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Abstract
The primary objective of this research effort is to present proposals for optimal design and construction of ultra - long span cable stayed bridges due to wind loads. Three dimensional finite element models were performed using advanced specialized Software (SAP 2000 and SOFISTIK), to study the design and stability of these bridges during construction and in the final stage. Cable sag and target force are considered. Moreover, several examples were performed in order to verify the accuracy of the used software. The effect of several parameters are considered: cables arrangement, different pylon shapes, side span length, side span supports, deck cross-section (single cell and double cell), with main span 1500 meters. Since wind loads could have significant effects on ultra - long span cable Stayed Bridges during construction, hence, the thesis focuses on studying different installation and systems to illustrate their effect on these bridges