發(fā)布時間：2018-10-08 17:12

【摘要】：對一矩形高層建筑進行剛性模型風洞測壓試驗。首先基于風壓時程的3階矩和4階矩,對不同風向下,矩形高層建筑表面風壓脈動的高斯區(qū)與非高斯區(qū)進行劃分。結果表明,迎風面的非高斯區(qū)主要位于迎風邊緣及角部。在側風面,長邊迎風時,非高斯區(qū)主要集中在迎風前緣附近;短邊迎風時,非高斯區(qū)位于靠近背風邊緣的旋渦再附區(qū)。其次,基于Hermite級數法和改進Hermite級數法,通過參數分析和脈動風壓譜擬合,提出非高斯風壓時程的峰值因子簡化計算方法——三參數Hermite級數法。最后,分別通過風壓時程中的瞬時極值和風壓時程的頻數分布直方圖驗證了Hermite級數法、改進Hermite級數法和三參數Hermite級數法的有效性與準確性。結果表明,與風壓時程中瞬時極值所對應的峰值因子相比,Hermite級數法的計算結果則偏于保守,三參數Hermite級數法、改進Hermite級數法的計算結果與其偏差率均小于10%。此外,三參數Hermite級數法和改進Hermite級數法所給出的概率密度曲線基本重合,且與實際風壓時程頻數分布直方圖的貼合程度較優(yōu),能夠較為準確地反映實際風壓時程的概率密度分布。
[Abstract]:A rigid model wind tunnel test was carried out on a rectangular high-rise building. Firstly, based on the third and fourth moments of the wind pressure history, the Gao Si region and the non-Gao Si region of wind pressure pulsation on the surface of rectangular high-rise building are divided under different wind directions. The results show that the non-Gao Si area on the windward is mainly located at the edge and corner of the windward. On the side wind surface, the non-Gao Si area is mainly located near the front edge of the windward, while on the short side, it is located in the vortex reattachment area near the leeward edge when the long side is upwind. Secondly, based on Hermite series method and improved Hermite series method, through parameter analysis and pulse wind pressure spectrum fitting, a simplified calculation method of peak factor of non-Gao Si wind pressure history, the three-parameter Hermite series method, is proposed. Finally, the validity and accuracy of the Hermite series method and the improved Hermite series method and the three-parameter Hermite series method are verified by the instantaneous extreme value in the wind pressure process and the frequency distribution histogram of the wind pressure time history, respectively. The results show that compared with the peak factor corresponding to the instantaneous extreme value in the wind pressure process, the calculation results of the Hermite series method are conservative, and the calculation results of the three-parameter Hermite series method and the improved Hermite series method and the deviation rate of the modified Hermite series method are less than 10 parts. In addition, the probability density curve obtained by the three-parameter Hermite series method and the improved Hermite series method basically coincides with the actual wind pressure time-history frequency distribution histogram. It can accurately reflect the probability density distribution of the actual wind pressure time history.
【作者單位】： 同濟大學土木工程學院建筑工程系;同濟大學建筑設計研究院(集團)有限公司;
【基金】：國家自然科學基金青年基金項目(51408353) 上海市青年科技啟明星計劃項目(15QB1404800)
【分類號】：TU973

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