【摘要】：隨著科技水平的不斷進(jìn)步以及城市的快速發(fā)展,現(xiàn)代高層建筑朝著更高、更輕、更柔的趨勢發(fā)展,結(jié)構(gòu)的自振頻率接近于自然風(fēng)的卓越頻率。高層建筑自振周期變長、結(jié)構(gòu)阻尼變小致使高層建筑結(jié)構(gòu)對風(fēng)荷載敏感,風(fēng)荷載逐漸成為控制高層建筑安全性、舒適性和經(jīng)濟(jì)性的重要影響因素。測壓管路系統(tǒng)對脈動壓力信號有阻尼作用,脈動風(fēng)壓經(jīng)過管路系統(tǒng)會發(fā)生信號畸變,目前分析測壓管路系統(tǒng)對高層建筑風(fēng)荷載影響的研究較少。因此本文對測壓系統(tǒng)測得的不同測壓管長的高層建筑對風(fēng)荷載特性進(jìn)行了深入的分析和探討,主要的研究成果如下:詳細(xì)介紹測壓管路系統(tǒng)的理論,基于流體管道的耗散模型分析風(fēng)洞試驗(yàn)中測壓管路系統(tǒng)的頻響函數(shù),通過測定試驗(yàn)獲得不同測壓管長的真實(shí)頻響函數(shù)并驗(yàn)證理論模型的精確性,并對頻響函數(shù)的幅頻特性曲線和相位特性曲線隨頻率變化進(jìn)行研究,進(jìn)一步利用頻響函數(shù)在時(shí)域和頻域兩方面對脈動風(fēng)壓的畸變信號進(jìn)行修正。對不同測壓管長的高層建筑開展了剛性模型的同步測壓試驗(yàn),詳細(xì)研究了各管路模型表面的風(fēng)壓分布特性、脈動風(fēng)壓特性和峰值風(fēng)壓以及測壓管路對風(fēng)壓特性的影響。管路的長短對平均風(fēng)壓影響較小,對脈動風(fēng)壓影響較大,管路越長,脈動風(fēng)壓衰減得越快。從時(shí)域和頻域兩種角度探討各管路模型的脈動風(fēng)壓相關(guān)性和相干性,并對脈動風(fēng)壓功率譜進(jìn)行研究。采用目標(biāo)概率法求出峰值因子并對各管路模型的峰值風(fēng)壓進(jìn)行研究。研究三分力系數(shù)幅值和頻域特性、相干函數(shù)以及測壓管路對風(fēng)荷載特性的影響。以測壓管長為基本變量,利用最小二乘法建立了三分力系數(shù)幅值的擬合公式。對測壓管長進(jìn)行二次擬合,分別建立了適合于不同測壓管長的矩形高層建筑順風(fēng)向、橫風(fēng)向和扭轉(zhuǎn)向風(fēng)荷載的數(shù)學(xué)模型,同時(shí)建立了順風(fēng)向、橫風(fēng)向及扭轉(zhuǎn)向的相干函數(shù)的數(shù)學(xué)模型,擬合結(jié)果與試驗(yàn)結(jié)果吻合較好。研究測壓管路對高層建筑等效風(fēng)荷載及風(fēng)致加速度的影響。介紹陣風(fēng)荷載因子法(GLF法)、慣性風(fēng)荷載法(GBJ)、基底陣風(fēng)荷載因子法(MGLF)以及基于隨機(jī)振動理論的風(fēng)振響應(yīng)分析方法。通過隨機(jī)振動理論對風(fēng)洞試驗(yàn)數(shù)據(jù)進(jìn)行分析,得到各管路模型的等效靜力風(fēng)荷載和頂部峰值加速度,并將風(fēng)洞試驗(yàn)結(jié)果與中日規(guī)范計(jì)算結(jié)果進(jìn)行比較。
[Abstract]:With the development of science and technology and the rapid development of cities, modern high-rise buildings tend to be higher, lighter and softer. The natural vibration frequency of the structure is close to that of natural wind. The natural vibration period of high-rise building becomes longer and the damping of structure becomes smaller, which makes high-rise building structure sensitive to wind load. Wind load gradually becomes an important factor to control the safety, comfort and economy of high-rise building. The pressure measuring pipeline system has damping effect on the pulsating pressure signal, and the signal distortion will occur when the pulsating wind pressure passes through the pipeline system. At present, there is little research on the influence of the pressure measuring pipeline system on the wind load of the high-rise building. Therefore, in this paper, the characteristics of wind load in high-rise buildings with different pressure pipe lengths measured by pressure measurement system are deeply analyzed and discussed. The main research results are as follows: the theory of pressure measuring pipe system is introduced in detail. Based on the dissipative model of fluid pipeline, the frequency response function of pressure measuring pipeline system in wind tunnel test is analyzed. The real frequency response function of different pressure measuring pipe length is obtained by measuring test, and the accuracy of the theoretical model is verified. The amplitude-frequency characteristic curve and phase characteristic curve of the frequency response function are studied. The frequency response function is further used to modify the distortion signal of the fluctuating wind pressure in the time domain and frequency domain. In this paper, synchronous pressure measurement tests with rigid models are carried out for high-rise buildings with different manometric lengths. The distribution characteristics of wind pressure on the surface of each pipe model, the characteristics of fluctuating wind pressure and peak wind pressure, and the influence of pressure measuring pipes on wind pressure characteristics are studied in detail. The length of pipeline has little effect on the average wind pressure, but greater influence on the pulsating wind pressure. The longer the pipeline is, the faster the pulsating wind pressure attenuates. The correlation and coherence of the pulsating wind pressure of each pipeline model are discussed from the perspectives of time domain and frequency domain, and the power spectrum of pulsating wind pressure is studied. The peak factor is calculated by the method of target probability and the peak wind pressure of each pipeline model is studied. The effects of amplitude and frequency domain characteristics of the three-point force coefficient, coherence function and pressure measuring pipeline on the wind load characteristics are studied. The fitting formula of the amplitude of the three-point force coefficient is established by using the least square method with the tube length as the basic variable. According to the secondary fitting of the pressure measuring pipe length, the mathematical models of downwind, crosswind and torsional wind loads of rectangular high-rise buildings suitable for different manometric pipe lengths are established respectively, and the downwind direction is also established. The mathematical model of the coherent function of transverse wind direction and torsional direction is in good agreement with the experimental results. The effect of pressure-measuring pipe on equivalent wind load and wind-induced acceleration of high-rise buildings is studied. The wind load factor method (GLF method), the inertial wind load method (GBJ), the base matrix wind load factor method (MGLF) and the wind vibration response analysis method based on random vibration theory are introduced. The wind tunnel test data are analyzed by random vibration theory, and the equivalent static wind load and peak acceleration at the top of each pipe model are obtained, and the results of wind tunnel test are compared with those calculated by Chinese and Japanese code.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU973.213

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 沈蒲生;張超;葉縉W，

本文編號：2179067