（同济大学土木工程防灾国家级重点实验室， 上海 200092）

［摘要］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。

［关键词］风致内压； 背风面开孔； 时程分析

中图分类号： TU311.3 文献标识码： A文章编号：  1002-848X(2016)S2-0200-04

Study on wind-induced internal pressure response of structure with leeward openings

Huang Shunjie, Huang Peng

(State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract: The researches of wind-induced internal pressure response were usuusually focused on the structure with openings on the windward side. The internal pressure response equation for structure with openings on the leeward side considering windward porosity was derived using the Bernoulli equation, the law of mass conservation and the equation of adiabatic gas state. Additionally, influence of factors such as structure volume, external wind pressure frequences on the windward and leeward sides, reference wind speed,the area ratio of windward porosity and leeward openings on internal pressure was discussed through a series of numerical example analyses. Results show that: With the increase of the area ratio of the leeward openings, the vibration frequencies of internal pressure response of structure with openings on the leeward side increase gradually, but the growth rate gradually decreases; The smaller the size of the structure is, the greater the self vibration frequency of the internal pressure response is; When the external pressure frequency is close to the internal frequency of the internal pressure response of the structure, the internal pressure response reaches the maximum value; The external wind pressure frequences on the windward side have a minimal effect on internal pressure response, but the external wind pressure frequences on the leedward side have a great effect; The larger the reference wind speed is, the greater the internal pressure fluctuation is; When the structure with bigger area ratio of porosity on the windward side and smaller area ratio on the leeward side, the mean of the internal pressure will be close to the external windward pressure. Otherwise, it will be close to leeward pressure.

Keywords: wind-induced internal pressure; openings on the leeward; time-history analysis

作者简介： 黄舜杰，硕士研究生，Email:huangshunjie@126.com。

*国家自然科学基金面上项目（51378396）。