world to deepen the knowledge of design features shaping spatial efficiency. The critical findings are as follows: (1) the most common architectural preferences include residential function, a centrally located service core, and prismatic arrangements; (2) the preferred structural material is composite, while a shear walled frame system is the favored structural system; (3) the average spatial efficiency and percentage of core area to GFA were recorded at 84% and 10%, ranging from the lowest values of 70% and 4% to the highest values of 95% and 21%, respectively; and (4) no significant differences were detected in the effect of core design approaches on spatial effectiveness if appropriately planned, with similar inferences drawn concerning form and the structural material used. This article will assist in developing design directions for different interested parties, including architectural designers taking part in the advancement of high-rise timber towers.