Onur Merter

Onur Merter
Izmir University of Economics · Civil Engineering

PhD

About

64
Publications
47,804
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133
Citations
Citations since 2017
35 Research Items
120 Citations
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2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
Introduction
Dr. Onur Merter currently works at the Department of Civil Engineering in Izmir University of Economics. Dr. Merter makes research in Earthquake Engineering and Structural Engineering fields. Their current project is 'Energy-based Seismic Design of Structures.'
Additional affiliations
April 2019 - present
Izmir University of Economics
Position
  • Professor (Associate)
July 2006 - November 2017
Dokuz Eylul University
Position
  • Research Assistant
Education
February 2008 - March 2014
Dokuz Eylul University
Field of study
  • Structural Engineering

Publications

Publications (64)
Article
Full-text available
Energy-based seismic design of structures has gradually become prominent in today’s structural engineering investigations because of being more rational and reliable when it is compared to traditional force-based and displacement-based methods. Energy-based approaches have widely taken place in many previous studies and investigations and undoubted...
Article
Full-text available
A modified energy-balance equation accounting for P-delta effects and hysteretic behavior of reinforced concrete members is derived. Reduced hysteretic properties of structural components due to combined stiffness and strength degradation and pinching effects, and hysteretic damping are taken into account in a simple manner by utilizing plastic ene...
Article
Full-text available
A nonlinear static procedure considering work-energy principle and global failure mechanism to estimate base shears of reinforced concrete (RC) frame-type structures is presented. The relative energy equation comprising of elastic vibrational energy, plastic strain energy and seismic input energy is obtained. The input energy is modified with a fac...
Conference Paper
Full-text available
In energy-based seismic design approach, effect of ground motions on structures is considered as an energy input to structures. The earthquake input energy spectra are created combining the maximum input energies of single-degree-of-freedom (SDOF) systems having a certain damping ratio for different natural vibration periods. The determination of i...
Article
Full-text available
In current seismic design codes, various elastic design acceleration spectra are defined considering different seismological and soil characteristics and are widely used tool for calculation of seismic loads acting on structures. Response spectrum analyses directly use the elastic design acceleration spectra whereas time history analyses use accele...
Article
Full-text available
The main purpose of the present study is to compute the input energy spectra of selected far-fault ground motions (GMs) for linear elastic systems, and inelastic systems having a constant ductility ratio. Elastic-perfectly plastic (EPP) and Modified Takeda hysteresis models have been adopted in nonlinear modeling of single-degree-of-freedom (SDOF)...
Conference Paper
Full-text available
Inelastic strength and displacement ductility demands imposed on several single-degree-of-freedom (SDOF) systems by Mw 6.9 Samos Island (Aegean Sea) earthquake are investigated. A batch of 51 ground motion accelerograms with two horizontal components are compiled from the accelerometric database of Disaster and Emergency Management Presidency (AFAD...
Conference Paper
Full-text available
Energy modification factors relating the energy absorbed by inelastic system to that of equivalent elastic system are investigated for single-degree-of-freedom (SDOF) systems subjected to pulse-like ground motions (GMs) recorded on hard rock-to-soft soil sites. A set of 71 pulse-like strong GMs recorded at different earthquake (EQ) events having a...
Conference Paper
Full-text available
In order to achieve an efficient energy-based design, it is of great importance to determine the nonlinear structural characteristic of multi-story structures in terms of seismic energy firstly. Yield base shear force, yield displacement and maximum inelastic displacement are the essential parameters for establishing the energy-based structural cap...
Article
Full-text available
Currently, prominent energy balance concept can efficiently be used to calculate the yield base shear force of structures. Energy balance equation is an additional constraint for the balance of seismic input energy by the energy absorption of the structure. This equation can be defined as the sum of elastic and plastic energies of structural system...
Article
Full-text available
Gauss–Newton algorithm is originally applied for estimating constant ductility energy factor spectra of near- and far-fault ground motions. First, constant-ductility energy factors are clarified, a three-parameter exponential equation relating energy factor to period is proposed and estimation of parameters of the proposed equation by means of Gaus...
