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(fēng)洞測壓試驗。首先基于風(fēng)壓時程的3階矩和4階矩,對不同風(fēng)向下,矩形高層建筑表面風(fēng)壓脈動的高斯區(qū)與非高斯區(qū)進行劃分。結(jié)果表明,迎風(fēng)面的非高斯區(qū)主要位于迎風(fēng)邊緣及角部。在側(cè)風(fēng)面,長邊迎風(fēng)時,非高斯區(qū)主要集中在迎風(fēng)前緣附近;短邊迎風(fēng)時,非高斯區(qū)位于靠近背風(fēng)邊緣的旋渦再附區(qū)。其次,基于Hermite級數(shù)法和改進Hermite級數(shù)法,通過參數(shù)分析和脈動風(fēng)壓譜擬合,提出非高斯風(fēng)壓時程的峰值因子簡化計算方法——三參數(shù)Hermite級數(shù)法。最后,分別通過風(fēng)壓時程中的瞬時極值和風(fēng)壓時程的頻數(shù)分布直方圖驗證了Hermite級數(shù)法、改進Hermite級數(shù)法和三參數(shù)Hermite級數(shù)法的有效性與準確性。結(jié)果表明,與風(fēng)壓時程中瞬時極值所對應(yīng)的峰值因子相比,Hermite級數(shù)法的計算結(jié)果則偏于保守,三參數(shù)Hermite級數(shù)法、改進Hermite級數(shù)法的計算結(jié)果與其偏差率均小于10%。此外,三參數(shù)Hermite級數(shù)法和改進Hermite級數(shù)法所給出的概率密度曲線基本重合,且與實際風(fēng)壓時程頻數(shù)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(fēng)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(xué)土木工程學(xué)院建筑工程系;同濟大學(xué)建筑設(shè)計研究院(集團)有限公司;
【基金】：國家自然科學(xué)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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本文編號：2257596