Yazar "Halifeoglu, F. Meral" seçeneğine göre listele

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    ARCHITECTURAL AND HYDROLOGICAL FEATURES OF THE HISTORICAL BASALT BRIDGES IN DIYARBAKIR-TURKEY
    (Stef92 Technology Ltd, 2016) Halifeoglu, F. Meral; Toprak, Z. Fuat; Kavak, Orhan
    Historical structures reflect the cultures, religions, language, and civilization and development levels of people lived in the past. In brief, each historical structure can be qualified as evidence of the life of the people built them. Furthermore, such structures give information about the early age nature of the region (i.e. hydrological, meteorological, geological characters of the region their built). Therefore protecting such historical structures and the recording the information about them are essentially important. With the respect of above mentioned consideration in this study, the historical bridges located (built) in Diyarbakir province have been first mapped. Then, they have been architecturally, hydrological, and geologically interpreted. In another word, the features, the structural materials, and streams of the bridges are architecturally, geologically, and hydrologically examined respectively.
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    RESTORATION OF HISTORICAL KURT BRIDGE (MIHRAPLI BRIDGE, VEZIRKOPRU) DESIGN AND APPLICATION STUDIES
    (Middle East Technical Univ, 2013) Halifeoglu, F. Meral; Sert, Halide; Yilmaz, Suheyla
    Apart from the construction of the new roads and bridges, it is one of the principal duties of the General Directorate of Highways to repair and maintain the historical bridges in accordance with the projects to be produced or caused to be produced by the General Directorate of Highways. Pursuant to the inventory records of historical bridges (kept until December 2012), it has been observed that there exist a total of 1646 each bridges in our country which is located on First Degree Seismic Zone, dating back to Hittite (1), Urartian (1), Roman (128), East Roman (22), Seljuk (150), Ottoman (1280) and Early Republican (64) Periods with 307 bridges abroad the majority of which is located in Bosnia and Herzegovina. The said 1646 bridges are grouped in view of the material used in construction in the following manner: Stone (1568) (with 21 each Stone-Brick Mix), Wooden (24), Iron (29), Reinforced Concrete (25). Anatolia which has witnessed the development of various civilizations for centuries was covered with road network to meet the social, communicational, militaristic and commercial requirements of the societies. Within this process, as part of the transportation system the bridges have turned out to be the supplementary elements of the cultural history as beneficial structures serving for commercial, economic, militaristic, social and cultural purposes. The restoration projects, application studies and technical researches carried out on Historical Kurt Bridge which is considered to be one of the significant bridge architecture examples and located on Istavloz (Istavroz) Stream in Vezirkopru District in Samsun Province in 2007 through 2009 will be discussed. It is considered that this particular study which puts an emphasis on the fact that all scientific and technologic approaches which may help restoration and survival of the historical bridges which are of great importance in view of both culture and technology history, are applicable and that the experiences obtained are shared will be beneficial for the restoration works which should be executed through the contributions to be made by the different occupational groups and disciplines.
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    Öğe
    Vertical strong ground motion effects on seismic damage propagations of historical masonry rectangular minarets
    (Pergamon-Elsevier Science Ltd, 2018) Bayraktar, Alemdar; Hokelekli, Emin; Halifeoglu, F. Meral; Mosallam, Ayman; Karadeniz, Halil
    Masonry towers and minarets are slender tall structures and highly vulnerable to strong ground motions due to their structural and material characteristics. The paper aims to investigate the effect of vertical ground motion on damage propagations of historical masonry slender tall rectangular stone minarets numerically. The Ulu Mosque minaret with height of 42.90 m constructed in 639 in Diyarbakir, Turkey, is selected as an application. Firstly, three dimensional solid and continuum finite element models of the minaret are obtained from the surveys. Since the foundation of the minaret is sitted on the hard soil, soil-structure interaction is not considered in the finite element model. The finite element model of the minaret is updated by modal analyses results and an empirical frequency formulation developed using the measurement results. Mechanical material properties of the masonry unit are determined using the properties of the stone and mortar used in the minaret. Concrete damaged plasticity (CDP) material model adjusted to masonry structures is considered in the nonlinear analyses. The acceleration records of horizontal (N-S) and vertical (V) components of May 1, 2003 Bingol earthquake (Mw = 6.4), which was recorded in hard soil and occurred in the near region of Diyarbakir city, are chosen as a strong ground motion. Then, linear time history and nonlinear step by step seismic analyses of the minaret are implemented for only horizontal, and combined horizontal and vertical components of the earthquake. The time histories of displacements, minimum and maximum principal strains and stresses, and damage propagations on the minaret are compared for only horizontal, and combined horizontal and vertical load cases including self-weight. It can be stated that consideration of vertical ground motion component in combination with horizontal component affects damage percentages and propagations on slender tall rectangular stone minarets.