Evaluation of the effects of service core reduction on tall building structures

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mimarlık Fakültesi, Mimarlık Bölümü, Türkiye

Tezin Onay Tarihi: 2019

Öğrenci: BESTE FAKIOĞLU

Danışman: BEKİR ÖZER AY

Özet:

Optimum design of the service core where the vertical circulation systems, building services, HVAC elements etc. located, is one of the major tasks in tall building design process as it directly effects the net leasable area. Among others, the elevators are one of the most area consuming elements of service core, especially valid for supertall (+300m) office buildings. By making use of developing elevator technologies, decreasing the elevator footprint area and thereby decreasing the service core area is possible, indeed. However, the core of a tall building typically serves as an important member of lateral load resisting system, namely as a structural core. The aim of this study is to investigate the effects of service core reduction due to the elevator footprint decrease. Computer models of typical outriggered frame and framed-tube office buildings with 300m height (75 story) are generated. Then, the strength and stiffness constraints of reduced core buildings have been satisfied by making several modifications such as adding outriggers, using of belt trusses, increasing the section or the number or both of perimeter columns etc. This way, the modified reduced core models having similar structural performance with standard core models in terms of strength and stiffness have been obtained. Thereafter, fundamental architectural aspects such as net leasable area, the obstruction of panoramic exterior view, the amount of structural material etc. of standard core and modified reduced core buildings are compared to investigate the trade-offs of reducing the core.