Article
Full-text available
This paper proposes an energy based approach for estimating the yield force coefficient of reinforced concrete (RC) frame structures. The procedure is mainly based on the energy balance concept and it considers the nonlinear behavior of structures. First, an energy modification factor is defined to consistently obtain the total energy of the equiva...
Chapter
Full-text available
In energy-based seismic design of structures, ground motion effect is considered as an energy input to the systems. Consistent development of input energy spectra is of great importance for the energy-based seismic design since the total energy input to structural systems can be practically obtained by means of these graphs. The main purpose of the...
Conference Paper
Full-text available
In energy-based seismic design and evaluation of structures, strong ground motion effect is considered as an energy input to the systems. Inelastic structural behavior is possibly observed to resist the energy input due to strong ground motions. Total energy capacity of the inelastic structural system can be defined in terms of a specific multiplie...
Conference Paper
Full-text available
Determination of yield strength reduction factor, one of the main parameters characterizing nonlinear system, is quite essential both for force-based design and displacement-based evolution and design of structures subjected to earthquakes. Yield strength reduction factor, which is directly related to yield strength of the system, can either be cal...
Presentation
Full-text available
In energy-based seismic design and evaluation of structures, strong ground motion effect is considered as an energy input to the systems. Inelastic structural behavior is possibly observed to resist the energy input due to strong ground motions. Total energy capacity of the inelastic structural system can be defined in terms of a specific multiplie...
Conference Paper
Full-text available
In energy-based seismic design approach, effect of ground motions on structures is considered as an energy input to structures. The earthquake input energy spectra are created combining the maximum input energies of single-degree-of-freedom (SDOF) systems having a certain damping ratio for different natural vibration periods. The determination of i...
Presentation
Full-text available
Structural Dynamics and Earthquake Engineering
Conference Paper
Full-text available
The investigation of earthquake ground motion characteristics is a key issue of earthquake engineering. Near-fault ground motions are more severe than the other ground motions and they often exhibit distinguishable pulse-like features in their velocity time histories. The earthquake input energy depends upon the velocity time history and so the nea...
Presentation
Full-text available
The investigation of earthquake ground motion characteristics is a key issue of earthquake engineering. Near-fault ground motions are more severe than the other ground motions and they often exhibit distinguishable pulse-like features in their velocity time histories. The earthquake input energy depends upon the velocity time history and so the nea...
Conference Paper
Full-text available
Traditional strength-based and more recently adopted displacement-based methods are effectively used in seismic design and evaluation of large variety of structures. Alternatively, the use of energy-based methods referred to as more reliable on scientific platforms has been examined by many researchers in the last decades. The prediction of earthqu...
Presentation
Full-text available
Ductility Effect on Inelastic Input Energy Spectra
Article
Full-text available
Recent earthquakes show that the strength and displacement-based methods in many seismic design codes are not as reliable as the energy-based methods in seismic design and evaluation of structures. The determination of earthquake energy input to structures is the main concern for the energy-based structural design methods. The seismic energy input...
Article
Full-text available
Yapı sistemlerinin doğrusal olmayan analizi ve tasarımında enerji kavramına dayalı hesaplamalar, yer değiştirme esaslı yöntemlere bir alternatif olarak gelişmektedir. Enerjiye dayalı yapı tasarımı aynı zamanda yer değiştirme kavramını da içermekte ve diğer analizlere kıyasla daha rasyonel bir yöntem olarak anılmaktadır. Çalışmada kullanılan yöntemd...
Conference Paper
Full-text available
Turkey experienced two major earthquakes in 1999 in North Anatolian Fault region. Earthquakes occurred in the cities of Kocaeli and Duzce where the population density was not low. Epicenters of earthquakes were located in provinces where are very near İstanbul, the largest city of Turkey. Therefore, these earthquakes exceeding magnitude seven were...
Presentation
Full-text available
Turkey experienced two major earthquakes in 1999 in North Anatolian Fault region. Earthquakes occurred in the cities of Kocaeli and Duzce where the population density was not low. Epicenters of earthquakes were located in provinces where are very near İstanbul, the largest city of Turkey. Therefore, these earthquakes exceeding magnitude seven were...
