Eğilmez, Oğuz Özgür
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Egilmez, Oguz O.
Eğilmez, O
Egilmez, O.
Egilmez, O
Eğilmez, O.
Eğilmez, Oğuz Ö.
Egilmez, Oguz Ozguer
Egilmez, Oguz Ozgur
Egilmez, O. O.
Eğilmez, O. Ö.
Egilmez, O. Ozgur
Eğilmez, O. Özgür
Ozgur Egilmez, O.
Özgür Eğilmez, O.
Eğilmez, O
Egilmez, O.
Egilmez, O
Eğilmez, O.
Eğilmez, Oğuz Ö.
Egilmez, Oguz Ozguer
Egilmez, Oguz Ozgur
Egilmez, O. O.
Eğilmez, O. Ö.
Egilmez, O. Ozgur
Eğilmez, O. Özgür
Ozgur Egilmez, O.
Özgür Eğilmez, O.
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03.03. Department of Civil Engineering
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Former Staff
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
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Documents
13
Citations
98
Scholarly Output
20
Articles
10
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16895/9264
Supervised MSc Theses
6
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WoS Citation Count
95
Scopus Citation Count
114
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1
WoS Citations per Publication
4.75
Scopus Citations per Publication
5.70
Open Access Source
18
Supervised Theses
6
| Journal | Count |
|---|---|
| Journal of Bridge Engineering | 3 |
| Journal of Reinforced Plastics and Composites | 1 |
| Journal of Sandwich Structures and Materials | 1 |
| Journal of Structural Engineering | 1 |
| Proceedings of the International Colloquium on Stability and Ductility of Steel Structures, SDSS 2006 | 1 |
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Now showing 1 - 10 of 20
Article Citation - WoS: 8Citation - Scopus: 9Dynamic Behavior Predictions of Fiber-Metal Laminate/Aluminum Foam Sandwiches Under Various Explosive Weights(SAGE Publications, 2016) Baştürk, Suat Bahar; Tanoğlu, Metin; Çankaya, Mehmet Alper; Eğilmez, Oğuz ÖzgürApplication of blast tests causes some problems to characterize the performance of panels due to the drastic conditions of explosive medium. Real test has high safety concerns and is not easily accessible because of its extra budget. Some approaches are needed for the preliminary predictions of dynamic characteristics of panels under blast loading conditions. In this study, the response of sandwiches under blast effect was evaluated by combining quasi-static experiments and computational blast test data. The primary aim is to relate the quasi-static panel analysis to dynamic blast load. Based on this idea, lightweight sandwich composites were subjected to quasi-static compression loading with a special test apparatus and the samples were assumed as single degree-of-freedom mass-spring systems to include dynamic effect. This approach provides a simpler way to simulate the blast loading over the surface of the panels and reveals the possible failure mechanisms without applying any explosives. Therefore the design of the panels can be revised by considering quasi-static test results. In this work, the peak deflections and survivabilities of sandwiches for various explosive weights were predicted based on the formulations reported in the literature. Major failure types were also identified and evaluated with respect to their thicknesses.Article Citation - WoS: 16Citation - Scopus: 24Developing Polymer Composite-Based Leaf Spring Systems for Automotive Industry(Walter de Gruyter GmbH, 2018) Öztoprak, Nahit; Güneş, Mehmet Deniz; Tanoğlu, Metin; Aktaş, Engin; Eğilmez, Oğuz Özgür; Şenocak, Çiler; Kulaç, GedizComposite-based mono-leaf spring systems were designed and manufactured to replace existing mono-leaf metal leaf spring in a light commercial vehicle. In this study, experimentally obtained mechanical properties of different fiber-reinforced polymer materials are presented first, followed by the description of the finite element analytical model created in Abaqus 6.12-1 (Dassault Systemes Simulia Corp., RI, US) using the obtained properties. The results from the finite element analysis are presented next and compared with actual size experimental tests conducted on manufactured prototypes. The results demonstrated that the reinforcement type and orientation dramatically influenced the spring rate. The prototypes showed significant weight reduction of about 80% with improved mechanical properties. The hybrid composite systems can be utilized for composite-based leaf springs with considerable mechanical performance.Master Thesis Strength Requirements of Shear Diaphragms Used To Brace Steel I-Beams(Izmir Institute of Technology, 2014) Vardaroğlu, Mustafa; Eğilmez, Oğuz Özgür; Dönmez, Cemalettin; Dönmez, Cemalettin; Eğilmez, Oğuz