DEVELOPMENT OF ADVANCED STOCHASTIC FINITE ELEMENT METHODS FOR THE ANALYSIS OF UNCERTAIN STRUCTURES

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Authors
  1. Orisamolu, I.R.
  2. Liu, O.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
A research and development study regarding the formulation and implemmentation of advanced stochastic finite element methods (SFEM) for probabilistic response characterization as well as reliability assessment of uncertain structures is presented. The capabilities and features of a stochastic finite element analysis (SFEA) computer program - stochastic vibration and strength (STOVAST) developed by the authors in an earlier study are significantly enhanced. Enhancements include the expansion of teh stochastic finite element library, provision of new limit states (including natural frequency and bifurcation buckling eigenvalues), the modelling of stochastic structural geometry and new approximate probability modelling and integration algorithms such as the sequential quadratic programming (SQP) algorithm. New response-surface-based fast probability integration algorithms are developed. These include the advanced mean value (AMV) class of algorithms as well as a new FORM- based adaptive response surface algorithm (FARESA). The latter algorithm which was formulated and implemented in this work is shown to be robust, computationally efficient, and accurate in all regions of teh cumulative distribution function curve. Also, results of important research investigations pertaining to methodologies for enhancing teh computational efficiency of SFEA for large scale structures are presented. TRUNCATED
Keywords
Stochastic Finite Element Methods (SFEM;Computer program (STOFLD);Computer programs (RANFLD)
Report Number
DREA-CR-96-407 — Contractor Report
Date of publication
01 Feb 1996
Number of Pages
100
DSTKIM No
96-02779
CANDIS No
499395
Format(s):
Document Image stored on Optical Disk;Hardcopy

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