Article
Full-text available
In energy-based seismic design approach, earthquake ground motion is considered as an energy input to structures. The earthquake input energy is the total of energy components such as kinetic energy, damping energy, elastic strain energy and hysteretic energy, which contributes the most to structural damage. In literature, there are many empirical...
Research
Full-text available
Energy Concept in Structural and Earthquake Engineering (In Turkish)
Conference Paper
Full-text available
Belirli bir yer hareketi etkisinde yapıya giren enerji yapı içerisinde kinetik enerji, elastik şekil değiştirme enerjisi, sönüm enerjisi ve histeretik enerji olarak dağılmakta ve bir kısmı depolanırken diğer kısmı sönüm ve doğrusal olmayan davranış yoluyla tüketilmektedir. Enerji kavramlarına dayalı tasarımda yapının enerji tüketme kapasitesinin ye...
Presentation
Full-text available
Belirli bir yer hareketi etkisinde yapıya giren enerji yapı içerisinde kinetik enerji, elastik şekil değiştirme enerjisi, sönüm enerjisi ve histeretik enerji olarak dağılmakta ve bir kısmı depolanırken diğer kısmı sönüm ve doğrusal olmayan davranış yoluyla tüketilmektedir. Enerji kavramlarına dayalı tasarımda yapının enerji tüketme kapasitesinin ye...
Article
Full-text available
Determination of capacities of structural members, both in terms of strength and deformation, and estimation of seismic demand are essential issues in earthquake-resistant design. In energy-based design and evaluation, both the structural capacity and the demand imposed by earthquake are considered in terms of energy and accordingly energy dissipat...
Article
Full-text available
An energy-based approach for determining earthquake safety of reinforced concrete frame structures is presented. The developed approach is based on comparison of plastic energy capacities of the structures with plastic energy demands obtained for selected earthquake records. Plastic energy capacities of the selected reinforced concrete frames are d...
Article
Full-text available
Bu çalışmada, klasik iş-enerji bağıntısı ve yapı için önceden hedeflenen ideal bir göçme mekanizmasının esas alınması ile deprem etkileri altında doğrusal elastik ötesi davranış gösteren betonarme çerçeve türü yapılar için genel enerji denkleminden hareketle taban kesme kuvveti hesaplanmaktadır. Yapısal sönümden dolayı, depremle birlikte yapı siste...
Conference Paper
Full-text available
Elastic design acceleration spectra defined in seismic design codes, are widely used to determine seismic loads acting on structures. Response spectrum analysis directly uses the elastic design acceleration spectra. However, linear and nonlinear time history analyses are performed by using earthquake acceleration records and the response spectra of...
Article
Full-text available
Many questions about nonlinear behavior of RC sections can be answered by the help of moment-curvature relations which can be obtained from experimental ways or theoretical approach by considering material stress- strain curves. Area of the moment-curvature relation of the section from yield curvature to ultimate curvature expresses the inelastic e...
Conference Paper
Full-text available
Bu çalışmada farklı deprem hesap yöntemlerinden elde edilecek kuvvet ve yerdeğiştirme tipindeki tasarım büyüklüklerinin karşılaştırılması amaçlanmıştır. 3, 5 ve 8 katlı betonarme çerçevelerin doğrusal elastik deprem hesabı Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik’de verilen hesap yöntemleri kullanılarak gerçekleştirilmiştir. Çerçev...
Presentation
Full-text available
Bu çalışmada farklı deprem hesap yöntemlerinden elde edilecek kuvvet ve yerdeğiştirme tipindeki tasarım büyüklüklerinin karşılaştırılması amaçlanmıştır. 3, 5 ve 8 katlı betonarme çerçevelerin doğrusal elastik deprem hesabı Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmelik’de verilen hesap yöntemleri kullanılarak gerçekleştirilmiştir. Çerçev...
Article
Full-text available
This article proposes a new approach to predict the plastic drifts and damage states of reinforced concrete frame type structures subjected to monotonic loading. The approach uses plastic energy demand graphs which are determined from nonlinear time history analyses. Plastic energy graphs are obtained by converting the hysteretic moment rotation re...
