Abstract
Abstract Diagrids represent one of the emerging structural systems employed worldwide for the construction of high-rise buildings. Their potential relies on the peculiar architectural effect and their great lateral stiffness. Because of the modular nature of the diagrid triangular element, optimization processes are usually carried out to assess the best arrangement of the external diagonals in order to enhance the structural performance while using the lowest amount of structural material. In this contribution, we make use for the first time of the desirability function approach to investigate the optimal geometry of the dia-grid system. A 168-meter tall building, with four different floor shapes, is analyzed, and the inclination of the external diagonals is varied between 35° and 84°. The desirability function approach is applied to find the most desirable geometry to limit both the lateral and torsional deformability, the amount of employed material as well as the construction complexity of the building. A sensitivity analysis is also carried out to investigate the influence of the individual desirability weight on the obtained optimal geometry. The effect of the building height is finally evaluated, through the investigation of sets of 124-, 210- and 252-meter tall diagrid structures.
Highlights
In the last decades, the realization of tall buildings around the world has experienced an intense growth
Lacidogna et al [12] developed a matrixbased method (MBM) for the structural analysis of diagrid structures, which allows to take into account general geometries
From the results shown above, it is evident how the optimal geometry is only slightly affected by the specific set of weight exponent for the different response variables
Summary
The realization of tall buildings around the world has experienced an intense growth. Zhang et al [9] made use of the stiffness-based methodology for the analysis of diagrid tubes composed of straight diagonals with gradually varying angles, finding the optimal inclination. The same approach was used to investigate the structural performance of diagrid tubes made up of curved diagonals by Zhao and Zhang [10]. The stiffnessbased method was applied by Liu and Ma [11], who proposed a modular method (MM) for the calculation of the bending and shear stiffness of polygonal diagrid tubes. The MBM provides information regarding both the bending, shear, torsional and axial deformability of the whole diagrid building
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