DBPapers
DOI: 10.5593/sgem2012/s06.v2005

GROUND OSCILLATIONS DURING STRONG EARTHQUAKES

D. ZLATKOV, S. ZDRAVKOVIC, M. STANOJEV
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 569 - 576 pp

ABSTRACT

One of the most used instrumental measurements for earthquake intensity is maximum
ground acceleration at. Earthquake load does not act directly on the structure in the form
of force, as other loads, but indirectly, via ground motion. Mass acceleration in case of
infinitely rigid structures is equal to ground acceleration, so for such structures, the
maximum inertial force on the structure is equal to the product of mass and maximum
ground acceleration. For this reason, in case of rigid structures, it has a consistent
correlation with the damage on the structures. In the paper, except for the maximum
ground acceleration, also analyzed are the maximum ground displacement, the
maximum ground velocity, duration of the intensive part of oscillations and frequency
composition of oscillations (predominant periods). Considerations of certain
characteristic ground oscillations are best accomplished by comparison of
accelerograms of the earthquakes which occurred. Maximum velocity decreases with
the decrease of magnitude and distance from hypocenter. Maximum ground
displacements are important primarily for flexible structures. For corresponding impacts
are given characteristic formulas and characteristic tables and diagrams, better
explaining the subject matter.

Keywords: earthquake, maximum acceleration, velocity, displacement, earthquake
duration, predominant periods.