Mixed formulation of nonlinear beam on foundation elements |
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| Authors: | Ashraf Ayoub |
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| Affiliation: | Department of Civil and Environmental Engineering, University of South Florida, Tampa, FL 33620, USA |
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| Abstract: | This paper presents an inelastic element for the analysis of beams on foundations. The element is derived from a two-field mixed formulation with independent approximation of forces and displacements. The state determination algorithm for the implementation of the element in a general purpose nonlinear finite element analysis program is presented and its stability characteristics are discussed. Numerical studies are performed to compare the model with the classical displacement formulation. The studies confirm the superiority of the proposed model in describing the inelastic behavior of beams on foundations. |
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| Keywords: | Beam on foundation Beam on Winkler support Beam on lateral support Mixed formulation Mixed variational principle Mixed finite element |
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