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The effect of concrete slab-rockfill interface behavior on the earthquake performance of a CFR dam

Bayraktar, Alemdar | Kartal, Murat Emre | Adanur, Suleyman

Article | 2011 | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS46 ( 1 ) , pp.35 - 46

Earthquake response of the concrete slab is mostly depended upon its conjunction with rockfill This study aims to reveal the effect of concrete slab-rockfill interface behavior on the earthquake performance of a concrete-faced rockfill dam considering friction contact and welded contact Friction contact is provided by using interface elements with flue numbers of shear stiffness values 2D finite element model of Torul concrete-faced rockfill dam is used for this purpose Linear and materially non-linear time-history analyses considering dam-reservoir interaction are performed using ANSYS Reservoir water is modeled using fluid finite . . .elements by the Lagrangian approach The Drucker-Prager model is preferred for concrete slab and rockfill in non-linear analyses Horizontal component of 1992 Erzincan earthquake with peak ground acceleration of 0 515g is used in analyses The maximum and minimum displacements and principal stresses are shown by the height of the concrete slab and earthquake performance of the dam is investigated considering different joint conditions for empty and full reservoir cases In addition potential damage situations of concrete slab are evaluated (C) 2010 Elsevier Ltd All rights reserve Daha fazlası Daha az

Linear and nonlinear response of concrete slab on CFR dam during earthquake

Bayraktar A. | Kartal M.E.

Article | 2010 | Soil Dynamics and Earthquake Engineering30 ( 10 ) , pp.990 - 1003

The joint between concrete slab and rockfill is designed as welded contact in the classical modeling of concrete-faced rockfill (CFR) dams and earthquake response of the CFR dams is determined by this method. In this study, linear and nonlinear response of Torul CFR Dam including interface element between concrete slab and rockfill were investigated for the duration of strong seismic excitation. The finite element analyses were performed by employing both cases, empty and full reservoir, to research the effect of the reservoir water on the earthquake response of the dam. The reservoir water was modeled with fluid finite elements by . . .the Lagrangian approach. The Drucker-Prager model was used in nonlinear analyses for concrete slab, rockfill and soil materials. According to finite element analyses, displacement and stress components were increased by hydrodynamic pressure. The nonlinear response of the concrete slab was monitored about the peak ground acceleration (pga). This study reveals that the size of sliding zone increases with increasing acceleration amplitudes. © 2010 Elsevier Ltd Daha fazlası Daha az

Comparison of near- and far-fault ground motion effect on the nonlinear response of dam-reservoir-foundation systems

Bayraktar A. | Altunişik A.C. | Sevim B. | Kartal M.E. | Türker T. | Bilici Y.

Article | 2009 | Nonlinear Dynamics58 ( 4 ) , pp.655 - 673

In this paper, it is aimed to compare the near- and far-fault ground motion effects on the nonlinear dynamic response of dams including dam-reservoir-foundation interaction. Two different types of dams, which are concrete arch and concrete faced rockfill dams, are selected to investigate the near- and far-fault ground motion effects on the dam responses. The behavior of reservoir water is taken into account using Lagrangian approach. The Drucker-Prager material model is employed in nonlinear analyses. Near and far-fault strong ground motion records, which have approximately identical peak ground accelerations, of Loma Prieta (1989) . . .earthquake are selected for the analyses. Displacements, maximum and minimum principal stresses are determined using the finite element method. The displacements and principal stresses obtained from the analyses of dams subjected to each fault effect are compared with each other. It is clearly seen that there is more seismic demand on displacements and stresses when the dam is subjected to near-fault ground motion. © 2009 Springer Science+Business Media B.V Daha fazlası Daha az

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