Evaluation of seismic torsional responses of building structures in Hong Kong

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Evaluation of seismic torsional responses of building structures in Hong Kong


Author: Chan, Wing-ki Ricky
Title: Evaluation of seismic torsional responses of building structures in Hong Kong
Degree: M.Sc.
Year: 2001
Subject: Structural dynamics
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: viii, 77, [79] leaves : ill., maps ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1569118
URI: http://theses.lib.polyu.edu.hk/handle/200/4050
Abstract: Seismic torsional responses of building structures were reported responsible for some severe damages in buildings during earthquakes in history. This paper reviewed structural dynamics of torsionally unbalanced (TU) systems, seismicity and local soil conditions of Hong Kong region, as well as recent works on seismic torsional behavior of structures, both elastic and inelastic approaches. To investigate the possible seismic torsional effects in Hong Kong, 6 sample buildings were chosen and linear time-history analysis was carried out with a commercially available software. Four of these samples were low-rise buildings (less than 10 stories) and the other two were high rise buildings. The samples chosen were considered typical and representative locally. Input ground motion was the North-South component of 1940 Imperial Valley El Centro Time History. The time history was scaled to 0.068g, 0.125g and 0.25g, representing mild, moderate and major earthquakes. The structures were then analyzed again with their center of mass artificially moved to the location of center of stiffness, archiving a torsionally balanced (TB) structure. Displacements of TU and TB system, at extreme ends of storey diaphragms were compared. Results show that torsional effects are common in the samples. Due to the lack of awareness of earthquake risk in the engineering practice in Hong Kong; structural asymmetry is common, and proper attention to its consequences has not been received. Possible significant seismic torsional effects are expected to occur in case of an earthquake attack in the vicinity of Hong Kong region.

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