Mechanism Investigation on Lateral Displacement Resistance of Diagrid Structures in High-Rise Buildings

LIU Chengqing; WANG Zining; FANG Dengjia; HE Bin

doi:10.3969/j.issn.0258-2724.20200834

Volume 58 Issue 1

Jan. 2023

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Journal of Southwest Jiaotong University > 2023 > 58(1): 227-235.

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LIU Chengqing, WANG Zining, FANG Dengjia, HE Bin. Mechanism Investigation on Lateral Displacement Resistance of Diagrid Structures in High-Rise Buildings[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 227-235. doi: 10.3969/j.issn.0258-2724.20200834

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Mechanism Investigation on Lateral Displacement Resistance of Diagrid Structures in High-Rise Buildings

doi: 10.3969/j.issn.0258-2724.20200834

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Sichuan Provincial Architectural Design and Research Institute Co., Ltd., Chengdu 610095, China
3.
School of Civil Engineering, Kashgar University, Kashgar 844006, China

Received Date: 07 Dec 2020
Rev Recd Date: 19 Jul 2021

Available Online: 25 Oct 2022

Publish Date: 05 Aug 2021

Abstract

Abstract

In order to study the effects of various plane forms on the mechanical performance and stiffness degradation of diagrid outer tube structures, the numerical model of a regular octagonal diagrid structure is verified by the hor-izontal pushover test. Diagrid structures with plane forms of quadrilateral, hexagon, octagon, dodecagon, and icosikaitera (24-gon) are further established. Compared with the quadrilateral framed tube structure model, the effects of plane forms on the lateral stiffness, ductility, internal force, shear lag and yield order are analyzed. Results show that the distribution range of ductility coefficient of various plane diagrid structure models is 4.27–5.22. With the number of plane edges increasing, the overall lateral stiffness increases gradually, and the better the ductility, the more reasonable the stress mechanism. In addition, since the axial force is mainly transmitted through tilted columns in diagrid structures, the shear lag effect of diagrid structures is obviously smaller than that of the frame tube structure. With the increase of the number of plane edges, the shear lag ratio of the compression flange of the diagrid structures decreases from 1.32 to 0.82. The shear lag ratio of diagrid structures with plane forms of regular hexagon, regular octagon, regular dodecagon and regular 24-gon is closer to 1.00 than that with the plane form of regular quadrilateral. In the horizontal pushover test of diagrid structures, the yield first occurred to the tilted column in the intersection area between the flange and the web with increased plastic deformation, then extended to the flange and the middle of web, and finally extended upward from the structure bottom.
- high-rise buildings,
- grid structure,
- pushover test,
- ductility,
- shear lag,
- yield sequence,
- seismic performance

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References(13)

References

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