Browsing by Author "Küçükarslan S."
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Item Nonlinear pile-soil-structure interaction under transient impact loading(2002) Küçükarslan S.; Banerjee P.K.Nonlinear pile-soil-structure interaction is formulated by using finite element and boundary element methods. Thus, the main idea in using this technique is to get computationally efficient results when comparing with 3D boundary element elastodynamic formulations. Linear beam column finite elements are used to model the piles and structural elements. Numerical modeling of soil media is done by introducing a rational approximation to continuum with nonlinear interface springs along the piles. By using this mixed type of formulation, it is possible to get computationally most efficient and accurate results.Item Time domain dynamic analysis of piles under impact loading(Elsevier BV, 2002) Küçükarslan S.In this paper, time domain dynamic analysis of piles under impact loading is presented. For this purpose a hybrid boundary element technique is implemented. Linear beam column finite elements are used to model the piles and resulting governing equations are solved using an implicit integration scheme. The continuum is assumed to be elastic and an efficient step-by-step time integration scheme is implemented by using an approximate half space integral formulation. By enforcing displacement equilibrium conditions at each time step, a system of equations is generated which yields the solution. Results of this time domain formulation under linear material behavior are compared with Laplace domain results to validate the methods. © 2002 Elsevier Science Ltd. All rights reserved.Item Inelastic analysis of pile soil structure interaction(Elsevier BV, 2003) Küçükarslan S.; Banerjee P.K.; Bildik N.In this paper, inelastic pile soil structure interaction is analyzed by using a hybrid type of numerical method. Piles and structural elements are modeled as linear finite elements and soil half space is modeled by using boundary elements. Inelastic modeling of soil media is presented by introducing a rational approximation to continuum with nonlinear interface springs along the piles. For this purpose, modified Özdemir's nonlinear model is implemented and systems of equations are coupled for piles and pile groups at interacting nodes. To verify the proposed algorithm, four experimental results from previously conducted tests under static loads are compared with those obtained from present analysis. © 2003 Elsevier Science Ltd. All rights reserved.Item Behavior of axially loaded pile group under lateral cyclic loading(Elsevier BV, 2003) Küçükarslan S.; Banerjee P.K.In this paper, a hybrid boundary element technique is implemented to analyze behavior of axially loaded pile group under lateral cycling loading. Nonlinear material behavior of soil is introduced by a rational approximation to continuum with nonlinear interface springs along the piles. Linear beam column finite elements are used to model the piles. By enforcing displacement and equilibrium conditions at each increment, a system of equations is generated which yields the solution. A numerical study to verify the proposed model is performed. To investigate the cyclic behavior three groups are loaded (1×2, 2×3, and 3×3 groups) initially half of the ultimate axial load, then a lateral loading is applied for cyclic behavior of piles, is done to investigate the behavior of pile groups. © 2002 Elsevier Science Ltd. All rights reserved.Item Inelastic analysis of pile-soil interaction(2004) Küçükarslan S.; Banerjee P.K.In this paper, inelastic pile-soil interaction is analyzed by using a hybrid type of numerical method. Piles are modeled as linear finite elements and the soil half-space is modeled using boundary elements. Inelastic modeling of the soil media is introduced by a rational approximation to a continuum with nonlinear interface springs along the piles. For this purpose, a modified Özdemir's nonlinear model is implemented and systems of equations are coupled for piles and pile groups at interacting nodes. To verify the proposed algorithm, three experimental results from previously conducted tests on piles under static axial and lateral loads are compared with those obtained from the present analysis. © ASCE.Item Dynamic analysis of dam-reservoir-foundation interaction in time domain(Springer Verlag, 2004) Küçükarslan S.In this paper, a time domain dynamic analysis of the dam-reservoir- foundation interaction problem is developed by coupling the dual reciprocity boundary element method (DRBEM) for the infinite reservoir and foundation domain and the finite element method for the finite dam domain. An efficient coupling procedure is formulated by using the substructuring method. Sharan's boundary condition at the far end of the infinite fluid domain is implemented. To verify the proposed scheme, numerical examples are carried out and compared with available exact solutions and finite-finite element coupling results for the problem of the dam-reservoir interaction. Finally, a complete dam-reservoir-foundation interaction problem is solved and