HYSTERETIC ENERGY TO ENERGY INPUT RATIO SPECTRUM IN NONLINEAR SYSTEMS

Year 2016, Volume: 18 Issue: 53, 239 - 255, 01.05.2016

Bülent Akbaş Bora Akşar Bilge Doran Sema Alacalı

Abstract

Even though some empirical formulas for hysteretic energy (EH) to energy input (EI) ratio have been proposed in the literature, they all assume that this ratio is the same for any period range and do not consider either the ground motion properties or the structural properties. This paper presents a study on EH/EI in inelastic single-degree-of-freedom (SDOF) systems and relates it to the inelastic multidegree-of-freedom (MDOF) systems subject to severe earthquake ground motions. The response analyses are carried out through nonlinear dynamic time-history (NDTH) analyses on SDOF systems and steel moment resisting frames as MDOF systems for ninety EQGMs recorded on different soils. A spectrum for EH/EI ratio with different strength indices in SDOF systems is proposed based on the analyses results

Keywords

Hysteretic energy, Energy spectrum, NDTH analysis, nonlinear systems, SDOF systems, MDOF systems

DOĞRUSAL OLMAYAN SİSTEMLERDE HİSTERETİK ENERJİ /ENERJİ ORANI SPEKTRUMU

Abstract

Literatürde histeretik enerji (EH)/enerji oranı (EI) için bazı ampirik bağıntılar olmasına rağmen, tüm bu bağıntılar anılan oranı her bir periyot aralığı için sabit kabul etmekte ve deprem yer hareketi özellikleri veya yapısal özellikleri gözönüne almamaktadır. Bu çalışma, doğrusal olmayan tek serbestlik dereceli sistemler için EH/EI oranlarının hesabı üzerinedir ve çeşitli deprem yer hareketine maruz doğrusal olmayan çok serbestlik dereceli sistemlere adaptasyonu ile ilgilidir. Bu bağlamda, tek serbestlik dereceli sistemler ile çok serbestlik dereceli sistemlerin (moment aktaran çerçeveler) dinamik analizleri farklı zeminlerde kaydedilmiş doksan adet deprem hareketi dikkate alınarak doğrusal olmayan zaman tanım alanında hesap yöntemi ile gerçekleştirilmiş, analiz sonuçları doğrultusunda tek serbestlik dereceli sistemlere ait EH/EI oranı için spektrum önerilmiştir

Keywords

Histeretik enerji, Enerji spektrumu, Doğrusal olmayan zaman tanım alanında hesap, Doğrusal olmayan sistemler, tek serbestlik dereceli sistemler, Çok serbestlik dereceli sistemler

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