Presentation
Full-text available
Çağdaş deprem yönetmeliklerinde yapıların tasarımına yönelik elastik deprem yüklerinin tanımlanmasında belirli bir deprem tehlikesi ve zemin sınıfı için esas alınan tasarım ivme spektrumları kullanılmaktadır. Farklı ülke yönetmeliklerinde verilen elastik tasarım ivme spektrumlarına ait spektral eğriler genel olarak birbirine benzemekle birlikte, di...
Presentation
Full-text available
Mod Birleştirme Yöntemi ve Zaman Tanım Alanında Hesap Yöntemi tüm deprem bölgelerindeki bina ve bina türü yapıların deprem hesabında herhangi bir yapısal düzensizlik ve yükseklik sınırı gibi belirli kısıtlamalar dikkate alınmaksızın kullanılabilmektedir. Bu iki yöntemden Mod Birleştirme Yöntemi’nde, elastik tasarım ivme spektrumu ordinatları belli...
Conference Paper
Full-text available
Mod Birleştirme Yöntemi ve Zaman Tanım Alanında Hesap Yöntemi tüm deprem bölgelerindeki bina ve bina türü yapıların deprem hesabında herhangi bir yapısal düzensizlik ve yükseklik sınırı gibi belirli kısıtlamalar dikkate alınmaksızın kullanılabilmektedir. Bu iki yöntemden Mod Birleştirme Yöntemi'nde, elastik tasarım ivme spektrumu ordinatları belli...
Conference Paper
Full-text available
Çağdaş deprem yönetmeliklerinde yapıların tasarımına yönelik elastik deprem yüklerinin tanımlanmasında belirli bir deprem tehlikesi ve zemin sınıfı için esas alınan tasarım ivme spektrumları kullanılmaktadır. Farklı ülke yönetmeliklerinde verilen elastik tasarım ivme spektrumlarına ait spektral eğriler genel olarak birbirine benzemekle birlikte, di...
Article
Full-text available
This paper presents a comprehensive work on determination of yield base shear coefficient and displacement ductility factor of three to eight story actual reinforced concrete buildings, instead of using generic frames. The building data is provided by a walkdown survey in different locations of the pilot areas. Very detailed three dimensional model...
Article
Full-text available
Inelastic deformation and plastic energy dissipation capabilities of reinforced concrete sections without any local and total collapse have an importance for earthquake safety in order to achieve limiting damage. Calculation of plastic energy dissipation of reinforced concrete frames due to nonlinear behavior is investigated. Nonlinear static pusho...
Article
Full-text available
Gerçek malzeme davranışları esas alınarak veya deneysel yoldan elde edilen eğilme momenti-eğrilik ilişkisi yardımıyla kesitlerin elastik ötesi davranışı ile ilgili birçok soruya cevap bulunabilmektedir. Kesit akma eğriliğinden en büyük eğrilik değerine kadar olan eğilme momenti-eğrilik grafiğinin alanı, elastik ötesi davranışta kesitte tüketilen en...
Article
Full-text available
In earthquake-prone countries, structures may be exposed to several seismic loads in any stage of building's life. It is expected that the structures designed by engineers will show ductile behaviour under the effect of vertical and lateral loads and remain stable without making a sudden collapse. In consequence of nonlinear behaviour, plastic hing...
Article
Full-text available
Both static and dynamic analysis methods, which may be linear elastic or nonlinear, are used for structural analysis of structures. In nonlinear analysis methods, geometric nonlinearity and behaviour of material beyond linear elastic limit are taken into consideration. Artificial or recorded ground motions are used in nonlinear dynamic analysis, wh...
Article
Full-text available
The methods which take place in current building codes and used in seismic design of structures are generally linear elastic. Inelastic behavior of the structures under the effect of earthquake is considered indirectly in seismic design codes. Recent studies enable inelastic behavior of structures to be taken into account properly in the structural...
Article
Full-text available
Binaların deprem hesabı için Deprem Yönetmeliği-2007’de verilen yöntemlerin her birinde binaya etkiyen deprem yüklerinin farklı şekilde hesaplanması, analizde her üç yöntemin de kullanılabileceği durumlarda hesap yönteminin seçimini gündeme getirmektedir. Yönetmelikte verilen elastik tasarım ivme spektrumları kullanılarak Eşdeğer Deprem Yükü Yöntem...
