Interrelations of slenderness ratio and main design criteria in supertall buildings

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A study on space efficiency in contemporary supertall mixed-use buildings

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Review on Supertall Building Forms

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Use of aerodynamically favorable tapered form in contemporary supertall buildings

Today, supertall buildings can be constructed in unusual forms as a pragmatic reflection of advances in construction techniques and engineering technologies, together with advanced computational design tools for architectural design. As with many other buildings, architectural and practical principles play a crucial role in the form of a supertall building, where aerodynamic behavior shaped by wind-induced excitations also becomes a critical design input. Various methods are used to meet the functional needs of these towers and reduce excitations, including aerodynamic modification methods directly related to the building form. Tapered forms are one of the most frequently used and most effective methods in today's skyscrapers, which significantly affect architectural design. To date, no study has been conducted in the literature that provides an understanding of the interrelationships between tapered building forms and main planning criteria, considering the aerodynamic design concerns of the tapering effect in supertall buildings (≥300 m). This important issue is explored in this article with data gathered from 41 supertall case studies, considering location, function, structural system, and structural material as well as the aerodynamic taper effect. The main findings of the study highlighted the following: (1) Asia was where tapered towers were most favored, with a wider margin in all regions; (2) mixed-use was the most preferred function in selected supertall buildings with tapered form; (3) outriggered frame systems were mainly used; (4) tapered supertall cases were mostly built in composite; (5) the sample group included 17 cases that used the tapering effect with aerodynamic design concerns, some of which were accompanied by corner modifications. It is believed that this study will be a basic guide for design and construction professionals including architectural and structural designers, and contractors.publishedVersionPeer reviewe

Space Efficiency in Contemporary Supertall Office Buildings

Space efficiency in supertall buildings (300m+) is one of the most critical design parameters to make a project feasible. This issue becomes even more important in office buildings where the ability to increase rental income is a crucial indication of proper planning. This study analyzed space efficiency in contemporary supertall office buildings. Data were collected from the 44 buildings through literature surveys and the case study method to examine space efficiency and main architectural and structural parameters affecting it to contribute to designing more feasible office towers. The main findings of this study indicated that: (1) central core was the most preferred type; (2) frequent use of free and tapered forms were identified; (3) composite use was dominant over steel and concrete utilization; (4) the most used structural system was the outriggered frame system; (5) space efficiency decreased as the height of building increased, where core area and planning were the most decisive factors; and (6) when groups of building form were compared with each other, no significant differences were identified among their effects on space efficiency and similar results were valid for structural systems. This study aids and directs architects in the sound planning and development of supertall office projects.acceptedVersionPeer reviewe

Massive Wood Construction in Finland: Past, Present, and Future

Finland has a long history of massive wood construction such that the log construction technique has been used as a traditional method of Finnish residential construction for thousands of years, and the entire history of Finnish architecture is based on this technique. Today, almost all leisure buildings, for example, cottages in Finland are made of wood and mostly log construction. Also, today 90% of Finland’s detached houses have timber frames, and a quarter of them are made from industrial glue logs. Apartment buildings began to be made of wood, especially cross-laminated timber (CLT) and laminated veneer lumber (LVL). The most common way of constructing wooden apartments is to use volumetric elements as compared to load-bearing large elements and post-beam systems. The increase in environmental awareness in Finland, as in many European countries today, strengthens the popularity of wood construction, and this brings the search for innovative and environmentally friendly engineered wood product solutions (e.g., dovetail massive wood board elements) as a future vision. The chapter aims to identify, combine, and consolidate information about massive wood construction in Finland from past, present, and future perspectives. This study will assist and guide Finnish key professionals in the design and implementation of timber buildings.publishedVersionPeer reviewe

Freeform Supertall Buildings

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Tallest Timber Buildings: Main Architectural and Structural Design Considerations

Since the end of the twentieth century, the question of how to deal with the increasing scarcity of resources has been at the center and the need for renewable materials has come to the fore, especially in the construction sector. A possible solution to these environmental challenges is represented by the development of engineered timber products, which allowed the realization of tall timber structures. Their main drivers are decarbonization, forest management, and timber life cycle, urbanization, and densification, productivity in the construction industry, and the benefits of using timber indoors. In this context, this chapter will analyze data from the 10 tallest timber building cases to enhance the understanding of contemporary trends. Data are collected through literature surveys and case studies to analyze the main architectural and structural design concerns to contribute to the knowledge about the growing tall timber structures around the world. By revealing up-to-date features of the tallest timber towers, it is thought that this chapter will contribute to aiding and directing key construction professionals such as architects, structural engineers, and contractors, in the design and construction of future tall timber build-ing developments.publishedVersionPeer reviewe

Log Construction Practices and Future Outlook: Perspectives of Finnish Experts

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A rare intraabdominal tumor : giant hepatic artery aneurysm

A 55-year-old man was investigated for right upper abdominal quadrant pain. He had No history of abdominal trauma or surgery. Imaging studies showed a common hepatic artery aneurysm involving the gastroduodenal artery. Following aneurysmectomy, examination with a hand Doppler apparatus yielded clear arterial signals from the liver surface. Therefore, vascular reconstruction was not performed. He had an uneventful postoperative course