中文摘要：

为准确测得单一开孔建筑内压脉动响应，采用相似性准则推导出模型内部容积应该按照原型和模型风速比的平方进行调节的结论。通过在转盘底部增加大容积空腔来实现对不同模型内部容积的调节。对不同开孔下某厂房模型分别在容积调整前后进行风洞试验并将模型试验结果与原型数值解进行比较，考察了底部空腔与模型连接处连通口大小对试验结果的影响。研究结果表明：如果不对模型容积进行调整会高估结构的Hehnholtz频率，而低估开孔阻尼比。采用上述模型内部容积调节方法则可以在风洞试验中准确测定内压脉动。底部空腔与模型连接处开孔较小时会形成双腔共振，导致所测得的内压脉动均方根偏大。随着连通开口的增大，双自由度振动将逐渐减弱并转变为单自由度振动体系。

英文摘要：

To accurately achieve the fluctuating response of internal pressure inside a building with a dominant opening, the similarity theory was employed to derive the conclusion that the internal volume of a model should be adjusted according to the square of prototype/model wind velocity ratio. By attaching a big cavity under the turntable, internal volume of different models can be adjusted properly. Wind tunnel tests were applied to a plant model with different opening sizes before and after internal volume was changed respectively, and internal pressure measured by the test model was compared with the one predicted by the plant prototype. Meanwhile, the effect of the size of opening at the connection of model bottom cavity on internal pressure fluctuation was also investigated. The study shows that models without additional volume will overestimate Helmholtz resonant frequency, but under-predict damping ratio. Using the proposed volume adjustment method, fluctuation in internal pressure can be accurately predicted through wind tunnel experiments. Two resonant peaks are observed when there is a small opening in connected surface, which produces bigger internal pressure R. M. S. However, with the increase of the connection opening size, two DOFs oscillation decays and eventually it turns into single DOF oscillation.