扭曲体型高层结构玻璃幕墙风荷载体型系数探讨

董京京

doi:10.13206/j.gjgS24070801

扭曲体型高层结构玻璃幕墙风荷载体型系数探讨

doi: 10.13206/j.gjgS24070801

董京京^1,2

1. 中铁建设集团有限公司, 北京 100040;
2. 中铁建设集团华东工程有限公司, 江苏昆山 215332

基金项目:

四川省科技计划项目(2020YJ0078)。

中铁建设集团有限公司2021年度科技研发计划项目(21-18b)

详细信息

作者简介:
董京京,工程师,一级建造师,主要从事建筑工程施工管理工作。Email:zhibin@scu.edu.cn

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出版历程
- 收稿日期: 2024-07-08

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

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

摘要

摘要: 近年来越来越多的超高层结构为了满足美学、标志性等设计方面的需要,采用更复杂的断面形式(如变截面、倒角断面、断面扭转等)。扭曲外立面体型超高层异形建筑虽具有更高的观赏价值和体验价值,但与此同时给结构分析和建筑施工带来的困难也远远高于传统形式的建筑。玻璃幕墙是一种常用的超高层结构外立面围护结构,在主体构件及连接件设计阶段,设计荷载最为关键,其中尤以设计用风荷载最为复杂。玻璃幕墙风荷载取值主要基于GB 50009—2012《建筑结构荷载规范》中对于围护结构风荷载取值的规定,但GB 50009—2012对于体型系数、阵风系数的取值,仅考虑正多边形情况,且未考虑扭转立面情况。考虑扭转体型及非正多边形相结合的情况,风荷载体型系数的合理取值直接关系到此类结构玻璃幕墙的结构安全及使用性能。依托金华EPC项目工程,针对扭曲体型高层结构外立面异形双层玻璃幕墙,采用计算流体力学CFD(Computational Fluid Dynamics)方法,对扭曲体型高层结构进行流场重构,获取建筑周边流场流动结构的特征,基于数值模拟结果,分析玻璃幕墙风荷载体型系数,并与现行规范取值进行对比。初步研究表明,对于非正八边形典型断面,迎风侧的上、下侧面形成两个明显的能量涡,并且随着时间的推移,这对能量涡沿侧面的长边移动至背风侧,然后又重新在迎风侧形成。相比较,迎风面未发现明显的能量涡,仅在断面长边、短边交界处,发现较小的分离涡。无论是迎风区还是背风区,风荷载最大体型系数、最小体型系数,均与规范中的取值较接近;但侧风区的最大及最小体型系数,均略高于规范取值。
- 扭曲体型高层结构 /
- 玻璃幕墙 /
- 风荷载体型系数
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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参考文献(34)

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