第 35 第 第 1 第 第 第 第 第 第 第 第 第 第 Vol. 35 No.1 2018 第 1 第 Journal of Architecture and Civil Engineering Jan. 2018 环环环环环环环环环环环环环环环环环环环环 第第第 1,2 第 , 1 第 , 2 第 , 2 第 第 , 1 (1.第第第第第第第 第第 第第 , 410082;2.第第第第第第第第第第第 第第 , ) 环 :第第第 600 m 第第第第第第——第第第第第第第第第第第第第第第第第第第第第第第第第第第第第 第第第第第第第 。 118 第第 2 第第第 第第第第第第第第第第 传 ,( EMD 第 ) (RDT 第第第第第第 )。,,。: EMD 第 RDT 第第第第第第第第第第第第 1 第第第第第第第第第 0.12 Hz 第 , 0.3%~0.6% 第 ; 1 第第第第第 第第第第 0.28 Hz 第 , 0.8%~1.0% 第第第 ;,, EMD 第 RDT 第 第 ;。 环 :第第第第第第 ;;;;; 环 :TU973.2 环 :A Modal Parameter Identification of Ping’an Financial Center in Shenzhen Under Ambient Wind Excitation LI Qiu-sheng 1,2 , HAN Xu-liang 1 , HE Yun-cheng 2 , HE Ying-hou 2 , ZHOU Kang 1 (1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China) Abstract: The 600 m height super high-rise building of Ping’an Financial Center (PAFC) in Shenzhen was field measured under external ambient wind excitation. The wind-induced acceleration responses of the structure were measured by the two groups of acceleration sensors installed on the 118th floor. The natural frequency and damping ratio of the structure were calculated by combining empirical mode decomposition (EMD) and random decrement technique (RDT). The three-dimensional finite element model of Ping’an Financial Center in Shenzhen was established, and the natural frequency of the structure was obtained by finite element analysis. The results show that using EMD and RDT combination method, the first-order transverse natural vibration frequency is about 0.12 Hz, the damping ratio is 0.3%-0.6%; the first-order torsional natural vibration frequency is about 环 :第第第第第第第第第第第第第第第第 ( 91215302 第第 );(51178179) 环 :第第第 ( 1962- 第第第第第 ),,,,,,E-mail:[email protected]。
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Modal Parameter Identification of Ping’an Financial Center in Shenzhen
Under Ambient Wind Excitation
LI Qiu-sheng1,2, HAN Xu-liang1, HE Yun-cheng2, HE Ying-hou2, ZHOU Kang1
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China)
Abstract: The 600 m height super high-rise building of Ping’an Financial Center (PAFC) in Shenzhen was field
measured under external ambient wind excitation. The wind-induced acceleration responses of the structure were
measured by the two groups of acceleration sensors installed on the 118th floor. The natural frequency and damping
ratio of the structure were calculated by combining empirical mode decomposition (EMD) and random decrement
technique (RDT). The three-dimensional finite element model of Ping’an Financial Center in Shenzhen was
established, and the natural frequency of the structure was obtained by finite element analysis. The results show that
using EMD and RDT combination method, the first-order transverse natural vibration frequency is about 0.12 Hz,
the damping ratio is 0.3%-0.6%; the first-order torsional natural vibration frequency is about 0.28 Hz, the damping
ratio is 0.8%-1.0%. The measuring natural vibration frequency and damping ratio of Ping’an Financial Center in
Shenzhen are close to other similar high-rise structures, and the measured results are in good agreement with the
finite element analysis results, which verifies the effectiveness of EMD and RDT combination method to analyze
度传感器,数据采集设备采用美国国家仪器公司(National Instruments,NI)的 NI cDAQ-9174 机箱加 NI 9234 采集卡,采集软件为 LabVIEW2015。
图 2 塔楼 118 层传感器布置Fig.2 Sensor Layout of 118th Floor
图 3 数据采集硬件Fig.3 Hardware for Data Acquisition
2.2 虚拟仪器技术美国国家仪器公司于 1986 年最早提出来的虚
拟仪器(Virtual Instrument,VI)的概念,其基本原理是将计算机作为硬件平台,将原本需要使用硬件实现的功能通过软件来实现,利用高性能的模块化硬件,结合高效灵活的软件来完成各种测试、测量和自动化的应用,以便最大限度地降低系统成本,增强系统的功能及灵活性。本研究采用美国 National Instruments虚拟仪器
一组结构风致响应加速度数据时程的曲线往往是杂乱无章的,这是因为其中包含了多个模态的信号以及一些噪声信号,EMD 方法可以将杂乱的数据信号分解为多个 IMF,选取其中包含结构振动响应的 IMF 进行下一步分析,以此来去除原始信号中的噪声信号和无用信号。其中 IMF 应具备以下特性:①信号的极值点(极大值或极小值)数目和过零点数目相等或相差最多一个;②由于局部极大值构成的上包络线和由于局部极小值构成的下包络线的平均值为零。