- 摘 要
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（同濟大學土木工程防災國家級重點實驗室， 上海 200092）
［摘要］對于風致內壓響應，之前的研究者主要關注于迎風面開孔情況的研究。本文利用伯努利方程、質量守恒定律和絕熱氣體狀態(tài)方程推導了背風面開孔結構的內壓響應方程。并通過數(shù)值算例分析了結構體積，迎、背風面外壓頻率，參考風速，迎風面孔隙、背風面開孔率等參數(shù)對內壓響應的影響。結果表明：開孔結構內壓響應的自振頻率隨背風面開孔率的增加逐漸增加，但增幅逐漸減??；結構體積越小，內壓響應的自振頻率越大；當背風面外壓頻率接近結構內壓響應自振頻率時，內壓均值和均方根值達到最大值；內壓的均值和均方根值基本不受迎風面外壓頻率的影響，而受背風面外壓頻率的影響較大；參考風速越大，內壓的均方根值越大；隨著迎風面孔隙率越大、背風面開孔率越小，內壓的均值更接近于迎風面外壓，反之則接近于背風面外壓。
［關鍵詞］風致內壓； 背風面開孔； 時程分析
中圖分類號： TU311.3 文獻標識碼： A文章編號： 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
作者簡介： 黃舜杰，碩士研究生，Email:huangshunjie@126.com。
*國家自然科學基金面上項目（51378396）。
