摘要
为了探究超高层核心筒对称结构风振响应特性,以标高596.5 m的天津高银117大厦为试验对象,在大厦核心筒顶层4个角处分别布设监测点,通过GNSS-RTK多星系实时坐标方位监测技术及基于自相关函数的EMD滤波去噪法,对风荷载作用下其相应测点处X及Y向的振动曲线规律、位移频谱特性等进行了现场实测分析,通过最小二乘法对各测点X及Y向振幅进行统计标点,得出各测点风致振动轨迹,并以原始信号与去噪处理后信号之间的标准差NSTD与相关系数r为评价指标,对比分析了EMD信号去噪法与EMD滤波去噪法的作用特性。结果表明:GNSS-RTK多星系坐标监测技术针对超高层建筑风振特性实测研究数据监测精度较高,误差较小,具有较强的实用价值;风荷载作用下,超高层核心筒对称结构不仅存在顺风向振动响应,还存在横风向振动响应;各测点X及Y向主频相差较小,风致振动轨迹为近椭圆形,且偏转角度有较大差异,即超高层核心筒对称结构在周围风载作用下存在扭转变形作用力;EMD滤波去噪法可以很好地处理风振特性等相关非线性信号,通过对监测数据局部去噪及重组处理得出利于分析的风振曲线,且标准差NSTD较小,相关系数r较大,较EMD信号去噪法具有更好的去噪效果。
The given paper intends to explore the wind-induced vibration response features of the symmetrical structure of the super-high-rise core tube or critical tube by taking the 117 storied Gaoyin skyscraper in Tianjin as the monitoring point of its 4 corners of its top floor. As is known,the core or critical tube of the skyscraper is 596. 5 m high. What we would like to measure and analyze is to test the vibration curve and the displacing spectrum features in X and Y directions at the corresponding measuring points under the wind load by means of GNSS-RTK multi-galaxy real-time coordinate azimuth monitoring technology and the EMD filtering denoising method based on the autocorrelation function.In our paper,we have managed to test the amplitude of each measuring point of the X and Y directions so as to work out the least square method to gain the wind-induced vibration track of the each measuring point. The standard deviation NSTDand the correlated coefficient r between the original signal and the denoised signal can be taken as the evaluation indexes to compare and analyze the functional features of the EMD signal denoising method and the EMD filtering denoising method so as to gain the following results. And,then,the GNSS-RTK multi-galaxy coordinated monitoring technology can be taken to find the high monitoring accuracy and the relatively small error for the measured data of the wind vibration features of the super high-rise with the strong practical value. And,then,under the strong impact of the wind load impact,there can be found not only the existence of the wind-down vibration response,but also the transverse wind vibration response in the symmetrical structure of the super-tall critical or core tube. And,so,it can be found that,though the main frequency difference in X and Y directions of each measuring point is minor,the wind-induced vibration track can be said to reach nearly elliptic state with their deflecting angles being greatly various,that is to say,the symmetrical structure of the super-high core tube might have a torsion deformation under the strong wind load impact. And,in such a case,the EMD filtering denoising method can be used to deal with the relevant nonlinear signals,such as the wind-induced vibration impact,etc. And,then,through the local denoising and recombination processing of the monitoring data,it would be possible for the wind-induced vibration curves to be turned to analyze the conducive data that can be gained. Moreover,though the standard deviation NSTDis minor,the correlation coefficient r can be quite great. And,so,comparatively speaking,the EMD filtering denoising method can be endowed with a better denoising effect than the EMD signal denoising one.
作者
郁雯
何浩博
熊春宝
YU Wen;HE Hao-bo;XIONG Chun-bao(Hebei Province Key Laboratory of Civil Engineering Diagnosis,Reconstruction and Disaster Reduction,Zhangjiakou 075000,Hebei,China;College of Civil Engineering,Hebei College of Civil Engineering and Construction,Zhangjiakou 075000,Hebei,China;China Railway Design Group Co.,Ltd.,Tianjin 300142,China;College of Civil Engineering and Architecture,Tianjin University,Tianjin 300072,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2021年第4期1447-1454,共8页
Journal of Safety and Environment
基金
2021年河北省高等学校科学技术研究青年基金项目(QN2021218)。
关键词
安全工程
超高层
对称结构
风振特性
safety engineering
super high-rise
symmetrical structure
wind vibration characteristics
