Author: Hughes, B P
First published: N/A
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Hughes, B P
The purpose of this short paper is to describe in a simple way the operation of the finite element method and to indicate the principles involved. This has been approached by a description of the general processes of structural analysis by the stiffness method using simple matrices when their use is advantageous. The finite element method is presented as an approximation in which a continuum is replaced by a number of discrete elements and an indication is given as to bow the engineer can satisfy himself as to the accuracy of his results. It has not been possible to discuss the suitability of types of elements for particular purposes but details of some of the commonly used elements with appropriate references and comments have been given. Reference has also been made to the use of computers infinite element applications.
O.C. Zienkiewicz, D.M. Brotton and L. Morgan
It seems possible that BS449 is beginning to displace CP110 as a subject for comment to this column. Our old friend Mr. Hairsine writes : I should like to draw members' attention to a recent amendment to BS449 (Amendment No. 5: AMD 1787) which quietly introduces changes affecting the design of bolted connections and web buckling calculations.
A definition of structuralstability is given in terms of the sensitivity of structures to variations of the design parameters. The problem of overall stability is then considered, as distinct from localmember stability, and two main modes of overall instability are identified, namely lateral and torsionalinstability. Each of these modes of overall instability are then examined in terms of some of the main factors involved, particularly the variability of live loads, stiffness and geometry, and the influence of geometrical changes during live loading and differential settlements. Statistical methods have been used where appropriate.
David J. Dowrick