Browsing by Author "Tunc, Gokhan"

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A Factory in a Time of Turmoil: The Establishment and Engineering of the Büyükdere Match Factory in 1930s Istanbul
(MDPI, 2025) Tunc, Gokhan; Tunc, Tanfer Emin; Civil Engineering; 06. School Of Engineering; 01. Atılım University
The Republic of Turkey established its first match factory in Sinop in 1929 but had to relocate it even before it was in operation due to severe structural damage caused by ground settlement. In July 1930, through his US-based firm the American-Turkish Investment Corporation (ATIC), the Swedish "Match King" Ivar Kreuger signed a contract with the Republic of Turkey to build and operate a factory in B & uuml;y & uuml;kdere, Istanbul. By 1930, Kreuger had already established a match production monopoly in nearly every country in Europe and that year created a similar financial system for Turkey, gaining control of match production for 25 years. This article explains the events surrounding the establishment of his modern production facility in Turkey, with a particular focus on its engineering aspects. It details the strategically chosen location, the engineering solutions for the factory's construction, its production lines, and what the country gained and lost from it. In order to determine the establishment and production processes of the facility, the authors examined domestic and foreign archival documents, firsthand news reports from the period, articles and theses, and all other available documents. After the contract was terminated by both parties, the Turkish government and ATIC, in May 1943, the factory continued its production and storage activities until May 1989. At that point, the factory and all its equipment were integrated into another existing facility in the & Idot;neg & ouml;l district of Bursa province. Almost all the buildings of the B & uuml;y & uuml;kdere Match Factory were demolished, and the land was repurposed for a 450-bed regional hospital in 2012. In short, this article deploys the B & uuml;y & uuml;kdere Match Factory as a case study to examine what Turkey gained and lost from the establishment and production processes of a modern industrial factory, enabled by US-Turkish collaboration, and equipped with the most advanced manufacturing and engineering technologies of the time.
Citation - WoS: 2
Citation - Scopus: 2
A Close Examination of Ankara's Reinforced Concrete Buildings Designed and Constructed Between 1923 and 1938
(Mdpi, 2023) Tunc, Gokhan; Tunc, Tanfer Emin; Civil Engineering; 06. School Of Engineering; 01. Atılım University
The Republic of Turkey was established in 1923 out of the remains of the Ottoman Empire. Between 1923 and 1938, the Turkish republic underwent fifteen years of rapid expansion and growth, with Ankara as its new capital and Mustafa Kemal Ataturk (1881-1938) as its first president. During this period, reinforced concrete (RC) played a significant role in the construction of Ankara's public-use buildings. This study focuses on 57 of these structures, built either partially, or entirely, out of RC. The buildings are classified with respect to their duration, soil properties, foundation types, structural design details, construction types, materials and overall costs. In order to provide a better picture of the time period in which these buildings were designed and constructed, the technical, financial and political aspects of the projects, and the difficulties and challenges involved in their design and construction, are also discussed. Furthermore, this study outlines the impact of foreign engineers, construction workers, firms and the educational system on the development of civil engineering and use of RC in Turkey.
Citation - WoS: 1
Citation - Scopus: 1
Cold War Aviation: American Technology Transfer and the Construction of Turkey's First International Civilian Airport in Yeşilköy, Istanbul, 1944-1953
(Cambridge Univ Press, 2024) Tunc, Tanfer Emin; Tunc, Gokhan; Civil Engineering; 06. School Of Engineering; 01. Atılım University
With the economic and political support of the United States, in July 1947, Turkey signed contracts withthe Westinghouse Electric International Company and J.G. White Engineering Corporation to constructits first international civilian airport, Istanbul'sYe & scedil;ilk & ouml;y Airport. As this article will argue, the buildingof Ye & scedil;ilk & ouml;y (1949-53), through a partnership with two American engineering firms, is essentially anearly Cold War narrative of transnational exchange involving the multidirectional flow of technicalknowledge, expertise and resources between the United States and Turkey; the circulation of geopol-itically significant (and frequently competing) military, civilian and government actors; and thelocal and global implications of these transmissions. Yet the Ye & scedil;ilk & ouml;y construction narrative also illus-trates how post-war technology transfer was a highly political process of constant adaptation, modifi-cation and negotiation. Fraught with unforeseen friction and thorny challenges, Ye & scedil;ilk & ouml;y exemplifiesthe complicated American Cold War strategy of creating and maintaining alliances through engineeringknowledge, personnel and practices, often with unintended consequences. Moreover, as a case study,Ye & scedil;ilk & ouml;y opens a new window into the cautious science diplomacy that occurred along the IronCurtain, while filling a notable historiographic gap with respect to aviation in early Cold War Turkey.
