الفهرس 
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Abstract
In this thesis cylindrical shell roofs were studied using a six-degree-of-freedom finite element program .. The used program was checked and proved to give good results compared with the available analytical exact solutions, of plates and cylindrical shells . The aim of the study is to obtain the most economic ratios between the different dimensions of the shell .
33 cylindrical shells without edge beams having a constant volume and covering a constant area were solved and the analysis of the results proved that it is preferred to choose the ratio between the rise and the width of shell as large as possible and the ratio between the length and the width as small as possible
27 cylindrical shells with edge beams having a constant =:0l a constant area were also solved and the most economical ratios between the dimensions, were obtained and plotted
Also , the effect of longitudinal ribs was studied .