Dynamic analysis of wind-excited tall buildings in Hong Kong

Pao Yue-kong Library Electronic Theses Database

Dynamic analysis of wind-excited tall buildings in Hong Kong

 

Author: Sze, Pui-kwan Kenny
Title: Dynamic analysis of wind-excited tall buildings in Hong Kong
Degree: M.Sc.
Year: 1997
Subject: Tall buildings -- China -- Hong Kong
Wind resistant design
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: 125, 20 p. : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1250472
URI: http://theses.lib.polyu.edu.hk/handle/200/301
Abstract: Since there is not any assistance in Hong Kong wind code (1983) so far on how to consider wind induced dynamic effects of tall buildings in term of strength design and how to evaluate their serviceability performance in term of human comfort, this thesis presents the results on how the Hong Kong wind climate could be considered to examine dynamic effects of tall buildings in both strength and serviceability performance, using analytic methods presented in other national wind loading codes. In analysis of Hong Kong wind climate and design wind speeds together with their the original derivation adopted in Hong Kong wind code (1983), it reveals that determination to use 64m/s as hourly gradient mean wind speed implied in the current code must be questioned, since there is no sufficient background to predetermine this gradient mean wind speed for Hong Kong case. Furthermore, if the original approach to derive design wind velocity profile for the code is used, both gust and mean wind speed at reference height can not satisfied each other based on historical wind record. As a consequence, new mean wind velocity profiles must be proposed if dynamic analysis methods would be accepted in future codification of Hong Kong wind code, which have been discussed in this thesis to some extent. From the dynamic analysis of tall buildings, it is found that the static method adopted in the present Hong Kong wind code is not always in conservative side when it is applied to a tall building with a small natural frequency and low damping ratio. The wind induced dynamic response in term of along wind or cross wind responses can really dominate the design. As a result, it becomes necessary to include some dynamic analysis method in future codification of wind code. Furthermore, this thesis also reveals that not only deflection criteria must be satisfied, but also human comfort criteria should be imposed to those modern tall buildings in Hong Kong such that people who lives or works at top level of tall buildings would not suffer physical and psychological discomforts during a strong wind attacks the buildings.

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