In the present paper the structural efficiency of high-rise steel buildings is investigated. Five different structural typologies widely adopted in the European and many other world areas are considered, namely: Moment Resisting Frame [MRF], Concentrically Braced Frame [CBF], Braced Tube [BT], Diagrid Structure [DGR] and Outrigger Structure [OTR]. The structural efficiency is evaluated in terms of total structural weight with respect to slenderness (i.e. height-to-base dimension) ratio. For each typology, the height of a building with a squared plan (21 m x 21 m) is increased and the dimension of steel elements necessary for attaining a predefined level of structural safety are evaluated. Common assumptions are considered with reference to section types of structural elements and external actions. Then, FEM models are employed, and the dimensions of structural steel elements are varied for each structural typology and height to satisfy structural checks. At this purpose, a trial-and-error procedure is followed to optimize the structural configuration. The analyses allowed for defining qualitative "efficiency curves", relating, for each structural typology, the amount of steel weight necessary to ensure the minimum required structural safety.
Structural efficiency of high-rise steel buildings: comparison among different typologies
Gianfranco De Matteis
;Francesco Roselli;Mattia Zizi
2022
Abstract
In the present paper the structural efficiency of high-rise steel buildings is investigated. Five different structural typologies widely adopted in the European and many other world areas are considered, namely: Moment Resisting Frame [MRF], Concentrically Braced Frame [CBF], Braced Tube [BT], Diagrid Structure [DGR] and Outrigger Structure [OTR]. The structural efficiency is evaluated in terms of total structural weight with respect to slenderness (i.e. height-to-base dimension) ratio. For each typology, the height of a building with a squared plan (21 m x 21 m) is increased and the dimension of steel elements necessary for attaining a predefined level of structural safety are evaluated. Common assumptions are considered with reference to section types of structural elements and external actions. Then, FEM models are employed, and the dimensions of structural steel elements are varied for each structural typology and height to satisfy structural checks. At this purpose, a trial-and-error procedure is followed to optimize the structural configuration. The analyses allowed for defining qualitative "efficiency curves", relating, for each structural typology, the amount of steel weight necessary to ensure the minimum required structural safety.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
