Seismic Analysis: Past, Present And The Future
Author(s)
D. Mestrovic, D. Cizmar & P. Roncevic
Abstract
This paper summarizes earthquake calculations according to Eurocode
regulations and codes applied in Croatia (Europe). The paper shows past, present
and future methods for determination of seismic forces – an overview of all
methods used is given. A simple pseudo static calculation is analyzed and
compared to seismic forces according to Eurocode. An overview of spectral
analysis according to Eurocode and Croatian code is given and discussed.
Finally, time history analysis is discussed because as computer power increases
with the availability of the strong motion database, the real records are becoming
more popular for defining the input to dynamic analyses. The paper discuses
three basic methods of input data – artificial records, synthetics accelograms and
real records recorded during earthquakes. The possibility of using real records
(for both linear and non-linear time history) is analyzed and discussed. A
conclusion about the use of real accelograms (time history) versus spectral
analysis is given.
Keywords: seismic analysis, time history, accelogram.
1 Introduction
An earthquake is a phenomenon that results from the sudden release of stored
energy in the Earth's crust that creates seismic waves. At the Earth's surface,
earthquakes manifest themselves by a shaking or displacement of the ground.
Earthquakes are related to the tectonic nature of the Earth. The Earth's
lithosphere is a composed of plates in very slow but constant motion caused by
the heat in the Earth's mantle and core. Plate boundaries can grind past each
other, creating frictional stress. When the frictional stress exceeds a critical
value, a sudden failure occurs. The boundary of tectonic plates along which
failure occurs is called the fault plane. When the failure at the fault plane results
in a displacement of the Earth's crust, the elastic strain energy is released and
Keywords
seismic analysis, time history, accelogram.
Related Book
Other papers in this volume
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