Abstract
This paper simultaneously measures the characteristics of wind on the roof and the acceleration responses of the 10th, 18th, 25th, 32nd and 41st floors of a high-rise building in Wenzhou during the passing of typhoons between 2014 and 2016. This paper also analyses the dynamic characteristics and wind-induced response of buildings by using Welch and improved Natural Excitation Technique–Eigensystem Realisation Algorithm methods. The results show that the typhoons that affected Wenzhou are dominated by wind from the east, northeast and northwest. The acceleration response probability densities of different floors during Typhoons Chan-hom and Dujuan are similar to the Gaussian distribution. The first-order natural frequencies of the two wind directions of the test building are 0.390 and 0.409, which are in good agreement with Tamura’s prediction results. The relevant amplitude and frequency characteristics of the first three modes are investigated in detail according to the nonlinear characteristics of the measured building. The first-, second- and third-order damping ratios of the structure during Typhoons Chan-hom and Dujuan increased with the peak acceleration, whereas the damping during Typhoon Fung-wong remained almost unchanged. The root mean square of the acceleration response of the building structure during Typhoons Chan-hom and Dujuan increased with the wind speed. However, the increase rate of Typhoon Chan-hom was small, possibly because the angle between the incoming flow and the building is 45°, and the acceleration response in the downwind and crosswind directions is not apparent. The measured results show that the working environment of the staff at the top of the building under the influence of the typhoon also meets comfort requirements. The measured data and statistical parameters provide a valuable reference for the wind-resistant design of high-rise buildings in typhoon-prone areas.
Highlights
The number of high-rise buildings in coastal areas are increasing, and these buildings have become higher and softer with the application of new materials, the innovation of design concepts and the advancement of construction technology
Huang et al [18], based on the measured acceleration data of a super high-rise building under the action of a typhoon, considered an amplitude greater than 10 mm/s2 ; the X-direction vibration mode damping ratio gradually becomes larger as the amplitude increases, and the amplitude reaches 30 mm/s2
The basic idea of the Natural Excitation Technique () method is that the cross-correlation and impulse response functions between two points of the structure under white noise excitation have
Summary
The number of high-rise buildings in coastal areas are increasing, and these buildings have become higher and softer with the application of new materials, the innovation of design concepts and the advancement of construction technology. Aeroelastic models, which simulate the amplitude-dependent damping characteristics of high-rise buildings and are designed in wind tunnel tests, are not considered. Li et al [13] conducted field measurements on the 324 m Diwang Tower and a 367 m high-rise building to analyse the influence of nonlinear damping characteristics on dynamic behaviour and found that the damping ratio increased with the increase in amplitude. Huang et al [18], based on the measured acceleration data of a super high-rise building under the action of a typhoon, considered an amplitude greater than 10 mm/s2 ; the X-direction vibration mode damping ratio gradually becomes larger as the amplitude increases, and the amplitude reaches 30 mm/s2. Sci. 2019, 9, 2180 for studies on the nonlinear characteristics of the modal parameters of high-rise buildings during typhoons
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