کلیدواژه‌ها
طیف انرژی، نسبت میرایی، شکل‌پذیری تغییرمکانی، انرژی
ورودی نسبی، انرژی ورودی بر واحد جرم
نویسندگان
1
استادیار، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران
2
دانشیار، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران
3
دانشجوی دکتری مهندسی زلزله، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان،
ایران
Structural Damping and Displacement Ductility Effects on Input Energy Spectrum of Earthquake
Abstract
To improve seismic design of structures, providing more comprehensive
criterion than the common criteria in structural seismic design is
essential for the engineering community. The concept of energy has been
considering as a seismic design philosophy in research communities; But
there are some gaps for application of energy concept and its
development in seismic design, and filling a small part of these gaps is
the main objective of this study. Energy criterion is simple, scalar
and conceptual quantity. Easy using of spectrum as an efficient tool in
engineering is noteworthy; therefore, study on effects of damping and
ductility on input energy spectrum is effective step to exert the energy
criterion in structural seismic design. In this research, by using
nonlinear dynamic analysis for 4 damping ratios and 4 ductility factors,
relative input energy spectra per unit mass of structure have been
produced for 4 Iranian earthquakes. Then 64 spectra that produced in
this study have been reviewed and obtained-results have been discussed.
Scrutiny of spectra show that increasing of damping ratio and ductility
have reduced spectrum’s changes. Also, variation of ductility factor is
more effective than the variation of damping ratio on relative input
energy spectrum. Variation of damping ratio and ductility factor have
little effect on changing of peak corresponding period in relative input
energy spectrum. Overall, with engineering estimate and in the range of
damping ratios and ductility that have been studied in this research,
has been concluded that in inelastic behavior range, input energy
spectrum per unit mass has little sensitivity to changes of damping
ratio and ductility in wide range of periods, and it is a function of
structure’s period. Because lack of design engineer's awareness on real
amounts of damping ratio and ductility when designing structure, it is
one advantages of relative input energy spectrum.
Key Words:
Energy Spectrum, Damping Ratio, Displacement Ductility, Relative Input Energy, Input Energy Per Unit Mass
Authors in this article
-
Reza Vahdani
1
-
Mohsen Gerami
2
-
Mohamad Ali Vaseghi Nia
3
1
Assistant Professor, Department of Civil Engineering, Semnan
University, Semnan, Iran
2
Associate Professor, Faculty of Civil Engineering, Semnan
University, Semnan, Iran
3
PhD Student in Earthquake Engineering, Department of Civil
Engineering, Semnan University, Semnan, Iran
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