Response of tall buildings to weak long distance earthquakes
Earthquake Engineering & Structural Dynamics
Copyright © 2001 John Wiley & Sons, Ltd.
In the last decade, two tall buildings in Singapore were instrumented with accelerometers and anemometers for the original purpose of identifying the characteristics and effects of wind loading. During the monitoring it became clear that the largest acceleration responses should result from ground motions due to earthquakes having magnitudes between 6 and 8 and epicentres at least 350 km distant. The paper describes the strategy for identifying and capturing the signals from distant tremors, which depends on tracking the RMS response levels in the second vibration mode. Characteristics of some recorded signals are given. While response levels are generally small, the frequency content coincides with the range of fundamental mode frequencies for high rise residential buildings. The validity of using a tall building as a ‘weak-motion’ seismograph is discussed by considering the mode shape of the building and the measured transfer function between basement and roof responses.
This is the peer reviewed version of the article, which has been published in final form at DOI 10.1002/eqe.32. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Earthquake Engineering & Structural Dynamics, 2001, Vol. 30, Issue 5, pp. 709 - 729