الفهرس 
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Abstract
In the recent decades, due to the mankind progress and civilization, the need to build long span structures and cover large areas increased. Such need enforced structural engineers to create new structural systems depending on the usage of modern high tensile structural steel and cables. Such structures (Cable supported structures) utilize efficiently the structural materials besides they have nice appearance.
from the historical point of view, cable supported structures have been rapidly developed since the Second World War and became one of the competitive structural systems for long span roofs and bridges. Examples of these are cable stayed bridges, cable suspension bridges, cable suspended roofs, and guyed towers. Such structures gained much popularity and became one of the important landmarks allover the world. Due to the importance of these structures from the economic point of view, great care should be taken when analyzing and designing such structures.
This thesis deals with the stability analysis of space structures supported with cables such as cable stayed bridges, cable roofs and guyed towers. The study is made taking into consideration the effect of different types of nonlinearities. The nonlinearities considered here are those due to Semi-Rigid connections, spread of plasticity, and nonlinear behavior of cables in addition to both of material and geometrical nonlinearities.
The current research demonstrates the nonlinear static behavior of simple structures and more complicated ones and compares their behavior with the results of pioneer researchers like Salem (1970), Saafan (1970), and Chen and Tomas (1994). The analysis is made using the popular finite element based programs (SAP2000N) and (Section Builder Version 8.00). The programs have great features that enable the user to choose the best way for modeling the structure considering different nonlinearities, such as (moment-rotation) or (load- displacement) relationships, P-delta with large displacement and the option of tension or compression only. The programs give the equivalent results when considering the effects of all the pre-mentioned nonlinear parameters, in a single step analysis.
The current analysis has the capability of monitoring the structure behavior step by step from first loading until failure with nonlinear behavior. Such process enables the prediction of the scenario of failure of any structure step by step.