الفهرس 
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Abstract
In the last few years cable-stayed bridges have gained a lot of importance,
they are widely used for executing medium to large spans of bridges. Due to
the increasing of cable-stayed bridges spans, using of slender-decks became
necessary.
This thesis aims to study the reliability of using an innovative system in the
decking of cable-stayed bridges (composite space trusses). from the structural
and economical points of view. In this thesis, an analytical investigation is
performed to a real bridge (Suez Canal cable-stayed bridge), which its deck is
originally designed as a steel box girder type. Two models for the bridge has
been performed; firstly as a steel box girder deck and secondly as a
composite space truss deck. The two models have been analyzed under
several cases of loading, according to the service loads.
The composite space truss system has been proved a good and reliable
behavior as a decking of cable-stayed bridge. The new system has been
recorded stiffness as high as the steel box girder type under the effect of
traffic loads. There was not a big difference in the own weights of the two
systems especially in the case of using lightweight concrete in the space truss
system. But the composite space truss recorded 27% of the consuming steel
compared by the box girder type. So the composite space truss system could
achieve less cost and construction time than the box girder system.
Also new iterative method for calculating post-tensioning forces of cables is
introduced and verified. For highly indeterminate structures as the cablestayed
bridges, the introduced method could reduce considerablly the
computation time of calculating post-tensioning forces of stay cables