内外压作用下平板网架结构风致响应影响参数分析

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (16) : 176-182.

论文

余先锋1,2，顾明3，谢壮宁1

作者信息 +

Parameters analyses on wind-induced responses for plate type truss structures under action of internal and external pressures

YU Xian-feng1，2,GU Ming3，XIE Zhuang-ning1

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摘要

在均匀风场中对平屋面结构进行内外压同步测量风洞试验。由内压功率谱分析认为，该试验须严格遵守内压相似定律以获得正确的Helmholtz共振频率。在此基础上将平屋面结构设计成典型平板网架结构，并进行内外压作用下屋盖风致响应分析，研究开洞面积、背景孔隙、风向角及结构阻尼比等参数对屋盖竖向位移响应影响。结果表明，增大开洞面积及减小背景孔隙，屋盖竖向位移均方根值呈增大趋势；结构阻尼比对屋面竖向位移影响极小；迎风开洞时屋盖竖向位移远大于其它风向；脉动内压对屋盖位移响应贡献主要体现于背景分量。

Abstract

Internal and external pressures for a flat roof structure were tested in uniform wind field by applying the synchronous pressure measurement technique. To obtain the accurate Helmholtz resonance frequency, the scaling requirement of internal pressure should be ensured. Then the flat roof structure were designed as a typical plate type truss structure, and the effects of opening area, background porosity, wind direction and damping ratio on the vertical displacement of roof were analyzed. Results showed that the root-mean-square value of vertical displacement increases with increased opening area and with decreased background porosity. Damping ratio has nothing to do with the roof displacement response. The vertical displacement in the case of windward opening is significantly larger than the case of in the other wind direction. The contribution of fluctuating internal pressure on roof displacement response is mainly attributed to background component.

导出引用

余先锋1，2,顾明3，谢壮宁1. 内外压作用下平板网架结构风致响应影响参数分析[J]. 振动与冲击, 2015, 34(16): 176-182

YU Xian-feng1，2,GU Ming3，XIE Zhuang-ning1. Parameters analyses on wind-induced responses for plate type truss structures under action of internal and external pressures[J]. Journal of Vibration and Shock, 2015, 34(16): 176-182

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