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EQUILIBRIUM BASED ITERATIVE SOLUTIONS FOR THE NON‐LINEAR BEAM PROBLEM
Author(s) -
PETRANGELI MARCO,
CIAMPI VINCENZO
Publication year - 1997
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/(sici)1097-0207(19970215)40:3<423::aid-nme72>3.0.co;2-h
Subject(s) - compatibility (geochemistry) , mathematical optimization , linear elasticity , iterative method , stiffness , flexibility method , finite element method , beam (structure) , mathematics , displacement field , flexibility (engineering) , computer science , algorithm , structural engineering , engineering , statistics , chemical engineering
The paper describes a procedure for the non‐linear analysis of structures which are an assemblage of beams with material non‐linearities of general type; the approach uses the equilibrium integrals and a consistent iterative formulation at the element level, within the general framework of the displacement method for the solution of the global structural problem. The application of different approaches to the non‐linear beam problem is presented and discussed including the traditional stiffness and flexibility approach and some mixed formulations. The proposed equilibrium‐based approach is shown to be more accurate and more robust than the traditional compatibility‐based approach, on which most of the non‐linear beam elements available today are based. Similar advantages are also found with respect to an approach based on the three‐field mixed assumed strain method. © 1997 by John Wiley & Sons, Ltd.