الفهرس 
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Abstract
In the present thesis an analytical study of the elastic behaviour of corrugated steel shear diaphragms with lightweight concrete fill under in-plane forces is investigated using the fiite element method through out a comperhensive and powerful computer package which was used to solve the large number of equations of the finite element model, to display the nodal displacements and to obtain the distribution of stresses through the different elements of the model.
The complete diaphragm is simulated in thefinite element model by an equivalent orthotropic plate elements. The derivation of the elastic properties of these equivalent orthotropic plate element is given.
Aparametric study on te behaviour of the composite diaphragm under different conditions of fastening, and different geometrical and structural parameters is presented.
The effect of using such composite diaphragms as roofs on the structural behaviour and on the internal forces of rectangular steel structures is also presented. A comparison between the use of composite decks and the use of pure steel diaphragms (without lightweight concrete fill) as roofs of these structures is investigated.