Conference Paper
Full-text available
The behavior of a reinforced concrete section is generally characterized with moment-curvature relationship. Elastic and inelastic behavior parameters of the section such as strength, ductility and energy dissipation capacity can be obtained by using the moment curvature relation. One of the most important parameter of the inelasticbehavior is the...
Presentation
Full-text available
The behavior of a reinforced concrete section is generally characterized with moment-curvature relationship. Elastic and inelastic behavior parameters of the section such as strength, ductility and energy dissipation capacity can be obtained by using the moment curvature relation. One of the most important parameter of the inelastic behavior is the...
Article
Full-text available
The objective of this paper is to present an energy-based method for calculating target displacement of RC structures. The method, which uses the Newmark-Hall pseudo-velocity spectrum, is called the "Pseudo-velocity Spectrum (PSVS) Method". The method is based on the energy balance concept that uses the equality of energy demand and energy capacity...
Article
Full-text available
Zemin katları genellikle ticari amaçlı kullanılan konut türü binalarda zemin kat yüksekliğinin diğer kat yüksekliklerine göre fazla yapılması yaygın bir uygulamadır. Bunun sonucunda zemin kat kolonlarının narinlik oranı artmakta ve bu durum deprem etkileri altında kritik kat olarak kabul edilen zemin katın davranışının tekrar incelenmesini gerektir...
Article
Full-text available
Günümüz yönetmeliklerinde yer alan ve yapıların yatay yük analizinde kullanılan yöntemler genellikle doğrusal elastik yöntemler olup, deprem etkisi altında yapıların elastik ötesi davranışı hesaplarda dolaylı olarak dikkate alınmaktadır. Son yıllarda yapılan çalışmalar, yapının elastik ötesi davranışının hesaplara daha gerçekçi şekilde dahil edilme...
Article
Full-text available
Günümüzde depreme dayanıklı yapı tasarımı genellikle dayanım ve yer değiştirme esaslı yöntemlerle gerçekleştirilmektedir. Dayanım esaslı tasarım yöntemlerinde, dış yükler altında taşıyıcı sistem elemanlarında oluşacak iç kuvvetlerin elemanların taşıma gücünü aşmaması gerekmektedir. Yer değiştirme esaslı yöntemlerde, deprem etkisi altındaki yapının...
Conference Paper
Full-text available
The goal of this research is to determine the expected peak displacement of frame structures. In the study, inelastic spectral displacements of steel frames are determined using the method in the Turkish Earthquake Code, 2007. After the target displacements of frames are calculated, steel frames are pushed to that peak displacement value and latera...
Conference Paper
Full-text available
In this study, an energy-based method is presented for calculation of target displacement of a structure. The method is based on an evaluation of energy demand and capacity diagram of the structure. Non-linear static pushover analyses are performed firstly and then capacity curve is converted to an energy capacity diagram of the structure. The expe...
Article
Full-text available
Günümüzde, deprem bölgelerindeki çok katlı betonarme binalarda rüzgar ve deprem gibi yatay yüklerin karşılanması ve göreli kat ötelenmelerinin sınırlandırılması amacıyla perdeler yaygın olarak kullanılmaktadır. Kat planındaki yerleri genellikle mimari tasarımın sonucu olarak ortaya çıkan perdelerin bu yerleşimi ve alanları deprem etkisindeki davran...
Conference Paper
Full-text available
The type of yield mechanism plays an important role while evaluating a structure subjected to earthquake forces. Plastic hinges may occur at some special points in the structure as a result of earthquake ground motions. Before designing a new structure, a plastic yield mechanism may be selected for calculating the design forces. If the strong colum...
Technical Report
Full-text available
Yapı sistemlerinin depreme dayanıklı tasarımı; kuvvet esaslı, yer değiştirme esaslı ve enerji esaslı hesap yöntemleri ile gerçekleştirilebilmektedir. Kuvvet (dayanım) esaslı yöntemlerde, yapıya etkiyen dış yükler altında oluşacak eleman iç kuvvet değerlerinin, taşıyıcı sistem elemanlarının taşıma gücünden büyük olmaması esas alınmaktadır. Yer değiş...

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Project (1)
Project
Energy-based Seismic Design of Structures