建筑物周围风致静压场的分布及振动特性研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (14) : 1-10.

论文

建筑物周围风致静压场的分布及振动特性研究

罗尧治1，孙斌1,2，洪江波3

作者信息 +

Distribution and vibration characteristics of wind-induced static pressure field around a building

LUO Yao-zhi1, SUN Bin1,2, HONG Jiang-bo3

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文章历史 +

摘要

对均匀流及湍流中风洞内有和无建筑物时的静压状况进行了研究，针对目前无法精确测量静压的情况，提出了一种无量纲化方法，给出了静压场的分布规律，运用幅值域及频域方法详细分析了建筑物周围各区域的流场特性，之后给出了静压场主要方向的分布函数型式，并推断了静压场的静力及动力边界。研究结果显示：在风洞中进行风压测试时，有可能激发风洞气柱自振模态并对测试结果产生误导；建筑物迎风区脉动主要取决于来流脉动；背风区脉动则与湍流来流脉动较为相像，但能引起更多非高斯特性；地面粗糙度由小变大时，建筑物侧风区脉动由小振幅周期振动向大振幅随机振动转变；地面粗糙度越大，静压场的静力作用越小而动力作用越大。本文提出的静压场分布函数可对风工程实测参考静压的测试及建筑群体的风致干扰问题提供参考。

Abstract

Wind tunnel tests in smooth and turbulent flow, with and without a building were carried out to detect static pressure fields in this paper. A dimensionless method is proposed to solve the problem that static pressure can hardly be measured exactly, therefore the distributions of static pressure fields are investigated, dynamic characteristics of different flow areas around a building are analyzed in details by amplitude domain and frequency domain analysis methods, distribution formulas of main directions are given, and then the static and dynamic boundaries are concluded. The tests indicate that the natural modes of the gas column in the wind tunnel may be evidently excited in some work conditions and then test results may be misled; fluctuating in windward area depends on velocity fluctuating of approach flow; fluctuating in leeward area is close to static pressure fluctuating in turbulent approach flow but there are more non-Gaussian characteristics in leeward area; periodic vibration of static pressure turns to be random vibration with larger amplitude in crosswind area with rising of surface roughness; the more rough surface is, the smaller static action and the bigger dynamic action of whole static pressure field will be. The distribution formulas can be used for many purposes such as measuring the reference static pressure in full-scale filed experiments and investigating wind-induced interference effect among buildings.

导出引用

罗尧治;孙斌;洪江波. 建筑物周围风致静压场的分布及振动特性研究[J]. 振动与冲击, 2013, 32(14): 1-10

LUO Yao-zhi;SUN Bin;HONG Jiang-bo. Distribution and vibration characteristics of wind-induced static pressure field around a building[J]. Journal of Vibration and Shock, 2013, 32(14): 1-10