ÖzgürLateral torsional buckling, also known as flexural torsional buckling is a failure mode that often controls the design of I-shaped steel beams during construction. In order to increase the lateral torsional buckling capacity of the girders in this stage, discrete or continuous bracing systems are often utilized in building and bridge constructions. Light gauge metal decking acts like a shear diaphragm and provides continuous lateral bracing to the beams. The building industry has long relied on metal decking to laterally support the beam top flanges. Bridge construction industry does not consider metal decking as a brace source due to the flexible connection between the girder and the diaphragm. However, recent studies have shown that metal sheeting can also be used in the bridge industry as construction bracing as long as the flexibility of the connections can be controlled by modifications. An adequate bracing system must possess sufficient strength and stiffness to control deformations and brace forces. A parametrical study was conducted to investigate the stiffness and strength of shear diaphragms used to brace stocky and slender steel I-beams. This thesis focuses on the strength requirements. The parametrical study consists of eigenvalue buckling analyses and large displacement analyses on a twin girder shear diaphragm system with various girder and metal deck configurations. A three-dimensional finite element analysis program was selected for the analyses. In the model metal deck-girder connections and the connection between adjacent decks are modeled respectively. Finite element model is verified by a full-scale twin-girder buckling test as the part of a previous study. According to the numerical study an equation is proposed for the estimation of the brace forces in the deck connections. The equation is shifted for possible deck and girder configurations.Article Citation - WoS: 6Citation - Scopus: 7Lateral Stiffness of Steel Bridge I-Girders Braced by Metal Deck Forms(American Society of Civil Engineers (ASCE), 2009) Eğilmez, Oğuz Özgür; Herman, Reagan S.; Helwig, Todd A.The lateral-torsional buckling capacity of steel bridge girders is often increased by incorporating bracing along the girder length. Permanent metal deck forms (PMDF) that are used to support the wet concrete deck during bridge construction are a likely source of stability bracing; however, their bracing performance is greatly limited by flexibility in the connections currently used with the formwork. This paper outlines results from a research study that assessed and improved the bracing potential of metal deck forms used in bridge applications. The research study included shear tests of PMDF panels, and also lateral displacement and buckling tests of twin girder systems braced with PMDF. This paper will provide key results from the shear panel tests and then focus on the lateral displacement tests. Parametric investigations of PMDF bracing behavior were conducted using finite-element analyses and the results from the lateral displacement tests served a critical role in calibrating the finite element models. This paper documents key results from lateral load tests of 17 girder-PMDF systems using a variety of bracing details and PMDF thickness values. © 2009 ASCEArticle Citation - WoS: 1Citation - Scopus: 1Çelik Köprü I-kirişlerine Yanal Destek Sağlayan Trapez Sac Kalıpların Mukavemeti(Turkish Chamber of Civil Engineers, 2009) Eğilmez, Oğuz Özgür; Alkan, DenizTrapez Sac Kalıplar (TSK) hem çelik bina hem de çelik köprü sektörlerinde beton döşemenin kalıp sistemi olarak sıklıkla kullanılmaktadırlar. TSK’ler her ne kadar bina inşaatlarında çelik I-kirişlere yanal destek sağlayıcı elemanlar olarak işlev görseler de, çelik köprü sektöründe trapez sac kalıplardan destek elemanları olarak yararlanılmasına izin verilmez. Ancak, önceki çalışmalar birleşim detayının geliştirilmesi durumunda TSK sisteminin kirişin yanal kararlılığına belirgin şekilde destek sağlayabildiğini göstermiştir. Bu makale halen devam etmekte olan ve TSK’lerin mukavemetinin incelendiği analitik bir çalışmanın ara sonuçlarını içermektedir. Geçmişte, TSK sistemleriyle desteklenen köprü kirişlerin genel burkulma davranışını irdeleyen basit sonlu elemanlar modelleri (SEM) kullanılmıştır. Bu çalışmada TSK’leri hem birbirlerine hem de kirişlere bağlayan vidalardaki kararlılık destek kuvvetlerini belilemek için kullanılan geliştirilmiş bir sonlu elemanlar modelinin sonuçlarına yer verilmiştir. Bu çözümleme sonuçları TSK’lerin içermesi gereken mukavemet ihtiyacını