Citation - WoS: 7
Citation - Scopus: 6
Constructing Containment: Thompson-Starrett, the Cesme Beach Houses, and the Geopolitics of American Engineering in Cold War Turkey
(Routledge Journals, Taylor & Francis Ltd, 2020) Tunc, Tanfer Emin; Tunc, Gokhan; Civil Engineering; 06. School Of Engineering; 01. Atılım University
For the first half of the twentieth century, Thompson-Starrett and Co., a New York-based American engineering, construction, and contracting firm, dominated the building scene. In operation between 1899 and 1968, it was a leader in skyscraper construction and large-scale projects, and literally built the New York skyline. It designed and constructed the tallest skyscraper of the era, the Woolworth Building, as well as other iconic Manhattan structures such as the Equitable Building, the American Stock Exchange, the New York Municipal Building, and the Claridge, Algonquin, Roosevelt, St. Regis, and Waldorf-Astoria Hotels. A formidable pioneering force in structural engineering a hundred years ago, Thompson-Starrett is, by and large, forgotten today, especially its post-World War II ventures in Turkey, such as the Sariyar Dam and the cesme Beach Houses, a luxury beachfront cooperative located in Ilica, Izmir. However, what would prompt the engineering firm responsible for the Woolworth Building to take on the road and utility construction and project management of a Turkish summer resort? The answer lies in Cold War geopolitics and booming private enterprise, both of which, in the 1950s, converged in Turkey, relied on American engineering, and involved a complex process of Americanization.
Citation - WoS: 14
Citation - Scopus: 14
Damage Observation of Reinforced Concrete Buildings After 2020 Sivrice (elazig) Earthquake, Turkey
(Asce-amer Soc Civil Engineers, 2021) Cenan Mertol, Halit; Tunc, Gokhan; Akis, Tolga; Civil Engineering; 06. School Of Engineering; 01. Atılım University
An earthquake with a magnitude of M-w = 6.8 and a depth of approximately 8.06 km occurred on January 24, 2020, with the epicenter near the town of Sivrice in Elazig province, Turkey. The earthquake resulted in numerous collapses and severe structural damage to the buildings located in the downtowns and villages of Elazig and Malatya provinces. A technical team investigated the earthquake-affected areas, and this study presents their observations and findings with respect to reinforced concrete buildings. It was concluded that almost all of the collapsed or severely-damaged reinforced concrete buildings were constructed between 1975 and 1998. The design and construction of these buildings did not comply with the specifications of the Turkish earthquake codes valid at that time. The failures and severe damage of the buildings are associated with poor material quality, inadequate reinforcement configuration, and framing problems related to their lateral load-carrying systems. Therefore, it is recommended that buildings constructed between 1975 and 1998 in the region be structurally re-evaluated to avoid additional loss of life and property in future earthquakes. (C) 2021 American Society of Civil Engineers.
Citation - WoS: 5
Citation - Scopus: 5
Engineering the Public-Use Reinforced Concrete Buildings of Ankara During the Early Republic of Turkey, 1923-1938
(Pergamon-elsevier Science Ltd, 2022) Tunc, Gokhan; Tunc, Tanfer Emin; Civil Engineering; 06. School Of Engineering; 01. Atılım University
Today, reinforced concrete (RC) is the most commonly used construction material in Turkey. It first emerged in Europe in the 1850s and was adopted in a number of Late Ottoman period structures, mostly in Istanbul, during the first two decades of the twentieth century. During the Early Turkish Republic (1923-1938), RC appeared in public-use buildings in Ankara, such as the Ethnographic Museum, which was the first in the new capital to feature RC elements, leading the way for many more structures to come. Despite the fact that Turkish and foreign civil engineers faced a series of economic, social, cultural, political, educational and technical challenges during the transition from masonry and timber construction to RC, its adoption was facilitated by the fact that as a European building technology, it became symbolically important to the new republic. Equated with modernity, RC would allow its capital, Ankara, to construct an identity that would contrast with Istanbul, the capital of the Ottoman Empire. This transition would also be catalyzed by the rise of a professional class of Turkish civil engineers who deployed RC to reinforce their authority as trained specialists and agents of modernization.
