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    Size effect tests of different notch depth specimens with support rotation measurements
    (Pergamon-Elsevier Science Ltd, 2016) Caglar, Yasin; Sener, Siddik
    Test results from a Type I & II size effect experimental study on notched and un-notched beams are presented in this paper. The test specimens were geometrically similar but had different scale ratios and different notch length ratios of 0, 0.02, 0.075, 0.15 and 0.3. The specimens had rectangular cross sections with constant thickness of 40 mm and the depth varied from 40 mm to 500 mm corresponding to a scale ratio of 1:12.5. Rotations measured at support locations for each specimen are presented to reinforce the experimental findings. It was observed that all specimens with different notch-to-length ratios exhibited size effect, in which the stress at maximum load (failure load divided by cross-sectional area) decreased as the size was increased. The results indicate that the failure is governed by fracture mechanics principles. This phenomenon is not addressed in current design codes, which do not account for such size effect. The test results showed that beams with shallow notch exhibit Type I, beams with deep notch exhibit Type II size effect law. The test results compared favorably with several widely accepted size effect models. (C) 2016 Elsevier Ltd. All rights reserved.
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    Vertical Displacements of Komurhan Bridge
    (Turkish Chamber Civil Engineers, 2016) Sener, Siddik; Caglar, Yasin
    In this study, displacements and stress distribution under vertical loads of Komurhan Bridge that is built by balanced cantilever method for the first time in Turkey were determined. For this purpose ANSYS software is used and the real behaviour of the bridge is created with the finite elements model by taking into account the material properties and the boundary conditions. The main span of the Komurhan Bridge is 143.50m, symmetric with prestressed box section whose end supports are located on the shore. The displacements obtained by the finite elements model of the bridge and those measured at the cantilever end under the truck load are found to be very close. The displacements, normal and shear stresses were obtained for the model which represents the real behavior of the bridge under excessive loadings. Excessive displacements, normal and shear stress at the critical cross sections are important for the safety of the bridge.