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In this paper, eight noded iso-parametric curved quadratic shell elements are used for Finite Element formulation to analyze continuous bridge deck curved in plan. The computer program developed based on the formulation presented in this study has been used to evaluate the influence of different parameters such as curvature and aspect ratio on the behavior of continuous curved bridges subjected to uniformly distributed load. Though a curved bridge problem is very regular in structural engineering, a detailed and rigorous analysis is often advised since the introduction of curvature brings complexity in structural response. The parametric study carried out in this investigation to establish the defined relationship between the structural behavior of curved bridge deck and straight bridge would prove to be very useful for bridge engineers to readily assess the behavior of continuous bridge curved in plan, based on the responses for a straight bridge deck without compromising on the accuracy.

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freedom, the buckling load Eq. (21) is obtained: (21) N x = D ¯ { ∫ 0 1 ∫ 0 1 [ 1 ϕ 2 ( 1 4 + 3 4 E t E s ) H ∂ 4 H ∂ X 4 + 2 H ∂ 4 H ∂ X 2 ∂ Y 2 + ϕ 2 H ∂ 4 H ∂ Y 4 ] ∂ R ∂ Q } b 2 ∫ 0 1 ∫ 0 1 H ∂ 2 H ∂ X 2     ∂ R ∂ Q where Φ is the aspect ratio. The

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Computational load balancing plays a prominent role on the success of domain decomposition based finite element computations on parallel computers. Computational load balancing is achieved through mesh partitioning. In this paper, a mesh-partitioning algorithm is proposed for generating sub-meshes with optimal shape using a steady state elite preserving evolutionary algorithm (EA). Numerical experiments have been conducted by solving several practical engineering problems. Comparisons have also been made with its multi-level counter part by solving several benchmark problems. Numerical studies indicate that performance of the proposed mesh-partitioning algorithm is either comparable or superior to the multi-level algorithm.

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Abstract

Buckling analysis of axially compressed cylindrical shells having one or two localized initial geometric imperfections was performed by using the finite element method. The imperfections of entering triangular form were assumed to be positioned symmetrically at the mid shell length. The buckling load was assessed in terms of shell aspect ratios, imperfection amplitude and wavelength, and the distance separating the imperfections. The obtained results have shown that amplitude and wavelength have major effects, particularly for short and thin shells. Two interacting imperfections were found to be more severe than a single imperfection, but the distance separating them has small influence.

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Abstract

In this research, buckling behavior of rectangular plates of symmetric and antisymmetric laminated composite having centered circular hole under in-plane static loadings is analyzed with the aid of first shear deformation theory and the finite element method is used to find critical loads. The presence of hole may cause redistribution of stresses in plates with reduction of stability. The aim of the current paper is to find critical buckling load. The loads depend on many parameters like geometric aspect ratios (a/b) and (d/b), plate thickness (t), diameter of the circular hole (d), orientation of ply and boundary conditions. Numerical simulations for various boundary conditions obtained are shown in tables and graphical forms and compared with each other.

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] Ali-Toudert F. , Mayer H. Numerical study on the effects of aspect ratio and orientation of an urban street canyon on outdoor thermal comfort in hot and dry climate , Building and Environment , Vol. 41 , No

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the aspect ratio , Defect and Diffusion Forum , Vols. 312 - 315 , 2011 , pp. 965 – 970 . [5] Hao J. , Wang L. , Shen M. , Li L. , Hu J

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. Numerical study on the effects of aspect ratio and orientation of an urban Street Canyon on outdoor thermal comfort in hot and dry climate , Build Environment , Vol. 41 , 2006 , pp. 94 – 108 . [15

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Pollack Periodica
Authors: Mykola Sysyn, Vitalii Kovalchuk, Ulf Gerber, Olga Nabochenko, and Andriy Pentsak

B. , Martin , U. , Rapp S. Vibration characteristic analysis of ballast with different aspect ratios by means of the discrete element method , Fourth Geo-China International Conference , Shandong, China , 25 - 27 July

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size of 20 mm across the member length as shown in Fig. 2 . The maximum aspect ratio of the elements was equal to 4. Fig. 2. Numerical model used in this study The loads are modeled by applying distributed forces (by means of nodal forces) on the

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