A Study On Hysteretic Plastic Energy Input Into
Single And Multi Degree Of Freedom Systems
Subjected To Earthquakes
Author(s)
K. Sawada, A. Matsuo & K. Ujiie
Abstract
This paper relates the hysteretic plastic energy inputs of single degree of freedom
(SDOF) and multi degree of freedom (MDOF) systems. First, the simple
empirical rule between the hysteretic plastic energy input ratio EH/EI and the
ratio of the yield strength to the response acceleration spectrum are shown by a
large data set of numerical results. Based on this rule, a prediction method of
seismic input energy EI and hysteretic plastic energy EH using a design
acceleration spectrum is presented. Finally, the time domain analyses of SDOF
and MDOF systems under generated earthquake motions fitted to the design
spectrum show the validity of the presented method.
Keywords: earthquake motion, hysteretic plastic energy, SDOF system, MDOF
system.
1 Introduction
Many modern seismic design building codes allow for the plastic deformation in
structural members and avoid the catastrophic collapse in severe earthquakes.
Seismic design approaches based on the constraint of the maximum plastic
deformation of structure have been presented in many previous studies [1, 2]. On
the other hand, energy based design concepts have also been proposed.
Housner [3] evaluated the total energy input that contributes to a building's
responses in elastic and elastic-plastic systems. Akiyama [4] developed
Housner's method to devise an earthquake-resistant design method that could be
applied in a uniform manner from one-story frames to high-rise buildings. In the
Keywords
earthquake motion, hysteretic plastic energy, SDOF system, MDOF
system.
Related Book
Other papers in this volume
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