Citation - WoS: 9
Citation - Scopus: 9
Evaluation of Masonry Buildings and Mosques After Sivrice Earthquake
(Croatian Soc Civil Engineers-hsgi, 2021) Mertol, Halit Cenan; Tunc, Gokhan; Akis, Tolga; Civil Engineering; 06. School Of Engineering; 01. Atılım University
The evaluation of masonry and mosque type structures after the Sivrice Earthquake is presented in this study. Stone masonry buildings exhibited damage such as vertical cracks and splitting at corners, wedge shaped corner failures, diagonal cracking on walls, out-of-plane splitting of walls, and separation of walls from flooring/roofing systems. On the other hand, the separation of flags and caps of minarets was a common example of damage in mosques. Future earthquake damage can be prevented by following design codes and providing adequate supervision for new structures, while strengthening measures are recommended for the existing buildings.
Citation - WoS: 3
Citation - Scopus: 6
Experimental Analysis of the Behavior of Composite Column-Reinforced Concrete Beam Joints
(Springer Heidelberg, 2021) Tunc, Gokhan; Dakhil, Abdulrrahman; Mertol, Halit Cenan; Civil Engineering; 06. School Of Engineering; 01. Atılım University
This study assesses the seismic performance of steel-reinforced concrete (SRC) composite columns connected to reinforced concrete (RC) beam joints, and their ability to dissipate seismic energy through inelastic deformations. In this article, experimental aspects regarding the seismic performance of high-ductility and low-ductility steel-concrete composite frame were investigated. The principle design parameter in this study was ductility, which is considered a conceptual framework in Efficiency-Based Seismic Engineering. Thus, attention was focused on assuring various ductility ranges of joints obtained through a detailed study of the Turkish Earthquake Code (TEC 18) [Ministry of Public Works and Housing.: Turkiye Bina Deprem Yonetmeligi (Turkey's Earthquake Code for Buildings). Official Gazette (2018) (in Turkish).]. After identifying deficiencies and the energy dissipation capacity in the newly proposed joints, two half-scaled frames with specific ductility-related designs were constructed, instrumented, tested, and analyzed. The specimens were tested under displacement-controlled lateral cyclic loading that incorporated constant axial loading to create cyclic tension and compression facets across the joint areas. The test results proved that the SRC column-RC beam frames employing an extra column reinforcement ratio exhibit slightly better seismic performance. Due to the presence of structural steel, the shear failure of the joint was effectively prevented, even after the formation of the plastic hinge on the interface of the beam. During the testing, the column rebars, to some extent, made a minor contribution to the joint strength of the specimen compared to the structural steel that absorbed almost all of the load applied to the frame.
Citation - WoS: 5
Citation - Scopus: 6
Finite Element Analysis of Frames With Reinforced Concrete Encased Steel Composite Columns
(Mdpi, 2022) Tunc, Gokhan; Othman, Mohammed Moatasem; Mertol, Halit Cenan; Civil Engineering; 06. School Of Engineering; 01. Atılım University
Structural frame systems that consists of concrete-encased-steel-embedded composite columns and reinforced concrete beams are typically used in mid-rise to tall buildings. In order to understand their overall structural behavior, a total of 12 frame models with high and low ductility features were constructed and analyzed using LS-DYNA software. Two of these models were validated using the results of previously tested frames. The remaining 10 models were studied to predict the behavior of frames with varying concrete strengths, reinforcement configurations, and structural steel sections under vertical and lateral loads. The results were investigated in terms of cracks and failure patterns, load-deflection relationships, energy dissipation, and stiffness degradation. The analytical results indicated that the high ductile frame models showed slightly better lateral load carrying performances compared to low ductility frame models. Moreover, the analytical studies demonstrated that the existence of structural steel in a column, regardless of its cross-sectional shape, was the most important parameter in improving the lateral load carrying capacity of a frame.