belirleyecek olan bir tasarım yönteminin geliştirilmesinde kullanılacaktır.Master Thesis Stiffnes Requirements of Shear Diaphragms Used To Brace Steel I-Beams(Izmir Institute of Technology, 2017) Akbaba, Andaç; Dönmez, Cemalettin; Eğilmez, Oğuz ÖzgürThe buckling capacity of steel I-beams can be increased by providing lateral bracing along the length of the beams by either cross-frames or diaphragms. Metal sheeting that is often used in steel building and bridge constructions to support the fresh concrete, acts like a shear diaphragm and provides continuous bracing to steel beams. In building industry, metal deck forms are considered as a lateral support to the beams. However, due to their flexible connection detail between the girder and shear diaphragm, metal deck forms are not considered as a brace source for bridge construction industry. But with the recent studies, by improvements of the flexible connection details, metal decking can be used as a bracing system. An adequate bracing system must possess sufficient stiffness and strength. A computational study was conducted to investigate stiffness requirements of shear diaphragms used to brace stocky and slender steel I-beams. Both doubly and singly symmetric sections were studied. The computational study consists of eigenvalue buckling analyses on perfectly straight twin-girder system braced by shear diaphragms and large deformation analyses with imperfect girders with different configurations of girder sections and spans. A three dimensional computer programme was utilized to perform analytical studies. Analytical model is verified by a full-scale twin-girder system laboratory test that is carried out on a previous study. Stiffness requirements have been proposed for shear diaphragms used to brace stocky and slender steel I-beams.Article Citation - WoS: 10Citation - Scopus: 13Buckling Behavior of Steel Bridge I-Girders Braced by Permanent Metal Deck Forms(American Society of Civil Engineers (ASCE), 2012) Eğilmez, Oğuz Özgür; Helwig, Todd A.; Herman, ReaganPermanent metal deck forms (PMDFs) are often used in the bridge industry to support wet concrete and other loads during construction. Although metal formwork in the building industry is routinely relied on for stability bracing, the forms are not permitted for bracing in the bridge industry, despite the large in-plane stiffness. The forms in bridge applications are typically supported on cold-formed angles, which allow the contractor to adjust the form elevation to account for changes in flange thickness and differential camber between adjacent girders. Although the support angles are beneficial toward the constructability of the bridge, they lead to eccentric connections that substantially reduce the in-plane stiffness of the PMDF systems, which is one of the reasons the forms are not relied on for bracing in bridge applications. This paper documents the results of an investigation focused on improving the bracing potential of bridge deck forms. Modifications to the connection details were developed to improve the stiffness and strength of the forming system. Research included buckling tests on a 15-m (50-ft) long, twin-girder system with PMDFs for bracing. In addition, twin-girder tests were also used to validate computer models of the bracing systems that were used for parametric finite-element analytical studies. The buckling test results demonstrated that modified connection details make PMDF systems a viable bracing alternative in steel bridges, which can significantly reduce the number of cross-frames or diaphragms required for stability bracing of steel bridge I-girders during construction.Article Citation - WoS: 31Citation - Scopus: 36Mechanical Behavior of Polypropylene-Based Honeycomb-Core Composite Sandwich Structures(SAGE Publications Inc., 2010) Sezgin, Fatma Erinç; Tanoğlu, Metin; Eğilmez, Oğuz Özgür; Dönmez, CemalettinThis article presents results from an experimental study, investigating the effects of core thickness on the mechanical properties of composite sandwich structures with polypropylene(PP)-based honeycomb core and glass fiber-reinforced polymer (GFRP) face-sheets fabricated by hand lay-up technique. Epoxy matrix and non-crimp glass fibers were used for the production of GFRP laminates. Flatwise compression (FC), edgewise compression (EC), three-point bending (3PB) and double cantilever beam (DCB) tests were performed to evaluate the mechanical behavior of the composite sandwich structures (CSSs). Based on the FC tests, an increase in the compressive modulus and strength was observed with