某超高层建筑刚性模型测力试验研究
|
摘要
在4m×3m边界层风洞中对某高295m的超高层建筑分别进行了有、无周边建筑的刚性模型测力天平试验,得到建筑3个主轴方向基底力矩均值和均方根值随风向角的变化情况,通过比较表明周边超高层建筑对其具有较严重的干扰影响;分析了功率谱和相干函数所表现出的力矩频域特性,横-扭方向基底弯矩相关性明显较顺-横、顺-扭两向大;通过敲击试验得到基底弯矩的自由衰减信号,采用HHT变换方法,识别了模型-天平系统在两个主轴方向的一阶频率和阻尼比,并根据频率和阻尼比消除了基底弯矩信号中由于模型非绝对刚性引起的共振响应分量,由此修正得到较为精确的基底力谱和各角度均方根值,为计算风振响应提供了依据。
Rigid model testing of a super high-rise building,with and without surrounding buildings,are performed respectively in a 4m×3m boundary layer wind tunnel based on the force balance.The changes of mean and rms moments in three body axes with the wind direction angle are obtained,which shows that surrounding super high-rise buildings act notable interference on it.The frequency domain property of power spectral density and coherence are analyzed.The results show that coherence of bottom moment between across-wind and torsion direction is obviously bigger than that between along-wind and across-wind direction,along-wind and torsion direction.According to the free attenuation of bottom moment by means of a knock testing,the frequency and damping ratio of the model-balance system,are recognized by HHT method,which are further utilized to eliminate the resonant response raised by lack of stiffness.In this way,modified power spectral density of the base moment and the root mean square can be obtained and be used to calculate the wind induced response.
Rigid model testing of a super high-rise building,with and without surrounding buildings,are performed respectively in a 4m×3m boundary layer wind tunnel based on the force balance.The changes of mean and rms moments in three body axes with the wind direction angle are obtained,which shows that surrounding super high-rise buildings act notable interference on it.The frequency domain property of power spectral density and coherence are analyzed.The results show that coherence of bottom moment between across-wind and torsion direction is obviously bigger than that between along-wind and across-wind direction,along-wind and torsion direction.According to the free attenuation of bottom moment by means of a knock testing,the frequency and damping ratio of the model-balance system,are recognized by HHT method,which are further utilized to eliminate the resonant response raised by lack of stiffness.In this way,modified power spectral density of the base moment and the root mean square can be obtained and be used to calculate the wind induced response.
引文
[1]COOK N J.A sensitive 6-component high-frequency-rangebalance for building aerodynamics[J].Phys.E.Sci.In-strum,1983,116:390-393.
[2]顾明,周印,张锋,等.用测力天平方法研究金茂大厦的动力风荷载和风振响应[J].建筑结构学报,2000,21(4):55-61.
[3]石碧青,谢壮宁,倪振华.用高频底座力天平研究广州西塔的风效应[J].土木工程学报,2008,41(2):42-48.
[4]黄鹏,顾明,张锋,等.上海金茂大厦静风荷载研究[J].建筑结构学报,1999,20(6):63-68.
[5]张亮亮,吴云芳,余洋,等.高层建筑风荷载高频测力天平试验技术[J].重庆大学学报(自然科学版),2006,29(2):99-102.
[6]杨伟,黄鹏,顾明.高层建筑风致静力干扰效应的试验和数值研究[J].同济大学学报,2004,32(2):152-156.
[7]黄鹏,顾明.高层建筑风致动力干扰效应机理的试验研究[J].振动工程学报,2003,16(1):99-104.
[8]黄鹏,顾明.高层建筑风致扭转荷载的干扰效应研究[J].建筑结构学报,2005,26(4):86-91.
[9]HUANG NE,SHEN Z,LONGSR,et al.The empiricalmode decomposition and the Hilbert spectrum for non-linear and non-stationary time series analysis[C]//Pro-ceedings of the Royal Society of London,1998,454:903-995.
[10]张郁山.希尔伯特-黄变换(HHT)与地震动时程的希尔伯特谱——方法与应用研究[D].哈尔滨:中国地震局地球物理研究所,2003.
[11]程丰,胡国风.高频底座天平的研制与应用[J].气动实验与测量控制,1995,9(1):58-61.
[12]邹良浩,梁枢果.半刚性模型风洞试验荷载谱的处理方法[J].实验流体力学,2007,21(3):76-81.
[2]顾明,周印,张锋,等.用测力天平方法研究金茂大厦的动力风荷载和风振响应[J].建筑结构学报,2000,21(4):55-61.
[3]石碧青,谢壮宁,倪振华.用高频底座力天平研究广州西塔的风效应[J].土木工程学报,2008,41(2):42-48.
[4]黄鹏,顾明,张锋,等.上海金茂大厦静风荷载研究[J].建筑结构学报,1999,20(6):63-68.
[5]张亮亮,吴云芳,余洋,等.高层建筑风荷载高频测力天平试验技术[J].重庆大学学报(自然科学版),2006,29(2):99-102.
[6]杨伟,黄鹏,顾明.高层建筑风致静力干扰效应的试验和数值研究[J].同济大学学报,2004,32(2):152-156.
[7]黄鹏,顾明.高层建筑风致动力干扰效应机理的试验研究[J].振动工程学报,2003,16(1):99-104.
[8]黄鹏,顾明.高层建筑风致扭转荷载的干扰效应研究[J].建筑结构学报,2005,26(4):86-91.
[9]HUANG NE,SHEN Z,LONGSR,et al.The empiricalmode decomposition and the Hilbert spectrum for non-linear and non-stationary time series analysis[C]//Pro-ceedings of the Royal Society of London,1998,454:903-995.
[10]张郁山.希尔伯特-黄变换(HHT)与地震动时程的希尔伯特谱——方法与应用研究[D].哈尔滨:中国地震局地球物理研究所,2003.
[11]程丰,胡国风.高频底座天平的研制与应用[J].气动实验与测量控制,1995,9(1):58-61.
[12]邹良浩,梁枢果.半刚性模型风洞试验荷载谱的处理方法[J].实验流体力学,2007,21(3):76-81.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心