Diagrid systems coupled with closed- and open-section shear walls: Optimization of geometrical characteristics in tall buildings

Lacidogna, Giuseppe; Nitti, Giuseppe; Scaramozzino, Domenico; Carpinteri, Alberto

doi:10.1016/j.promfg.2020.02.277

Cited by 15 publications

(15 citation statements)

References 19 publications

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“…The GA has been developed by some of the authors in the last decades and allows to investigate the structural behavior of three-dimensional buildings made up of several vertical resisting elements, such as frames, tubes and shear walls [9][10][11][12]. Very recently, we have inserted the MBM within the GA environment in order to perform the structural analysis of an external diagrid tube coupled with internal shear walls [13].…”

Section: Introductionmentioning

confidence: 99%

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Diagrid System Coupled With Shear Walls: Analytical Investigation on the Dynamical Response in Tall Buildings

Lacidogna¹,

Nitti²,

Scaramozzino³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Diagrids are tubular structural systems made up of mega-diagonals arranged in a triangular or tetrahedral pattern, which are placed all over the external surface of the building and usually span across several floors. In the last two decades, diagrids have experienced a remarkable development as efficient structural systems in tall building design and construction. This was mainly due to their high lateral stiffness, capability to realize complex-shaped structures and obtain impressive aesthetic results, flexibility of the external diagonals' layout, etc. The structural analysis of these systems is usually carried out by the Finite Element Method (FEM) or by numerical calculations based on simplified assumptions. Recently, we developed a matrix-based method (MBM) to perform the structural analysis of diagrid systems under static forces. The MBM was then coupled with an analytical formulation developed in the past years by some of the authors, the so-called General Algorithm (GA), in order to study the structural response of an external diagrid tube coupled with an internal shear wall under lateral and torque static actions. The study allowed to investigate the influence of the diagonal inclination on the lateral and torsional flexibility of the diagrid-core system. In the past years, the analytical formulation of the GA was also made suitable to analyze the response of threedimensional tall building in the dynamic regime. In this contribution, we show new results regarding the dynamical behavior of an external diagrid structural system coupled with an internal shear wall, as obtained from the GA calculations. Modal analysis was carried out in order to obtain the natural frequencies and mode shapes of the tall building, and the influence of the diagonal inclination on the results was also investigated. Moreover, by applying different harmonic oscillations at different frequencies at the base of the building, the damped dynamical response of the different diagrid-core systems was investigated.

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Section: Introductionmentioning

confidence: 99%

“…Various diagonal layouts have been proposed in the following years and the corresponding building efficiency under lateral loads has been investigated [15][16][17][18]. Attention has also been paid to torsional actions and the role that these might have in the parametric investigation of the diagrid structural response [13].…”

Section: Introductionmentioning

confidence: 99%

Diagrid System Coupled With Shear Walls: Analytical Investigation on the Dynamical Response in Tall Buildings

Lacidogna¹,

Nitti²,

Scaramozzino³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…More recently, Lacidogna et al [20] made use of the previously developed MBM in order to explore both the lateral and torsional behavior of diagrid structures, by changing the floor shape and the inclination of the external diagonals. The MBM was also recently used to analyze the effect that an internal closed-or open-section concrete core has on the global building response [21].…”

Section: Introductionmentioning

confidence: 99%

“…However, in recent studies it was shown that other responses characterize the structural behavior of the diagrid and might then influence the choice of the optimal solution. For example, Lacidogna et al [20,21] recently showed that the optimal diagrid geometries that minimize the lateral deflection of the building are not the same that allow to minimize the torsional rotations. The latter is minimum when the diagonals are very shallow, whereas the former gets minimized when the diagonal inclination lies in an intermediate range that depends on the building aspect ratio [20].…”

Section: Introductionmentioning

confidence: 99%

Optimization of diagrid geometry based on the desirability function approach

Lacidogna

Scaramozzino

Carpinteri

2020

Curved and Layered Structures

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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.

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“…Different geometrical patterns for diagrid structures were also explored by Tomei et al [8] by performing an optimization process based on weight minimization using genetic algorithms. In the contribution of Lacidogna et al [9] the analysis of external diagrid systems coupled with closed-section and open-section shear walls was performed by recurring to the General Algorithm [10] for the assessment of displacements and stresses [11,12].…”

Section: Introductionmentioning

confidence: 99%

A New Modular Structural System for Tall Buildings Based on Tetrahedral Configuration

2020

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Inspired by the high mechanical performance of diagrid structures, the minimization of material consumption on braced tubes and the expressive potency of tensegrity modular structures, this work proposes an innovative three-dimensional system for tall buildings. A new modular structural system generated from the assembly of tetrahedral units is investigated. The paper integrates insights on the architectural implications and mechanical performance of the reticular system arranged in repetitive triangular-based modules. The impact of different geometric configurations of the structural members on the economic design is also discussed and recommendations for the optimal topology are made. Guidelines for the design and analytical formula for accessing preliminary member sizes are proposed on the basis of stiffness requirements.

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Diagrid systems coupled with closed- and open-section shear walls: Optimization of geometrical characteristics in tall buildings

Cited by 15 publications

References 19 publications

Diagrid System Coupled With Shear Walls: Analytical Investigation on the Dynamical Response in Tall Buildings

Diagrid System Coupled With Shear Walls: Analytical Investigation on the Dynamical Response in Tall Buildings

Optimization of diagrid geometry based on the desirability function approach

A New Modular Structural System for Tall Buildings Based on Tetrahedral Configuration

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