an increase in the core thickness. For EC tests, peak loads up to crush of the sandwich panel is discussed using core thickness. According to the 3PB tests, a decrease in core shear stress and facesheet bending stress was observed as the core thickness increases. © SAGE Publications 2010.Master Thesis Experimental Study on Improving Local Buckling Behavior of Steel Plates Strengthened With Glass Fiber Reinforced Polymers(Izmir Institute of Technology, 2009) Güven, Can Ali; Eğilmez, Oğuz ÖzgürGlass Fiber Reinforced Polymer (GFRP) applications becoming one of the most efficient strengthening methods to improve mechanical properties of previously built steel structures. In strengthening applications FRP materials generally used in web or flange sections of steel members to provide a bracing against local buckling. By the help of their easy application and their tailorable mechanical properties, FRPs provide various options for selecting the most suitable FRP material for applications. This study focuses on using GFRP to enhance the buckling behavior of GFRPstrengthened steel plates under axial loading. For that purpose, a detailed experimental study program has been followed revealing mechanical properties of GFRP material, steel and interaction between steel-GFRP. Previous studies showed that the surface bond between GFRP and steel section as the weakest link of the structure. As a result of this, various epoxies, surface preparation primers, surface treatments are used to produce Lap-Shear specimens to provide most efficient surface interaction between GFRP and steel. Results of these experiments provided us data to decide most suitable surface treatment, surface primer and epoxy combination in the GFRP Strengthened Steel Plate Tests with the ability to in-situ application. 350x200x20 mm steel plates are strengthened with various thickness (2, 4 and 16 layers) and surface areas (80mm x 300mm, 160 x 300mm) of GFRP to compare the stabilization in buckling values with bare steel plates. Plates are strengthened with GFRP on both sides and they are tested in compression testing equipment. LVDTs are used to collect axial and lateral buckling while strain-gauges attached to both composite used to collect axial and lateral buckling while strain-gauges attached to both composite plates strengthened with GFRP material showed that application of GFRP provides enhancement to the plastic buckling of steel plates.Master Thesis Seismic Behavior of Steel I-Beams Modified by a Welded Haunch and Reinforced With Glass Fiber Reinforced Polymers(Izmir Institute of Technology, 2009) Özdemir, Timur; Eğilmez, Oğuz ÖzgürFlange and web local buckling in beam plastic hinge regions of welded steel moment frames (SMF) can prevent beam-column connections to achieve adequate plastic rotations under earthquake-induced forces. As the use of fiber reinforced polymers (FRP) have increased in strengthening and repair of steel members in recent years, using FRPs in stabilizing local instabilities have also attracted attention. Generally, high modulus carbon FRP (CFRP) laminates, with elastic modulus similar to that of steel, are preferred in strengthening applications. On the other hand, glass FRP (GFRP) has a much smaller modulus than that of steel, typically one order of magnitude less, which limits its use in strengthening applications. However, this modulus mismatch is an asset when the primary goal is to stabilize inelastic local buckling with the least possible strength increase in the section. In a steel-GFRP hybrid system, while the low modulus of GFRP will not allow a significant strength increase in the beam, the flexural strength of GFRP can provide bracing to the underlying steel, which is flowing plastically. In this research study, the cyclic behavior of steel beams modified by a triangular haunch welded to the beam bottom flange only and reinforced with GFRP laminates at beam flanges have been investigated by finite element analysis (FEA). Cantilever I-sections with flange-web slenderness ratios higher then those stipulated in current seismic design specifications are analyzed under reversed cyclic loading. Both bare beam sections and sections reinforced with GFRP are investigated. The effects of GFRP thickness, width, and length on stabilizing local buckling are investigated. The flexural resistance of the beams at column face, interlaminar shear stresses in GFRP strips, and shear stresses at beam-GFRP binding surface are examined. The results reveal that the plastic rotation capacity of steel beams can be enhanced by the use of GFRP strips.