New results in finite element method for stochastic structures
โ Scribed by Y.J Ren; I Elishakoff
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 381 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0045-7949
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โฆ Synopsis
New approaches in the ยฎnite element method for stochastic structures are proposed. The FEM based on exact inverse of stiness matrix is ยฎrst proposed for bar extension problems with stochastic stiness. The method is exempliยฎed by the direct exact inverse of stiness matrix for the deformation of the bar under extension. The second new FEM is based on the diagonalization of the element stiness matrix and the inverse of the global stiness matrix. The method is proposed for beam bending problems with stochastic stiness. The third new FEM is based on the element-level ยฏexibility and its idea is general applicable. The new methods avoid the error due to truncating the expansion series of random stiness matrix, which appears in conventional ยฎnite element methods for stochastic structures based on either series expansion or perturbation technique. Examples of a stochastic bar under tension and stochastic beams under uniform pressure are analyzed. Comparison of the new ยฎnite element solution by new approaches and conventional ยฎnite element solution by the ยฎrst-order perturbation is performed. Numerical results illustrates the superiority of the new proposed methods over the conventional FEM for stochastic structures.
๐ SIMILAR VOLUMES
The conventional finite element method dealing with stochastic problems is based on series expansion of stochastic quantities with respect to basic stochastic deviations, by means of either Taylor expansion, perturbation technique or Neumann expansion. The first-order approximation of the mean respo
This paper proposes a Stochastic Finite Element Method (SFEM) for non-linear elasto-plastic bodies, as a generalization of the SFEM for linear elastic bodies developed by Ghanem and Spanos who applied the Karhunen}Loeve expansion and the polynomial chaos expansion for stochastic material properties