Yazar "Sotelino, Elisa D." seçeneğine göre listele

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    Domain-by-domain algorithm for nonlinear finite-element analysis of structures
    (ASCE-AMER SOC CIVIL ENGINEERS, 2008) Dere, Yunus; Sotelino, Elisa D.
    Parallel and distributed computers have been shown to provide the necessary computational power to solve large-scale engineering problems. However, in order for this computation style to be effectively used, efficient computational algorithms must be devised. In this work, a domain-by-domain algorithm is developed for the parallel solution of nonlinear structural dynamics problems. In the proposed algorithm, the original structure is partitioned into a number of subdomains. Each subdomain is solved independently and, therefore, concurrently using a traditional direct-solution method. Finally, the solution for the interface degrees of freedom between neighboring subdomains is obtained by enforcing compatibility and equilibrium using an iterative procedure. The nonlinear version of the algorithm involves two iterations: The nonlinear dynamic equilibrium iteration and the interface equilibrium and compatibility iteration. The integration of these two iterations is investigated and two strategies are developed. It is found that the strategy in which the two iterations are isolated is the most efficient. As a demonstration, the fully nonlinear transient analysis of a 20-story model building is carried out. Excellent accuracy in the solution and significant speed up values are obtained.
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    Failure Prediction of Skewed Jointed Plain Concrete Pavements Using 3D FE Analysis
    (Pergamon-Elsevier Science Ltd, 2006) Dere, Yunus; Asgari, Alireza; Sotelino, Elisa D.; Archer, Graham C.
    A section of skewed jointed plain concrete pavements (JPCPs) that was constructed in the northern part of Indiana failed with premature transverse cracks. The cracks were observed within 3-4 years of construction. This research was performed to determine if the failure of the skewed JPCPs could have been predicted using a 3D finite element (FE) analysis. A representative 3D FE model was developed and analyzed using three different subgrade materials under traffic and nonlinear thermal loads. The dowel bars and aggregate interlock action were modelled at the skewed joints between adjacent concrete slabs. The effects of linear and nonlinear temperature gradients were compared with regard to the predicted failure of the pavements. The finite element analysis predicted not only the failure of the pavement, but also the correct orientation of the cracks.