Eği̇lmez, Oğuz Özgür
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Egilmez, Oguz Ozguer
Egilmez, O. Ozgur
Egilmez, O. O.
Egilmez, Oguz O.
Egilmez, Oguz Ozgur
Egilmez, O. Ozgur
Egilmez, O. O.
Egilmez, Oguz O.
Egilmez, Oguz Ozgur
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ozgur.egilmez@ieu.edu.tr
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05.03. Civil Engineering
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Former Staff
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23
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148
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7
Documents
13
Citations
98
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7
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4
Scopus Citation Count
11
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1
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2
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WoS Citations per Publication
0.57
Scopus Citations per Publication
1.57
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| Journal | Count |
|---|---|
| Structural Stability Research Council Annual Stability Conference 2014, SSRC 2014 | 2 |
| Journal of Brıdge Engıneerıng | 1 |
| Journal of Structural Engıneerıng | 1 |
| Steel And Composıte Structures | 1 |
| Teknik Dergi | 1 |
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Article Stiffness Requirements for Shear Diaphragms Used for Stability Bracing of Slender Steel Beams(Turkish Chamber Civil Engineers, 2017) Eği̇lmez, Oğuz Özgür; Akbaba, Andac; Vardaroglu, MustafaThe buckling resistance 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 buildings and bridge constructions to support the fresh concrete, acts like a shear diaphragm and provides continuous bracing to steel beams. 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 slender steel I-beams. Both double and single symmetrical axis sections were studied. Beams that are braced by cross-frames in addition to diaphragms have also been investigated. Stiffness requirements have been proposed for shear diaphragms used to brace slender steel I-beams.Conference Object Citation - Scopus: 1Stiffness and Strength of Shear Diaphragms Used for Stability Bracing of Slender Beams(Structural Stability Research Council (SSRC), 2014) Eği̇lmez, Oğuz Özgür; Akbaba A.; Vardaroglu M.Light gage metal decking is often used in structures as concrete deck formwork, roof cladding or siding. In the steel building and bridge industries, decking acts like a shear diaphragm and provides continuous lateral bracing to the top flange of non-composite beams and girders that they are attached to. The building industry has long relied on the in-plane stiffness and strength of metal decking to brace steel beams during construction. Although the current AASHTO LRFD specifications do not allow bridge deck forms to be relied upon as a bracing source for steel bridge I-girders, recent studies have demonstrated that deck forms can significantly increase the buckling capacity of bridge girders by providing a relatively simple modification to the connection. Shear diaphragm bracing of steel I-beams have been studied in the past. These studies mainly focused on beams with stocky webs. The purpose of the study outlined in this paper is to enhance the understanding of both the stiffness and strength of shear diaphragms used to brace slender steel I-beams. The parameters that are investigated include diaphragm stiffness, sheet thickness, number of side-lap fasteners, flange width, and web slenderness ratio. Beams with web slenderness ratios of 100 to 160 and span/depth ratios of 10, 15, and 20 are considered. A simple finite element analytical (FEA) model is utilized in the study. The results indicate that web slenderness ratio does not have a major effect on fastener forces and the strength behavior of shear diaphragms is dependent on the number of side-lap fasteners. The findings of the study will be used to develop strength and stiffness requirements for shear diaphragms used to brace slender steel beams.Article Narin Çelik Kirişlere Stabilite Desteği Sağlayan Kayma Diyaframlarının Rijitlik Gereklilikleri(2017) Eği̇lmez, Oğuz Özgür; Akbaba, Andaç; Vardaroğlu, MustafaÇelik I-kirişlerin burkulma kapasitesi, noktasal veya sürekli destek elemanları kullanılarak artırılmaktadır. Yapım aşamasında taze betonu taşımak için kiriş uzunluğunca kullanılan trapez sac kalıplar, bir kayma diyaframı gibi davranırlar ve çelik kirişlere sürekli destek sağlarlarlar. Bir destek elemanının görevini yerine getirebilmesi için yeterli rijitliğe ve dayanıma sahip olması gerekmektedir. Narin gövdeli çelik kirişleri destekleyen kayma diyaframlarının rijitlik gerekliliklerini araştırmak için sayısal bir çalışma yapılmıştır. Çift ve tek simetri eksenli kesitler incelenmiştir. Kiriş orta açıklığında noktasal destek elemanı bulunduran kirişler de analiz edilmiştir. Narin gövdeli çelik I-kirişleri destekleyen kayma diyaframları için minimum rijitlilik gereklilikleri önerilmiştir.Conference Object Application of Diaphragm Stiffness and Strength Equations To Bridge Metal Deck Forms(Structural Stability Research Council (SSRC), 2014) Eği̇lmez, Oğuz Özgür; Helwig T.The building and bridge industries commonly use light gage metal sheeting for concrete formwork. The building industry has long relied on the in-plane strength and stiffness of metal forms to prevent lateral torsional buckling of the beams. The flexibility in the current connection details between the forms and girders in the bridge industry often limit the amount of bracing provided by these forms. In a recent research study, modified connection details were developed that substantially improve the bracing behavior of bridge metal deck forms. However, there is currently not a design aid that a bridge engineer can utilize to predict the stiffness and strength of bridge metal deck forms. Hence, specifying the right PMDF system for bracing purposes becomes troublesome. For applications in the building industry, the Steel Deck Institute (SDI) Diaphragm Design Manual provides numerical expressions to determine the stiffness and strength of various types of metal sheeting and their corresponding connection details. The expressions in the SDI Design Manual are not directly applicable to bridge metal deck forms since PMDF used in the bridge industry differ from