测压管路系统对高层建筑风荷载特性的影响
发布时间：2018-08-12 12:32
【摘要】：随着科技水平的不断进步以及城市的快速发展,现代高层建筑朝着更高、更轻、更柔的趋势发展,结构的自振频率接近于自然风的卓越频率。高层建筑自振周期变长、结构阻尼变小致使高层建筑结构对风荷载敏感,风荷载逐渐成为控制高层建筑安全性、舒适性和经济性的重要影响因素。测压管路系统对脉动压力信号有阻尼作用,脉动风压经过管路系统会发生信号畸变,目前分析测压管路系统对高层建筑风荷载影响的研究较少。因此本文对测压系统测得的不同测压管长的高层建筑对风荷载特性进行了深入的分析和探讨,主要的研究成果如下:详细介绍测压管路系统的理论,基于流体管道的耗散模型分析风洞试验中测压管路系统的频响函数,通过测定试验获得不同测压管长的真实频响函数并验证理论模型的精确性,并对频响函数的幅频特性曲线和相位特性曲线随频率变化进行研究,进一步利用频响函数在时域和频域两方面对脉动风压的畸变信号进行修正。对不同测压管长的高层建筑开展了刚性模型的同步测压试验,详细研究了各管路模型表面的风压分布特性、脉动风压特性和峰值风压以及测压管路对风压特性的影响。管路的长短对平均风压影响较小,对脉动风压影响较大,管路越长,脉动风压衰减得越快。从时域和频域两种角度探讨各管路模型的脉动风压相关性和相干性,并对脉动风压功率谱进行研究。采用目标概率法求出峰值因子并对各管路模型的峰值风压进行研究。研究三分力系数幅值和频域特性、相干函数以及测压管路对风荷载特性的影响。以测压管长为基本变量,利用最小二乘法建立了三分力系数幅值的拟合公式。对测压管长进行二次拟合,分别建立了适合于不同测压管长的矩形高层建筑顺风向、横风向和扭转向风荷载的数学模型,同时建立了顺风向、横风向及扭转向的相干函数的数学模型,拟合结果与试验结果吻合较好。研究测压管路对高层建筑等效风荷载及风致加速度的影响。介绍阵风荷载因子法(GLF法)、惯性风荷载法(GBJ)、基底阵风荷载因子法(MGLF)以及基于随机振动理论的风振响应分析方法。通过随机振动理论对风洞试验数据进行分析,得到各管路模型的等效静力风荷载和顶部峰值加速度,并将风洞试验结果与中日规范计算结果进行比较。
[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.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.213
[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.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.213
【参考文献】
相关期刊论文 前10条
1 沈蒲生;张超;叶缙W，
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