Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements
Estimation of Modal Properties of Low-Rise Buildings Using Ambient Excitation Measurements
复制标题
使用环境激励测量估计低层建筑的模态特性
DOI：
10.1155/2015/173450
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发表时间：
2015
影响因子：
1.6
通讯作者：
E. Foerster
中科院分区：
文献类型：
--
作者：
K. Wijesundara;C. Negulescu;E. Foerster
连续小波变换（CWT）是近年来出现的一种很有前途的工具，用于通过环境激励测量识别结构的模态特性。然而，这是很难得到一个准确的估计阻尼比直接从环境振动测量的时频分解使用连续小波变换。本研究的主要目的是介绍一种新的方法，称为两步法估计阻尼比环境振动测量。两步过程涉及的随机减量（RD）签名的环境振动测量，这是等效于阻尼自由振动响应的结构下，一个给定的初始位移和随后的时域RD签名分解到时间-频率域使用连续小波变换的发展。研究的第二个目的是表明，CWT是能够识别的固有周期和模态振型的低层建筑物使用环境振动测量。最后，以一个五层砌体填充墙钢筋混凝土结构和一个三层砌体结构为例，验证了两步法的有效性。最后，可以得出结论，两步过程产生一个相当好的估计阻尼比。
Continuous wavelet transform (CWT) has recently emerged as a promising tool for identification of modal properties through ambient excitation measurements of structures. However, it is difficult to obtain an accurate estimation of damping ratio directly from time-frequency decomposition of ambient vibration measurements using CWT. The main objective of this study is to introduce a new method called two-step procedure in the estimation of damping ratios using ambient vibration measurements. The two-step procedure involves the development of random decrement (RD) signature from the ambient vibration measurements, which is equivalent to the damped free vibration response of a structure under a given initial displacement and subsequently decomposition of time domain RD signature into time-frequency domain using CWT. The secondary objective of the study is to show that CWT is capable of identifying the natural periods and mode shapes of low-rise buildings using ambient vibration measurements. Furthermore, the two-step procedure is validated with two practical applications in a five-storey reinforced concrete structure with masonry infill walls and a three-storey masonry structure. Finally, a conclusion can be drawn that the two-step procedure yields a reasonably good estimation of damping ratio.
DOI：
10.1098/rspa.1998.0193
发表时间：
1998-03-08
影响因子：
3.5
作者：
Huang, NE;Shen, Z;Liu, HH
通讯作者：
Liu, HH