those utilized in the building industry by both shape and connection detail. In this paper results from shear diaphragm tests on bridge metal deck forms with modified connection details are compared with SDI expressions. Results indicate that slightly modified SDI expressions can be used to predict the stiffness and strength of bridge metal deck forms with modified connection details.Article Predicting the Stiffness of Shear Diaphragm Panels Composed of Bridge Metal Deck Forms(Techno-Press, 2017) Egilmez, Oguz O.The behavior of building industry metal sheeting under shear forces has been extensively studied and equations have been developed to predict its shear stiffness. Building design engineers can make use of these equations to design a metal deck form bracing system. Bridge metal deck forms differ from building industry forms by both shape and connection detail. These two factors have implications for using these equations to predict the shear stiffness of deck form systems used in the bridge industry. The conventional eccentric connection of bridge metal deck forms reduces their shear stiffness dramatically. However, recent studies have shown that a simple modification to the connection detail can significantly increase the shear stiffness of bridge metal deck form panels. To the best of the author's knowledge currently there is not a design aid that can be used by bridge engineers to estimate the stiffness of bridge metal deck forms. Therefore, bridge engineers rely on previous test results to predict the stiffness of bridge metal deck forms in bracing applications. In an effort to provide a design aid for bridge design engineers to rely on bridge metal deck forms as a bracing source during construction, cantilever shear frame test results of bridge metal deck forms with and without edge stiffened panels have been compared with the SDI Diaphragm Design Manual and ECCS Diaphragm Stressed Skin Design Manual stiffness expressions used for building industry deck forms. The bridge metal deck form systems utilized in the tests consisted of sheets with thicknesses of 0.75 mm to 1.90 mm, heights of 50 mm to 75 mm and lengths of up to 2.7 m; which are representative of bridge metal deck forms frequently employed in steel bridge constructions. The results indicate that expressions provided in these manuals to predict the shear stiffness of building metal deck form panels can be used to estimate the shear stiffness of bridge metal deck form bracing systems with certain limitations. The SDI Diaphragm Design Manual expressions result in reasonable estimates for sheet thicknesses of 0.75 mm, 0.91 mm, and 1.21 mm and underestimate the shear stiffness of 1.52 and 1.90 mm thick bridge metal deck forms. Whereas, the ECCS Diaphragm Stressed Skin Design Manual expressions significantly underestimate the shear stiffness of bridge metal deck form systems for above mentioned deck thicknesses.Article Citation - WoS: 1Citation - Scopus: 3Strength Requirements for Shear Diaphragms Used for Stability Bracing of Steel Beams(Asce-Amer Soc Civil Engineers, 2017) Egilmez, O. Ozgur; Vardaroglu, Mustafa; Akbaba, AndacLight-gauge metal sheeting is often used in steel building and bridge industries as concrete deck formwork. Besides providing support to the fresh concrete, the sheeting acts as a shear diaphragm and provides continuous lateral bracing to the top flanges of the beams to which they are attached. An adequate stability-bracing system must possess sufficient stiffness and strength to control deformations and brace forces. Strength requirements for shear diaphragms are currently not well established. A computational study was conducted to develop strength requirements for shear diaphragms bracing simply supported steel beams. Both end-fastener and sidelap-fastener connections were modeled in the study. To the best of the authors' knowledge, this is the first study to quantify the stability-induced forces in sidelap fasteners. The effects of deck width and number of end and sidelap fasteners on brace forces were investigated. Expressions were developed to estimate the stability-induced brace forces in end-fastener and sidelap-fastener connections. (C) 2016 American Society of Civil Engineers.Article Citation - WoS: 3Citation - Scopus: 7Using Metal Deck Forms for Construction Bracing in Steel Bridges(Asce-Amer Soc Civil Engineers, 2016) Egilmez, O. Ozgur; Helwig, Todd A.; Herman, ReaganMetal deck forms are frequently used in the steel building and bridge industries as formwork for the wet concrete slab. Although the forms are often relied on for stability bracing during construction in buildings, conventional connection details between the forms and girder top flanges in the bridge industry possess an eccentricity that limits the bracing performance of the forms. A research study to assess and improve the bracing potential of permanent metal deck forms (PMDFs) used in bridge applications was conducted. Recommendations from the research study were implemented on two steel I-girder bridges located on the IH-610 north loop in Houston. The use of the PMDF bracing resulted in the elimination of 680 intermediate diaphragms from the bridges. Before the implementation project, laboratory buckling tests were conducted on a twin-girder system with members and bracing that were identical to those used in the implementation project. To the authors' knowledge, this project represents the first time that metal deck forms were relied on for stability bracing of steel I girders in the bridge industry. This paper documents laboratory testing, design, and construction of the two bridges in which PMDFs were used as construction bracing for the steel I girders in the bridge superstructure. Laboratory test results showed that the forming system, which was at the lower span limit of PMDF systems frequently used in steel bridge systems, could provide suitable bracing for the two implementation bridges. Using metal deck forms for bracing, the bridges were designed with no intermediate diaphragms/cross frames. A total of 680 intermediate diaphragms that would have been required in a bridge with conventional bracing were eliminated. The implementation of the research recommendations in the design of steel bridges can result in substantial improvements on the efficiency and economics of bracing systems for steel bridge superstructures.
