摘要
为了研究建筑迎风墙面多开孔情况下的风致内压响应动力特性，由非定常伯努利方程推导了多开孔情况下内压控制方程，通过方程线性化得到了系统的等效阻尼比。对迎风面开孔面积相同的单一开孔和双开孔模型分别进行了6种不同容积下的风洞试验。研究结果表明：所推导的方程能较好的预测内压脉动。随着模型容积增加内压均值变化不大，而内压共振频率降低及等效阻尼比增加。与单一开孔相比，双开孔会增加Helmholtz共振频率以及等效阻尼比，所以在大部分风向角下，双开孔模型内外压脉动均方根之比要小于单一开孔工况。单、双开孔两种工况的最大内外压脉动均方根之比分别出现75°和60°斜风向下。
Abstract
In order to understand wind-induced dynamic characteristic of internal pressure response for a building with multiple openings in windward wall, unsteady form of Bernoulli equation was applied to deduce internal pressure governing equation for this multiple opening situation and equivalent damping ratio was derived through linearization of the governing equation. Models with single and double openings in windward wall were investigated in wind tunnel, respectively. For each opening case, internal pressure was measured for six different internal volumes. The study shows the governing equation is of high precisions in predicting internal pressure fluctuation. Increased internal volume will lead to lower resonance frequency and larger damping ratio of internal pressure, but has little effect on mean internal pressure. When compared with single opening case, double opening enlarges both Helmholtz frequency and equivalent damping ratio, therefore R.M.S ratios between internal and external pressure in double opening model is smaller than single opening situation at most wind azimuths. However, the maximum R.M.S ratios of internal to external pressure for single and double opening models are found at wind angles of 75° and 60°, respectively.
关键词
开孔结构 /
内压响应 /
迎风面多开孔 /
风洞试验 /
等效阻尼比
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Key words
opening structure /
internal pressure response /
multiple openings in windward wall /
wind tunnel test /
equivalent damping ratio
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徐海巍;余世策;楼文娟.
迎风墙面多开孔结构风致内压的试验研究[J]. 振动与冲击, 2014, 33(15): 82-86
XU Hai-wei;YU Shi-ce;LOU Wen-juan.
Experimental study on wind-induced internal pressure for a building with multiple openings in windward wall[J]. Journal of Vibration and Shock, 2014, 33(15): 82-86
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