Structural Responses of a Supertall Building Subjected to a Severe Typhoon at Landfall

Zhi Li,Yuncheng He,Jiurong Wu,Zhen Liu,Rui Rao,Jiyang Fu,Ching-Tai Ng

doi:10.3390/app10082965

Zhi Li, Yuncheng He + Show 5 more

Open Access

https://doi.org/10.3390/app10082965

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Journal: Applied sciences	Publication Date: Apr 24, 2020
Citations: 11	License type: CC BY 4.0

Affiliation: Guangzhou University, University of Adelaide

Abstract

Typhoon Mangkhut (1822) was one of the strongest tropical cyclones that ever impacted the south coast of China in past decades. During the passage of this typhoon, the structural health monitoring (SHM) system installed on a 303 m high building in this region worked effectively, and high-quality field measurements at nine height levels of the building were collected successfully, which provides a valuable opportunity to explore the dynamic properties of the building and the associated wind effects. In this study, the typhoon wind characteristics are presented first based on in-situ measurements at two sites. Acceleration responses of the building is then investigated, and the building’s serviceability is assessed against several comfort criteria. This study further focuses on the identification of modal parameters (i.e., natural frequency, damping ratio, and modal shape) via two methods: stochastic subspace identification (SSI) method and a method based on combined use of spectral analysis and random decrement technique (RDT). The good agreement between the two results demonstrates the effectiveness and the accuracy of the adopted methods. The obtained results are further compared with the stipulations in several technical codes as well as simulation results via finite element method to examine their performances in this real case. The amplitude dependence of natural frequencies and damping ratios of the studied building are also stressed.

Highlights

There is a fast development of high-rise buildings at coastal areas where tropical cyclones (TCs) may attack frequently [1]
This study focuses on the structural responses of this skyscraper with a primary objective of further understanding the dynamic properties of and the typhoon effects on this building based on multi-levels of field measurements
(2) As the building was constructed, its stiffness may be increased slightly due to the contribution of non-structural components such as doors, windows, and walls, which were not taken into account during the numerical simulation

Summary

Introduction

There is a fast development of high-rise buildings at coastal areas where tropical cyclones (TCs) may attack frequently [1] As these buildings are commonly characterized by low natural frequencies and high flexibilities, they become considerably sensitive to wind load [2]. Numerous filed studies on dynamic performance of high-rise buildings under wind action have been conducted [8,9,10,11,12,13,14] Among these works, Kijewski-Correa, et al established structural health monitoring (SHM) systems on four skyscrapers in Chicago and Dubai and analyzed the structure dynamic properties and the associated wind effect based on collected records [15,16,17]

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