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Investigation of Influence of Fishscale Cladding and Aerodynamic Interference on Wind Load and Wind-Induced Response of a Chimney
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摘要: 烟囱的风致效应是设计中不可忽略的控制因素之一。位于武汉市的某矩形截面烟囱（高约100m）采用鱼鳞状覆面装饰,既可以起到装饰的效果,也可能会抑制其风荷载,此外,邻近的厂房（高约50m）也会对烟囱产生显著的气动干扰效应。因此,以刚性模型测压风洞试验为手段,对其风荷载（体型系数）和风振响应（等效静力风荷载）进行研究。研究表明:烟囱覆面的鱼鳞状处理可以明显减小矩形烟囱的迎风面风荷载（体型系数）和横向漩涡脱落效应;临近厂房对烟囱的气动干扰效应非常明显:位于上游时使烟囱迎风面的正压变成负压,位于下游时使烟囱一侧侧风面的负压变成正压,位于一侧时使烟囱靠近的侧风面的负压值变大,甚至因受到厂房的分离流和漩涡脱落的影响使迎风面变成了负压;基于CQC-反演法的顺风向等效静力风荷载与GB5009—2012《建筑结构荷载规范》的方法较接近,而横风向和扭转等效静力风荷载则差别较大。
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关键词:
- 烟囱 /
- 鱼鳞覆面 /
- 刚性模型测压风洞试验 /
- 风荷载 /
- 风振响应
Abstract: The wind-induced effect is one of the important control factors of chimney in design. A chimney with rectangular section (about 100 meters high) located in Wuhan is decorated with fishscale surface, which can not only play a decorative effect, but also restrain its wind load. In addition, an adjacent factory building (about 50 meters high) will also have a significant aerodynamic interference effect on the chimney. Therefore, the wind load (shape factor) and wind-induced response (equivalent static wind load) of the chimney were studied by means of wind tunnel test of rigid model for pressures measured. The research showed that: the fishscale treatment could significantly reduce the windward wind load (shape factor) and the across-wind vortex shedding effect of the chimney; the aerodynamic interference effect of the nearby factory building on the chimney was very obvious: when it was located in the upstream, the wind pressure on the windward side of the chimney became negative; when it was located in the downstream, the negative pressure on the crosswind side of the chimney became positive pressure, when it was located in one side, the negative pressure on the crosswind side near the factory building became larger, and even the windward side became negative pressure due to the influence of the separated flow and vortex shedding of the factory building; the along-wind equivalent static wind load based on CQC inversion method was close to that of Load Code for the Design of Building Structures (GB 5009—2012), while that of across wind and torsion direction were quite different. -
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