Calculation model of the lateral stiffness of high-rise diagrid tube structures based on the modular method

Liu, Chengqing; Ma, Kaiqiang

doi:10.1002/tal.1333

Cited by 33 publications

(15 citation statements)

References 11 publications

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“…The diagrid module resists overturn moment by the axial force of diagonals, as shown in Figure 17. Liu et al [11] derived the overturn moment of each diagonal as follows:…”

Section: Preliminary Design Methodologymentioning

confidence: 99%

“…They found that the design of diagrid structures should be primarily based on strength criteria when the diagonal angle is small and stiffness criteria when the diagonal angle is large. Liu and Ma [11] proposed a method for calculating lateral stiffness of diagrids of arbitrary polygonal plane, and the cross-section of diagonals were determined based on stiffness. Angelucci and Mollaioli [12] examined Moon's stiffness-based methodology; they found that the methodology was effective in determining the optimal section size only for the diagonal angle range of 60 -70 .…”

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confidence: 99%

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Lateral stiffness and preliminary design methodology of twisted diagrid tube structures

Song

Zhang

2020

Structural Design Tall Build

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Twisted forms have been widely employed in high-rise buildings in recent years. The diagrid structural system is particularly suitable for twisted buildings because of its large lateral stiffness and unique architectural esthetics, but little research on twisted diagrid tube structures is currently available. This paper studies the influence of diagonal angle, twist rate, aspect ratio, corner column, and plan form on the lateral stiffness of twisted diagrids, and the optimal diagonal angle range is determined. Considering the stiffness and strength criteria, the design methodology of diagonal sizes of twisted diagrids is proposed, and the methodology is validated by finite element analysis. In addition, this paper presents a novel configuration of twisted diagrid, that is, the twisted diagrid with asymmetric diagonal angles. The influence of the left-and right-inclined diagonal angle on the lateral stiffness of twisted diagrids is investigated. It is found that twisted diagrid structure with asymmetric diagonal angles exhibits larger lateral stiffness than the symmetric case. The results in this paper are useful for engineers to determine the configuration and diagonal sizes of the twisted diagrid tube structures.

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“…The diagrid module resists overturn moment by the axial force of diagonals, as shown in Figure 17. Liu et al [11] derived the overturn moment of each diagonal as follows:…”

Section: Preliminary Design Methodologymentioning

confidence: 99%

mentioning

confidence: 99%

Lateral stiffness and preliminary design methodology of twisted diagrid tube structures

Song

Zhang

2020

Structural Design Tall Build

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“…The same approach was also used to investigate the structural performance of diagrid tubes made up of curved diagonals by Zhao and Zhang [10]. The stiffnessbased method was also 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. More recently, Lacidogna et al [12] developed a matrixbased method (MBM) for the structural analysis of diagrid structures, which allows to take into account general geometries.…”

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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“…Unstiffened tubular joints, brace and chord tube members are often treated by directly welding the braces to the surface of the chords, have been widely used in engineering structures [1,2] due to fabricate simple, cost-effective and aesthetically appealing. However, their ultimate capacity is low relatively.…”

Section: Introductionmentioning

confidence: 99%

Effects of Out-of-plane Brace-to-chord Angle on Multiplane CHS X-joints Behavior Under Brace Compression

Zhao¹,

Li²,

Liu³

et al. 2019

Period. Polytech. Civil Eng.

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Multiplanar CHS X-joints, different from the common uniplanar CHS X-joints, usually with a relative small out-of-plane brace-to-chord angle (OPBCA) for appealing architectural appearance in the single layered lattice structures. In order to study the effects of OPBCA on the static behavior of circular hollow section (CHS) X-joints under brace axial compression, experimental tests and numerical parametric study on the ultimate capacity and load transfer pattern of the CHS X-joints were carried out. The numerical analysis results had good consistent with experimental tests in terms of the capacity and fail mode of the X-joints. OPBCA changes the load transfer pattern to more load at the up saddle point from the same load at the up and bottom saddles in uniplanar X-joints, and more obvious for the X-joints with lager OPBCA. OPBCA is also unfavorable to the capacity, especially the X-joints with relative large braceto-chord diameter ratio and in-plane brace-to-chord angle. Then an equation considering the OPBCA influence factor, extended the capacity prediction formulae of uniplanar X-joints in the current specifications to the multiplanar X-joints, is also established; and the equation has been validated favorably. KeywordsCHS X-joints, out-of-plane brace-to-chord angle (OPBCA), load transfer pattern, ultimate capacity, OPBCA influence factor

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Calculation model of the lateral stiffness of high-rise diagrid tube structures based on the modular method

Cited by 33 publications

References 11 publications

Lateral stiffness and preliminary design methodology of twisted diagrid tube structures

Lateral stiffness and preliminary design methodology of twisted diagrid tube structures

Optimization of diagrid geometry based on the desirability function approach

Effects of Out-of-plane Brace-to-chord Angle on Multiplane CHS X-joints Behavior Under Brace Compression

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