its solution is compared with previously published results.Item Time domain dynamic analysis of dam-reservoir-foundation interaction including the reservoir bottom absorption(2004) Küçükarslan S.In this paper, time-domain dynamic analysis of dam-reservoir foundation interaction is presented by coupling the dual reciprocity boundary element method (DRBEM) in the infinite reservoir and foundation domain and the finite element method in the finite dam domain. An efficeint coupling procedure is formulated by using the sub-structuring method. The effects of the reservoir bottom absorption are included in the formulations. Sharan's boundary condition for the far-end of the infinite fluid domain is implemented. To verify the proposed scheme, numerical examples are carried out by comparing with the available exact solutions and finite finite element coupling results for the dam reservoir interaction. A complete dam reservoir-foundation interaction is also studied by including the bottom absorption effects. © 2004 John Wiley and Sons, Ltd.Item Transient dynamic analysis of dam-reservoir interaction by coupling DRBEM and FEM(2004) Küçükarslan S.; Coşkun S.B.In this paper, time domain dynamic analysis of dam-reservoir interaction is presented by coupling the dual reciprocity boundary element method in the infinite fluid domain and the finite element method in the solid domain. An efficient coupling procedure is formulated by using sub-structuring method. Sammerfeld's boundary condition for far end of the infinite domain is implemented. To verify the proposed scheme, numerical examples are carried out to compare with the available exact solutions and results of the finite-finite element coupling.Item Transient analysis of dam-reservoir interaction including the reservoir bottom effects(2005) Küçükarslan S.; Coşkun S.B.; Taşkin B.In this paper, time-domain transient analysis of elastic dam-reservoir interaction including the reservoir bottom effects is presented by coupling the finite element method in the infinite fluid domain and in the solid domain. An efficient coupling procedure is formulated by a substructuring method. Sommerfeld's boundary condition for the far end of the infinite domain is implemented. To verify the proposed scheme, numerical examples are given to compare with available exact solutions for rigid and elastic dam cases. Finally, a numerical example is studied to evaluate the effects of the reservoir bottom. © 2005 Elsevier Ltd. All rights reserved.Item An exact truncation boundary condition for incompressible-unbounded infinite fluid domains(2005) Küçükarslan S.In this paper, dam-reservoir interaction for a vibrating structure in an unbounded and incompressible and inviscid fluid is analyzed by using finite element approach. An exact boundary condition is developed for truncating surface of unbounded fluid domain. In the derivation of boundary condition, it is assumed that vibration of dam is in the normal direction of dam-reservoir interface and this interface is vertical. Moreover, bottom of fluid is rigid and horizontal. The derived boundary condition is implemented in the finite element code and results are compared with by using Sommerfeld's and Sharan's boundary conditions. It is seen that the proposed boundary condition is efficient and gives better results than the previous published results. © 2004 Elsevier Inc. All rights reserved.Item Solution of different type of the partial differential equation by differential transform method and Adomian's decomposition method(2006) Bildik N.; Konuralp A.; Bek F.O.; Küçükarslan S.In this paper, the definitions and operations of the differential transform method [J.K. Zhou, Differential Transformation and Its Applications for Electrical Circuits, Huarjung University Press, Wuuhahn, China, 1986] and Adomian's decomposition method which is given by George Adomian for approximate solution of linear and non-linear differential equations are expressed [G. Adomian, Convergent series solution of nonlinear equation, Comput. Appl. Math. 11 (1984) 113-117]. Different partial differential equations are solved under the view of these methods and compared with the approximate solution and analytic solution. At the end, these solutions are illustrated by tables and figures. © 2005 Elsevier Inc. All rights reserved.Item Correction of node mapping distortions using universal serendipity elements in dynamical problems(Techno-Press, 2011) Küçükarslan S.; Demir A.In this paper, the use of universal serendipity elements (USE) to eliminate node mapping distortions for dynamic problem is presented. Rectangular shaped elements for USE are being introduced by using a flexible master element with an adjustable edge node location. The shape functions of the universal serendipity formulation are used to derive the mass and damping matrices for the dynamic analyses. These matrices eliminate the node mapping distortion errors that occurs incase of the standard shape function formulations. The verification of new formulation will be tested and the errors encountered in the standard formulation will be studied for a dynamically loaded deep cantilever.