Browsing by Author "Atimtay E."

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    29 October 2007, Çameli earthquake and structural damages at unreinforced masonry buildings
    (European Geosciences Union, 2008) Kaplan H.; Yilmaz S.; Akyol E.; Sen G.; Tama Y.S.; Cetinkaya N.; Nohutcu H.; Binici H.; Atimtay E.; Sarisin A.
    A recent earthquake of M=4.9 occurred on 29 October 2007 in Çameli, Denizli, which is located in a seismically active region at southwest Anatolia, Turkey. It has caused extensive damages at unreinforced masonry buildings like many other cases observed in Turkey during other previous earthquakes. Most of the damaged structures were non-engineered, seismically deficient, unreinforced masonry buildings. This paper presents a site survey of these damaged buildings. In addition to typical masonry damages, some infrequent, event-specific damages were also observed. Reasons for the relatively wide spread damages considering the magnitude of the event are discussed in the paper.
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    Seismic strengthening of pin-connected precast concrete structures with external shear walls and diaphragms
    (Precast/Prestressed Concrete Institute, 2009) Kaplan H.; Nohutcu H.; Çetinkaya N.; Yilmaz S.; Gönen H.; Atimtay E.
    Pin-connected precast concrete structures are widely used in some European countries of moderate seismicity. However, this structural system is not earthquake resistant because it does not have enough lateral stiffness or lateral-load resistance. Lack of a rigid diaphragm at the roof level imposes severe forces to connections. It is difficult to strengthen such buildings with conventional strengthening techniques because buildings must be unoccupied before retrofitting, which building owners do not like. To overcome this difficulty, employment of external shear walls and a diaphragm at roof level are proposed in this study. A typical pin-connected precast concrete frame and a strengthened structure with the proposed method were tested under imposed, reversed, cyclic drift of constant rate. The experimental study showed that the proposed method increased lateral stiffness, lateral-load resistance, and seismic energy dissipation and provided a diaphragm effect for the structure.
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    A new method for strengthening of precast industrial structures; [Prefabri̇k endüstri̇ yapilarinin güçlendi̇ rmesi̇ i̇çi̇n yeni̇ bi̇r yöntem]
    (2009) Kaplan H.; Yilmaz S.; Çetinkaya N.; Nohutcu H.; Atimtay E.; Gönen H.
    1998 Ceyhan and 1999 Marmara Earthquakes causes extensive damages of the precast industrial structures. This type of structures is important economically. They do not have enough lateral rigidity, lateral load capacity and a rigid diaphragm. Several strengthening techniques have been applied to those type of structures. However, minimization of the disturbance during the strengthening of these structures is an important research issue as considerable economic losses are to be happen while building remains out-of-service. In this study, effectiveness of the strengthening with external shear walls and rigid diaphragm is investigated experimentally. A typical precast concrete frame and a strengthened structure with proposed method are tested under reversed cyclic loads. Experiments showed that proposed method improves lateral stiffness, base shear capacity and provides an efficient diaphragm behavior to the structure.