Attention is focused on the effective length of compression members in double-layer grids. An attempt to account for the end fixity resulting from various types of employed jointing systems and the effect of other members meeting at the same joint is made. A theoretical model for calculating the effective length is presented and is applied to a wide-range of cases. The goal is to suggest using this model for assessing the effective length of compression members in double-layer grids and to make recommendations for various effective length factors for a wide range of practical cases which would then increase the efficiency of designs that are presently based on conservative estimates.
A parametric study of the various factors affecting the design of double layer space frame grids is presented. This parametric study was conducted with the help of example structures and covered the support arrangement, the grid depth, the grid module and the grid layouts. The intent is to give the designer an idea about the effects of the choice of any of these parameters on the grid's behaviour and design requirements. This information should serve as a means for developing successful preliminary designs and as such reduce the need for many trials before the design is finalised.
Page No. Line No. Error. Correction 138 18 Comparison Compression 150 15 elasti-rigid elastic-rigid 167 1 Method Methods 167 15 technique techniques 172 36 AZVELANI ZEVELANI UNIVERSITY OF LONDON IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY THE ELASTOPLASTIC ANALYSIS OF PIN-JOINTED SPATIAL STRUCTURES by Usama Rustom Madi A thesis submitted for the degree of Doctor of Philosophy in the Faculty of Engineering of the
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