Yazar "Kamanh, M." seçeneğine göre listele

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    An experimental study on the seismic performance improvement of nonductile reinforced concrete structures with external shearwall application
    (CRC PRESS-TAYLOR & FRANCIS GROUP, 2015) Bahadir, F.; Balik, F. S.; Korkmaz, H. H.; Kamanh, M.; Unal, A.
    Turkey lies over one of the most active seismic zones in the world. Several destructive earthquakes resulted in high dead losses in the last century. This shows that the residental buildings with poor earthquake resistance must be rehabilitated with rapid, economical, feasible, functional and effective strengthening methods. In this study, six reinforced concrete frames with one bay-two storeys and in 1/3 scale were tested. The specimens contained several deficiencies that were commonly observed in residential buildings in Turkey. The applied lateral loading was reversed cyclic loading that simulates the earthquake exicitions. First specimen was the reference specimen and didn't contain any strengthening. The other specimens were strengthened with external RC shear walls with or without window openings. The size and position of the openings are parameters in the study. Columns of the frames also jacketed with reinforced concrete. The hysteresis curves and envelope curves were presented within the paper. In the conclusion, the capacity increase of the frame was discussed and several recommendations were presented. Test results showed that external shear walls significantly improved the lateral load carrying capacity, stiffuess and energy dissipation capacity of the bare frame.
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    Punching shear strength of flat slabs with different punching reinforcement configurations
    (CRC PRESS-TAYLOR & FRANCIS GROUP, 2015) Kamanh, M.; Ezer, I.; Korkmaz, H. H.
    In this study, an experimental investigation on the punching shear strength and behavior of flat plates is performed. The use of flat plate is popular for medium rise buildings especially for hotels, shopping centers and office buildings. The plate-column connections are the most critical parts. The brittle and sudden type of failure, called punching, is very dangerous and special attention must be paid to prevent this type of failure. In Turkish Reinforced Concrete Code the use of punching reinforcement is advised and it is stated that the capacity of the connection must be determined by experimental studies. The results of a test series on the punching behavior of slabs with different punching reinforcements are presented. Totally four specimens representing an interior column-slab connection was modeled and tested. Specimens were provided different shear reinforcement arrangements except for the specimen SRO which is a reference specimen and tested to see the reference behavior and capacity. The other four specimens include different punching reinforcement configurations. The plate concrete was in the normal strength concrete range. The load was applied to the column stub concentrically and flexural reinforcement ratios were kept constant for all specimens. The loaddisplacement curves as well as the load-rotation curves were presented in this study. Also Turkish Reinforced Concrete Code capacity predictions were compared with the test results.
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    Seismic performance improvement of infilled nonductile RC frames
    (CRC PRESS-TAYLOR & FRANCIS GROUP, 2015) Korkmaz, S. Z.; Kilic, A.; Korkmaz, H. H.; Kamanh, M.
    The objective of this paper is to report the result of an experimental program conducted on the strengthening of nonductile RC frames by using external mesh reinforcement and plaster application. This type of strengthening technique is recently added to the new Turkish Earthquake Code (2007). The main objective was to test an alternative strengthening technique for reinforced concrete buildings, which could be applied with minimum disturbance to the occupants. Generic specimen is two floors and one bay RC frame in Y, scales. The basic aim of tested strengthening techniques is to upgrade strength, ductility and stiffness of the member and/ or the structural system. Six specimens, two of which were reference specimens and the remaining four of which four of which had deficient steel detailing and poor concrete quality were strengthened and tested in an experimental program under cyclic loading. The parameters of the experimental study are mesh reinforcement ratio and plaster thickness of the infilled wall. The results of test on these frames were compared with reference specimens. The effects of the mesh reinforced plaster application for strengthening on behavior, strength, stiffness, failure mode and ductility of the specimens were investigated. Premature and unexpected failure mode has been observed at first and second specimens failed due to inadequate plaster thickness. Also third strengthened specimen failed due to inadequate lap splice of the external mesh reinforcement. The last modified specimen behaved satisfactorily with higher ultimate load carrying capacity. Externally reinforced infill wall composites improve seismic behavior by increasing lateral strength, lateral stiffness, and energy dissipation capacity of reinforced concrete buildings, and limit both structural and nonstructural damages caused by earthquakes.