Discussion on Shape Coefficients of Wind Loadings for Glass Curtain Walls of Twisted High-Rise Structures

Jingjing Dong

doi:10.13206/j.gjgS24070801

Volume 40 Issue 1

Jan. 2025

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Jingjing Dong. Discussion on Shape Coefficients of Wind Loadings for Glass Curtain Walls of Twisted High-Rise Structures[J]. STEEL CONSTRUCTION(Chinese & English), 2025, 40(1): 42-51. doi: 10.13206/j.gjgS24070801

Citation:

Jingjing Dong. Discussion on Shape Coefficients of Wind Loadings for Glass Curtain Walls of Twisted High-Rise Structures[J]. STEEL CONSTRUCTION(Chinese & English), 2025, 40(1): 42-51. doi: 10.13206/j.gjgS24070801

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Discussion on Shape Coefficients of Wind Loadings for Glass Curtain Walls of Twisted High-Rise Structures

doi: 10.13206/j.gjgS24070801

Jingjing Dong^1,2

1. China Railway Construction Group Co., Ltd., Beijing 100040, China;
2. China Railway Construction Group East China Engineering Co., Ltd., Kunshan 215332, China

Received Date: 2024-07-08

Abstract

Abstract

In recent years, an increasing number of super high-rise structures have adopted more complex cross-sectional forms (such as variable cross-section, chamfered cross-section, cross-section torsion, etc.) to meet the requirements of aesthetic and iconic design. Although super high-rise irregular buildings with twisted facade have higher ornamental and experiential values, they also bring much greater difficulties to structural analysis and construction than traditional forms of buildings. Glass curtain walls was a commonly-used exterior enclosure structure for super high-rise structures. In the design stage of its main components and connecting parts, the design load is the most critical, especially the wind load used in the design is the most complex. The wind load value of glass curtain walls is mainly based on the provisions of the Code for Load of Building Structures (GB 50009—2012) for the wind load values of enclosure structures. However, the code only considers the shape coefficient and gust coefficient values for regular polygons, and does not take into account the torsional facade situation. The reasonable values of wind load shape coefficients are directly related to the structural safety and performance of such structural glass curtain walls, considering the combination of twisted shapes and non-regular polygons. Based on the Jinhua EPC project, aiming at the special-shaped double-layer glass curtain wall on the facade of the twisted high-rise structure, the computational fluid dynamics (CFD) method was used to reconstruct the flow field of the twisted high-rise building, obtain the characteristics of the flow field structure around the building, analyze the local wind load distribution characteristics of the glass curtain wall and explore its generation mechanism. Based on the numerical simulation results, the shape coefficients of wind loadings were discussed. Preliminary studies had shown that for typical non-regular octagonal cross-sections, two distinct energy vortices were formed on the upper and lower sides of the windward side, and over time, these energy vortices moved along the longer side of the side to the leeward side, and then reformed on the windward side. In comparison, no obvious energy vortices were found on the windward side, and only smaller separated vortices were found at the junction of the long and short sides of the cross-section. Whether in the windward or leeward zone, the maximum and minimum shape coefficients of wind loads were close to the values specified in the specifications; however, the maximum and minimum shape coefficients in the crosswind zone were slightly higher than the standard values.
- twisted high-rise structure,
- glass curtain wall,
- shape coefficients of wind loads

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References(34)

References

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