Deprem Giriş Enerjisi İle Spektral Hız Arasındaki İlişkinin İrdelenmesi

Year 2020, Volume: 22 Issue: 66, 825 - 839, 22.09.2020

Ahmet Güllü

https://doi.org/10.21205/deufmd.2020226617

Abstract

Deprem
etkisine göre tasarım için önerilen enerji esaslı analiz yöntemleri sahip
oldukları üstünlükler nedeniyle gün geçtikçe daha fazla ilgi görmektedir.
Analizde depremin süresi ve frekans içeriğinin dikkate alınabiliyor olması bu
tür yöntemlerin en önemli üstünlükleridir. Enerji esaslı analiz yöntemlerinin
başarılı sonuç üretebilmesi için yapı sistemine giren deprem enerjisinin “doğru”
tahmini önem taşımaktadır. Enerji denge denkleminin çözümüyle giren deprem
enerjini elde etmek zahmetli bir işlem olduğundan, bu büyüklük literatürde genellikle
eşdeğer spektral hız cinsinden ifade edilmektedir. Bu ilişkinin sadece sönümsüz
sistemler için geçerli olacağı literatürde tartışılmaktadır. Bu bağlamda, yapısal
sönümün yapıya aktarılan deprem enerjisi ile eşdeğer hız arasındaki ilişkiye
olan etkisi bu çalışmada kanıtlanmıştır. Çok sayıda deprem kaydı ve farklı
sönüm özellikleri için zaman tanım alanında analizler gerçekleştirilmiştir.
Deprem kayıtlarının seçiminde kayma dalgası hızı (V_s30) ve kayıt
türü (sıradan ve darbe etkili) değişkenleri dikkate alınmıştır.
Gerçekleştirilen analizler sonucunda, yapıya aktarılan deprem enerjisi ile
eşdeğer spektral hız arasındaki ilişkinin farklı sönüm özellikleri için aynı
olmadığı görülmüştür. Mevcut ilişki için yeni katsayılar önerilmiştir.

Keywords

Giren enerji, spektral hız, enerji denge deklemi, enerji esaslı sismik tasarım

Evaluation of the Relation between Seismic Input Energy and Spectral Velocity

Abstract

Energy based
seismic design concept is getting attention owing to its advantages over the
conventional methodologies. Particularly, the consideration of duration and
frequency content of the earthquake record are chief superiority of the
concept. For this original design procedure, accurate determination of seismic
input energy is crucially important. Because of solving energy balance equation
is a tedious job, the seismic input energy is determined in terms of equivalent velocity in the literature
mostly. However, it was also shown that this relation is valid for only
undamped systems. Therefore, this study aims to provide the nonsteady relation
between seismic input energy and equivalent velocity for damped systems.
Intensive response history analyses were performed by using plenty of earthquake
records those were selected by considering the impulsive characteristics
(ordinary and pulse-like) and shear wave velocity. It was found that the
relation given in the literature for seismic input energy and spectral velocity
relation is not true for damped systems. Dependently, it is proposed a set of
coefficients considering structural damping properties to modify the existing
relation.

Keywords

Input energy, Spectral velocity, Energy balance equation, energy based seismic design

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