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- Title
Identification of modal parameters of a 600‐m‐high skyscraper from field vibration tests.
- Authors
Zhang, Junwei; Li, Qiusheng
- Abstract
Summary: Accurate prediction of the dynamic responses of a high‐rise building subjected to dynamic loads such as earthquake and wind excitations requires the information of its structural dynamic properties such as modal parameters including natural frequencies and damping ratios. This paper presents the identification results of the modal parameters based on field vibration tests on a 600‐m high skyscraper. A set of tests, including ambient vibration test (AVT) and free vibration test (FVT), were conducted on the skyscraper to identify its modal parameters. Firstly, this paper presents and discusses the modal parameters of the skyscraper assessed by several identification methods applied to the AVT measurements. These methods include the wavelet transform (WT) method, the stochastic subspace identification (SSI) method, and the random decrement technique (RDT). Secondly, an active mass damper (AMD) system with total mass 1000 tons equipped into the skyscraper was used to excite the building for estimation of the modal parameters by FVT. Thirdly, this paper presents observations on the structural dynamic behavior of the skyscraper with the operation of the AMD system during a typhoon event. The field measurement results show that the AMD system functioned efficiently for suppression of the wind‐induced vibrations of the skyscraper during the typhoon. This paper aims to further understand the structural dynamic properties of super‐tall buildings and provide useful information for structural design and vibration control of future skyscrapers.
- Subjects
VIBRATION tests; SKYSCRAPERS; TALL building design &; construction; EFFECT of earthquakes on buildings; TYPHOONS; PARAMETER identification; FREE vibration; STRUCTURAL dynamics; DYNAMIC loads
- Publication
Earthquake Engineering & Structural Dynamics, 2019, Vol 48, Issue 15, p1678
- ISSN
0098-8847
- Publication type
Article
- DOI
10.1002/eqe.3219