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对于风致内压响应,之前的研究者主要关注于迎风面开孔情况的研究。本文利用伯努利方程、质量守恒定律和绝热气体状态方程推导了背风面开孔结构的内压响应方程。并通过数值算例分析了结构体积,迎、背风面外压频率,参考风速,迎风面孔隙、背风面开孔率等参数对内压响应的影响。结果表明:开孔结构内压响应的自振频率随背风面开孔率的增加逐渐增加,但增幅逐渐减小;结构体积越小,内压响应的自振频率越大;当背风面外压频率接近结构内压响应自振频率时,内压均值和均方根值达到最大值;内压的均值和均方根值基本不受迎风面外压频率的影响,而受背风面外压频率的影响较大;参考风速越大,内压的均方根值越大;随着迎风面孔隙率越大、背风面开孔率越小,内压的均值更接近于迎风面外压,反之则接近于背风面外压。
For the wind-induced internal pressure response, the previous researchers mainly focused on the windward opening of the case study. In this paper, the Bernoulli equation, the law of mass conservation and the equation of state of adiabatic gas are used to derive the internal pressure response equation of the leeward open-hole structure. Numerical examples are given to analyze the effect of internal volume pressure, such as structure volume, external pressure on leeward and leeward sides, reference wind speed, windward voids and leeward open porosity on internal pressure response. The results show that the natural frequency of internal pressure response of open-hole structure increases with the increase of the open area of leeward surface, but the amplitude decreases gradually. The smaller the structure volume is, the larger the natural frequency of internal pressure response is. When the frequency is close to the natural frequency of internal pressure response, the mean value of internal pressure and root mean square value reach the maximum value. The mean value and root mean square value of internal pressure are basically unaffected by the external windward pressure frequency, The larger the reference wind speed is, the larger the root mean square value of internal pressure is. With the increase of the windward porosity, the smaller the opening ratio of the leeward surface is, the mean of the internal pressure is closer to the windward pressure, and vice versa It is close to the leeward pressure.