Yazar "Yilmaz, Ulku S." seçeneğine göre listele

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    Experimental and Analytical Analysis of RC Frames Strengthened Using RC External Shear Walls
    (SPRINGER HEIDELBERG, 2011) Kaltakci, M. Yasar; Arslan, M. Hakan; Yilmaz, Ulku S.
    In this study, we have investigated the application of an external RC shear wall as a method of improving the performance of reinforced concrete (RC) frames in an earthquake. We produced a series of eight RC frames, each of which was modeled at a 1/3 scale with two floors and two spans. These frames were of the same size and had design and construction deficiencies commonly encountered in the RC buildings in Turkey. We tested four of the eight frames without any strengthening, under reversed cyclic lateral loadings resembling earthquake loads. The remaining four frames we tested under the same conditions after strengthening them with RC external shear walls. We arranged the axial force loads applied to the columns of the test models in two different ways to result in tensile and compression failure. The test results were analyzed on the basis of a comparison using static push over analysis. The results of the experimental tests and analytical studies showed that the RC external shear wall improved the seismic character of the existing RC frame as much as RC infill walls, therefore this method can be used as an alternative strengthening method. Also, the method provides effective, practical and economical strengthening that minimizes the need for additional works and does not restrict the use of the RC building.
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    A new approach on the strengthening of primary school buildings in Turkey: An application of external shear wall
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) Kaltakci, M. Yasar; Arslan, M. Hakan; Yilmaz, Ulku S.; Arslan, H. Derya
    Considerable life and property losses have occurred because of the devastation due to the earthquakes happened in Turkey during the last 10 years. Especially, the damages that occurred on the public buildings were more serious and irrevocable when compared with the damages that took place oil private buildings. In Turkey, primary school buildings constitute a large portion of the public buildings. Unfortunately, these buildings faced with heavy damages during the last earthquakes. The strengthening of existing primary school buildings in accordance with new contract specifications, thereby reducing losses of life and property to a minimum in case of an earthquake, has become one of the important issues on the agenda of the Turkish government. However, the strengthening of the primary school buildings by using the available methods is so difficult, because the strengthening works take a long time, the user of these buildings are obliged to evacuate the buildings and also there occurs extra costs caused by the additional repairs and renovations within the buildings when these methods are used. In this study, a new strengthening type of reinforced concrete buildings namely "external reinforced concrete shear wall" application method is discussed. For this purpose, three typical projects, which have been built commonly, are mentioned. The structural deficiencies observed in these buildings are given. In the experimental stage of this study, all experimental programme is formed in order to evaluate the performance of the external shear wall application. In the experimental schedule, four reinforced concrete test specimens are produced by using the design and detailing data of the considered school buildings. According to these tests, the strengthening and system improvement performed through adding external reinforced concrete shear wall to the reinforced concrete buildings will add improved behaviour, strength and rigidity to the system with its low cost besides the ease of construction and application. Since these buildings are detached and located in a multi-purpose garden, constructed as typical projects and have special architectural layout, developing this method for the existing primary school buildings will be able to be implemented in most of the primary school buildings Without my problems. (C) 2007 Elsevier Ltd. All rights reserved.