考虑背景孔隙的单开孔两空间结构的风致内压响应研究

Study on the responses of wind-induced internal pressure for building with internal partitioning and openings when considering background porosity

风致内压对建筑结构的安全性有着显著的影响,在结构抗风设计时不容忽视。本文基于合理的假定,利用非定常伯努利方程、质量守恒定律和绝热气体状态方程推导了有背景孔隙的单开孔两空间结构的内压响应非线性控制方程组,并通过数值算例分析了背景孔隙对内压响应的影响。结果表明:本文导出的内压控制方程组可很好地分析有背景空隙的单开孔两空间结构的风致内压响应;无背景孔隙时,内侧房间的内压响应要高于外侧房间;背景孔隙所引入的附加阻尼使得两房间的内压响应均受到抑制。这些研究成果对结构风致内压有理论与实际应用的价值。

The wind-induced pressure inside buildings has a profound effect on building safety, it can＇t be ignored in the wind-resistant design. Base on some reasonable assumptions, the governing equations of internal pressures for building with internal partitioning and openings are derived by the application of the unsteady form of Bernoulli equation, law of mass conservation and adiabatic law, when its background porosity is considered. Influence of the background porosity to internal pressure responses are analyzed from numerical method. The studies results show that wind-induced internal pressure responses of building with internal partitioning and openings can be predicted and analyzed by the governing equations derived in this paper; the internal pressure response in the compartment without an external opening is much higher than that for the other compartment when there is no background porosity; the internal pressures responses in both the compartments are suppressed because of the additional damp of background porosity. All the study achievements can have theoretical and practical values on internal pressure of structures.