الفهرس 
(chapter(1Only 14 pages are availabe for public view
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Abstract
Space trusses are used for commercial and industrial buildings, auditoriums, airport hangers, dome roofs, canopies and entryways, atrium, liquefied petroleum gas (LPG) bottling plants and many more. Nowadays, the application of composite action has become tremendously used in construction such as space trusses in efficient floor systems in addition to their competitiveness as roof covering structural systems. Additionally, the dynamic analysis is becoming very important since the major forces and stresses in the structural elements are developed by dynamic loads.
The main goal of the current research is studying the nonlinear behavior of composite and non-composite space trusses under seismic loads. The effects of composite action on the dynamic behavior of space trusses, in particular the natural frequencies are presented. The study also is expanded to determine the effect of composite action in changing the space truss lateral displacement response to dynamic excitations in linear and nonlinear time history analysis under earthquake loads. A developed theoretical model by ANSYS software to study linear and nonlinear behavior of non-composite and composite space trusses is presented. This model depends on the finite element method. Three space trusses with different support conditions were designed using Egyptian Code of Practice ECP. The models included one non-composite space truss and two composite space trusses using concrete deck and ferrocement deck. Modal analysis and time history analysis were carried out on these models. Each truss was studied without top slab and with two kinds of concrete top slab; ferrocement and reinforced concrete working compositely with the truss. from their theoretical results, it can be concluded that the composite action improves the dynamic behavior of space trusses and the reduction in the lateral displacement of space trusses with covered ferrocement deck is more than the concrete deck.