Assessment Of Buildings Response
To Earthquakes
Author(s)
A. Farah
Abstract
Modern buildings are designed to withstand earthquake loads and to reduce the
probability of a disastrous collapse or life-threatening damage due to strong
earthquakes. Under medium-intensity earthquakes, the damage to buildings
should be repairable, and no building damage or discomfort to the occupants
should occur due to minor earthquakes. Buildings are designed to have some
structural damage but not collapse due to major earthquakes. The parameters that
influence the building behaviour include the characteristics of the earthquake, the
soil and the structure itself, such as mass, stiffness and damping. Some
earthquake characteristics coupled with suitable site conditions can produce
resonance in buildings as was the case that led to the severe damage due to the
Mexico earthquake of 1985. In this paper, the response of a building to seismic
excitations is evaluated using soil-structure interaction parameters, and its
severity is assessed based on the comfort level of the human occupant as judged
by the absorbed power (rate of energy dissipation) through a biomechanical
model placed on a given floor of the building. The building is represented as a
multi-degree-of-freedom system with soil-structure interaction, and the
earthquake action is represented by its power spectra. The results indicate that
absorbed power differentiates between comfort levels, and therefore human
response, at the different floor levels. Results also show that the soil
characteristics, the earthquake power spectrum as well as the damping in the
structure have significant effect on the response of the building.
Keywords: earthquakes, absorbed power, human comfort curves, building
serviceability, power spectra, soil-structure interaction.
Keywords
earthquakes, absorbed power, human comfort curves, building
serviceability, power spectra, soil-structure interaction.
Related Book
Other papers in this volume
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