Yazar "Yuksel, S. B." seçeneğine göre listele

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    Behaviour of coupling beams having vertical slits at the ends
    (WIT PRESS/COMPUTATIONAL MECHANICS PUBLICATIONS, 2007) Yuksel, S. B.
    Architectural considerations and functional use result in door openings on the shear walls of tunnel form buildings, which cause coupled shear walls to be connected by short, deep and thin coupling beams. These coupling beams are subjected to higher shear forces and their thickness becomes generally less than 250mm for the tunnel form buildings, and much less than their counterparts in conventional reinforced concrete structures. It is simply not possible to design practically constructible coupling beams in the tunnel form buildings. In a coupled shear wall system, shear forces acting on the coupling beams can be reduced simply by the application of vertical separation joints (slits) at the ends of the coupling beams. As a design alternative, the use of slit connections at the ends of the coupling beams to be able to decrease the shear stiffness and shear forces was analytically investigated. Shear stiffness terms of common slit connected coupling beams (SCCBs) were derived by using plane stress finite elements. To be specific, extensive parametric study with respect to the geometry of a SCCB was carried out. Coupling beam heights, coupling beam lengths, slit heights and slit lengths were varied in an extensive parametric study to demonstrate their influences on the shear stiffness terms.
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    Failure mechanism of shear-wall dominant multi-story buildings
    (WIT PRESS/COMPUTATIONAL MECHANICS PUBLICATIONS, 2008) Yuksel, S. B.; Kalkan, E.
    The recent trend in the building industry of Turkey as well as in many European countries is towards utilizing the tunnel form (shear-wall dominant) construction system for development of multi-story residential units. The tunnel form buildings diverge from other conventional reinforced concrete (RC) buildings due to the lack of beams and columns in their structural integrity. The vertical load-carrying members of these buildings are the structural-walls only, and the floor system is a flat plate. Besides the constructive advantages, tunnel form buildings provide superior seismic performance compared to conventional RC frame and dual systems as observed during the recent devastating earthquakes in Turkey (1999 M-w 7.4 Kocaeli, M-w 7.2 Duzce, and 2004 M-w 6.5 Bingol). With its proven earthquake performance, the tunnel form system is becoming the primary construction technique in many seismically active regions. In this study, a series of nonlinear analyses were conducted using finite element (FE) models to augment our understanding on their failure mechanism under lateral forces. In order to represent the nonlinear behavior adequately, The FE models were verified with the results of experimental studies performed on three dimensional (M) scaled tunnel form building specimens. The results of this study indicate that the structural walls of tunnel form buildings may exhibit brittle flexural failure under lateral loading, if they are not properly reinforced. The global tension/compression couple triggers this failure mechanism by creating pure axial tension in the outermost shear-walls.
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    Investigation of the behaviour of single span reinforced concrete historic bridges by using the finite element method
    (WIT PRESS, 2009) Yuksel, S. B.
    Single span reinforced concrete (RC) historic bridges have been commonly constructed with symmetric parabolic haunches. Due to their non-prismatic geometrical configuration, their assessment, particularly the computation of fixed-end forces (FEFs) and fixed-end moments (FEMs), becomes a complex problem. Therefore, the aim of this study is to investigate the modelling, analysis and behaviour of such bridges with the aid of finite element (FE) modelling. FEFs and FEMs due to uniformly distributed loads and point loads, as well as vertical deflections, were computed through a comprehensive parametric study. Design formulas and dimensionless design coefficients were proposed based on a comprehensive parametric study using FE models.