Citation - WoS: 38
Citation - Scopus: 50
Investigation of Rc Buildings After 6 February 2023, Kahramanmaras, Turkiye Earthquakes
(Mdpi, 2023) Mertol, Halit Cenan; Tunc, Gokhan; Akis, Tolga; Kantekin, Yunus; Aydin, Ishak Can; Civil Engineering; Department of Civil Engineering; 15. Graduate School of Natural and Applied Sciences; 06. School Of Engineering; 01. Atılım University
Two major earthquakes struck Pazarcik and Elbistan, towns in Kahramanmaras, Turkiye, on 6 February 2023, approximately 9 h apart. The first earthquake, recorded at 04:17 local time, had a M-w = 7.7, with a focal depth of 8.6 km. At 13:24 local time, a second earthquake occurred with M-w = 7.6 at a focal depth of 7 km, approximately 90 km north of the first one. A total of 11 provinces were severely affected by these earthquakes. As of 15 April 2023, they caused close to 51,000 deaths and almost 215,000 completely destroyed/severely damaged buildings. At some locations, the largest horizontal peak ground acceleration (PGA) values of the first and second earthquakes exceeded the code-generated PGAs by almost 3 and 1.75 times, respectively. A technical team visited these areas within 15 h of the first earthquake. The purpose of this article is to present their observations, findings, and the characteristics of the two earthquakes, with comprehensive site survey results supported by photographs. This study concludes that most of the collapsed and severely/moderately damaged buildings in the region were built between 1975 and 2000, when site inspections were rare or non-existent. In addition to the high PGAs recorded in these earthquakes, it was verified that the design and construction of these buildings did not fully comply with the earthquake codes valid at the time. The collapsed buildings and their damage patterns confirm inadequate development length, violation of bending stirrup ends at 135 & DEG;, deficiencies in construction materials and reinforcement configuration, noncompliance with confinement zones, violation of the strong beam-stronger column analogy, and issues related to building inspection. Based on the extent of the damage, it is strongly recommended that the structural performance inspection of all other buildings located near major fault lines, specifically those constructed between 1975 and 2000, should be completed. Since these earthquakes generated much higher PGAs, which is believed to be one of the main reasons for the extensive damage, a re-evaluation of all other PGAs along major fault lines is also recommended.
Citation - WoS: 5
A Light Bulb in Every House the Istanbul General Electric Factory and American Technology Transfer To Turkey
(Johns Hopkins Univ Press, 2022) Tunc, Tanfer Emin; Tunc, Gokhan; Civil Engineering; 06. School Of Engineering; 01. Atılım University
In 1946, Turkish entrepreneur Vehbi Koc signed an agreement with the U.S. firm General Electric to build and operate its first light bulb factory in the Near/Middle East, in Istanbul. This private joint venture introduced new manufacturing techniques, business practices, and consumer habits to Turkey, opening channels of postwar technological exchange. Closer examination of the GE-Koc partnership reveals that during the early Cold War, the transfer and embedding of American technologies in Turkey was a politically complicated process of innovation that required constant adaptation. Fraught with unforeseeable obstacles, it also required cautious negotiation with multiple transnational actors. The story of the GE-Koc partnership thus adds a new dimension to historical understandings of the Turkish Cold War experience and the Americanization of the region. It illustrates how transferring a nonmilitary, soft-power, domestic technologythe light bulb-played a significant role in Turkish-American relations and therefore contributes to studies of U.S. Cold War diplomacy through transnational investment in innovation.
