【摘要】：由于現(xiàn)代高層建筑呈現(xiàn)出質(zhì)量輕、柔性大、阻尼低等特點(diǎn),其對(duì)風(fēng)的敏感性也隨著這一特征的放大而增加,高層建筑(尤其是沿海多臺(tái)風(fēng)地區(qū)的高層建筑)的風(fēng)荷載研究變得越來越重要,風(fēng)荷載已成為高層建筑結(jié)構(gòu)設(shè)計(jì)的主要荷載之一。基于風(fēng)災(zāi)的常年頻發(fā)、高層建筑的飛速發(fā)展、高層建筑對(duì)風(fēng)的敏感性比較大等因素,風(fēng)與結(jié)構(gòu)的相互作用以及高層建筑風(fēng)致響應(yīng)的研究已經(jīng)成為時(shí)下最熱門的研究課題之一。為此,對(duì)沿海地區(qū)的高層建筑開展抗風(fēng)實(shí)測(cè)研究變得很有必要。本文基于沿海某高層建筑在強(qiáng)風(fēng)“天兔”作用下實(shí)測(cè)風(fēng)場(chǎng)風(fēng)壓數(shù)據(jù),對(duì)高層強(qiáng)風(fēng)現(xiàn)場(chǎng)實(shí)測(cè)幾個(gè)基本問題進(jìn)了分析研究,文章主要包括以下內(nèi)容。首先,本文給出了幾種臺(tái)風(fēng)異常數(shù)據(jù)甄別和處理的方法,擇優(yōu)采用格拉布斯方法對(duì)選取的3組異常實(shí)測(cè)風(fēng)速樣本進(jìn)行了處理和分析,主要對(duì)比分析了處理前后數(shù)據(jù)在湍流度、陣風(fēng)因子和功率譜密度函數(shù)3方面的特征,分析結(jié)果表明,在風(fēng)速異常的時(shí)段,相對(duì)應(yīng)的湍流度和陣風(fēng)因子的值,經(jīng)處理后的值較小;功率譜密度函數(shù)在低頻段兩者比較接近,但在高頻段,處理前的譜值明顯要大于處理后的譜值。其次,本文研究了實(shí)測(cè)建筑墻面的風(fēng)壓特性,具體探討分析了各風(fēng)壓測(cè)點(diǎn)的脈動(dòng)風(fēng)壓概率分布特征、脈動(dòng)風(fēng)壓功率譜和風(fēng)壓的相關(guān)性。分析結(jié)果表明,測(cè)點(diǎn)位置、測(cè)點(diǎn)之間的距離、是否位于分離流區(qū)域?qū)︼L(fēng)壓特性有較大影響。最后,基于迎風(fēng)面的風(fēng)場(chǎng)和風(fēng)壓數(shù)據(jù),采用夾角余弦公式分別分析了在不同時(shí)距和不同來流風(fēng)向角條件下,風(fēng)場(chǎng)和風(fēng)壓的相關(guān)性,分析結(jié)果表明,當(dāng)基本時(shí)距取為3s,來流風(fēng)向垂直于結(jié)構(gòu)迎風(fēng)面時(shí),同步實(shí)測(cè)風(fēng)場(chǎng)同風(fēng)壓之間的相關(guān)性比較大。
[Abstract]:Because modern high-rise buildings have the characteristics of light weight, large flexibility and low damping, their sensitivity to wind increases with the amplification of this characteristic. The study of wind load in high-rise buildings (especially in coastal multi-typhoon areas) becomes more and more important, and wind load has become one of the main loads in the structural design of high-rise buildings. Based on the frequent occurrence of wind disasters, the rapid development of high-rise buildings, the sensitivity of high-rise buildings to wind and other factors, the interaction between wind and structure and the wind-induced response of high-rise buildings has become one of the most popular research topics. Therefore, it is necessary to carry out wind resistance measurement of high-rise buildings in coastal areas. Based on the measured wind pressure data of a coastal high-rise building under the action of strong wind "Tianyu", several basic problems of high-rise strong wind field measurement are analyzed and studied in this paper. the main contents of this paper are as follows. First of all, several methods of typhoon anomaly data identification and processing are given in this paper. The Grabbs method is selected to process and analyze the selected three groups of abnormal measured wind speed samples. The characteristics of the data in turbulence, gust factor and power spectral density function before and after processing are mainly compared and analyzed. The analysis results show that the corresponding turbulence degree and gust factor in the period of abnormal wind speed. The value after treatment is small. The power spectral density function is close to each other in the low frequency band, but in the high frequency band, the spectral value before treatment is obviously larger than that after treatment. Secondly, the wind pressure characteristics of the measured building wall are studied in this paper, and the probability distribution characteristics of fluctuating wind pressure at each wind pressure measuring point and the correlation between fluctuating wind pressure power spectrum and wind pressure are discussed and analyzed in detail. The analysis results show that whether the position of the measuring point and the distance between the measuring points are located in the separated flow area has a great influence on the wind pressure characteristics. Finally, based on the wind field and wind pressure data of the upwind surface, the correlation between the wind field and the wind pressure under different time distances and different wind direction angles is analyzed by using the angle cosine formula. The results show that when the basic time distance is 3s and the incoming wind direction is perpendicular to the upwind surface of the structure, the correlation between the synchronous measured wind field and the wind pressure is large.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU973.213

【引證文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 潘月月;臺(tái)風(fēng)作用下高層建筑風(fēng)效應(yīng)的實(shí)測(cè)及風(fēng)洞試驗(yàn)研究[D];湖南大學(xué);2018年

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本文編號(hào)：2499905