Citation - WoS: 3
Citation - Scopus: 3
A Site Survey of Damaged Rc Buildings in Izmir After the Aegean Sea Earthquake on October 30, 2020
(Croatian Soc Civil Engineers-hsgi, 2023) Mertol, Halit Cenan; Tunc, Gokhan; Akis, Tolga; Civil Engineering; 06. School Of Engineering; 01. Atılım University
An earthquake with a magnitude of Mw = 6.6 and a depth of approximately 16.5 km occurred on 30 October 2020 off the cost of Samos, a Greek island 35 km southwest of Seferihisar, a town in Izmir. The earthquake caused several collapses and severe structural damage in approximately 6,000 buildings, specifically in the Bayrakli District in Izmir Bay. This paper presents the observations and findings of a technical team that visited the earthquake -affected areas immediately after the earthquake. Eleven partially or fully collapsed and several severely damaged reinforced concrete buildings were investigated. Based on the site investigations, we observed that almost all of the collapsed or severely damaged reinforced concrete buildings in the region were built between 1975 and 2000. Site observations also confirmed that the construction of these collapsed or damaged buildings did not conform to the requirements outlined in the Turkish Earthquake Codes used at the time. The failures and severe damage to buildings in earthquake-affected areas are primarily related to inadequate reinforcement configuration, poor material quality, the absence of geotechnical studies, and framing problems related to their lateral load-carrying systems. Therefore, it is recommended that all the buildings located in and around Izmir Bay, particularly those built between 1975 and 2000, be structurally evaluated to prevent any further loss of life and property during future earthquakes.
Structural behavior of shear connectors embedded in different types of concrete
(2020) Wardi, Adil Hadi; Tunc, Gokhan; Ibraheem, Khalil; Civil Engineering; 06. School Of Engineering; 01. Atılım University
Push-out tests are used to determine shear connectors’ properties where two smallreinforced concrete walls are attached to the top and bottom flanges of an I-sectionthrough four shear studs located on both its flanges. In this study, the structural behavior of shear connectors was examined by testing a total of 36 push-out specimens.In these specimens, various test parameters were used. The types of shear connectors and their strengths, their connection types, and the strength of the concrete inwhich they were embedded were all investigated. Headed, L-shaped, and C-shapedstuds were selected in this experimental study to represent different types of shearconnectors. These shear connectors were assumed to be either ordinary or highstrength steel-embedded in three different types of concrete: ordinary, high strength,and reactive powder concretes. In these tests, the shear connectors were connectedthrough welding or epoxy bonding. The objective of this study was to investigate thestructural behaviors of these different types of shear connectors by focusing on theirshear force capacities and slip values. The test results indicate that the reactive powder concrete increased the mechanical properties of concrete as the concrete age increased. The specimens with C-shaped studs made of high-strength steel with weldedstuds embedded in normal weight, high strength and reactive powder concretes, generated the maximum shear resistance values.
Citation - WoS: 2
Wonderland Eurasia: Theme Parks and Neo-Ottoman Identity Politics in Ankara, Turkey
(Univ Newcastle, 2020) Tunc, Tanfer Emin; Tunc, Gokhan; Civil Engineering; 06. School Of Engineering; 01. Atılım University
With an area of 1.3 km(2) or 320 acres, Wonderland Eurasia, which is located in Ankara, Turkey, has been advertised as the largest theme park in Europe and Asia. Almost a decade in the making, it was completed in 2019 at a cost of approximately $250 to $350 million USD (1.5 to 2 billion Turkish Lira) and is seen by supporters as having the potential to boost the sagging tourism industry. This study, which is based on a July 2019 site visit to the theme park, will illustrate, however, that Wonderland Eurasia is much more complicated than appearances suggest. The authors argue that by deploying the imperial glory of the Ottoman Empire, the park constructs an artificial narrative of continuity that connects the past (through Seljuk and even prehistoric themes), to the present, and future (through robotic themes). This is not only meant to symbolically reinforce Turkey's position as a regional 'wonderland'-a social, economic, and cultural powerhouse with grand foreign policy aspirations-but in the process, is also designed to promote a neoliberal Neo-Ottomanism that involves an identity politics of historical elision and selective erasure. Tanfer Emin Tunc is a Professor in the Department of American Culture and Literature at Hacettepe University in Ankara. Gokhan Tunc is an Assistant Professor in the Dept. Of Civil Engineering at the Atilim University in Ankara.