الفهرس 
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Abstract
The rapid development of the numerical methods in Structural
Engineering leads not only to the analysis but also to the optimum design of
the structures. Therefore, the main objective of the present research work is
to develop an optimal design model for the minimum weight of orthotropic
Highway deck bridges. The proposed model is developed based on
Sequential Unconstrained Minimization Technique (SUM.T) in the
framework of the Finite Element method.
The proposed model has been exploited to study the sensitivity of the
optimal design of orthotropic bridge versus the variations of thicknesses and
depths of cross-sections. Finally, parametric studies for the effects of layout
spacings, depths of cross and main girders and different types of stiffeners
for different orthotropic deck bridges have been carried out. The optimum
design corresponding to minimum weight is obtained satisfying the
constraints of stresses, deflection and the minimum limits of thicknesses
according to the codes of practice (AASHTO, BS-5400 and E. CP. , 1989).
The live loads are applied according to the modified Egyptian Code of
Practice for loads on structures and bridges (1993).
The model is an efficient and globally convergent mathematical
programming one for the optimal design of orthotropic deck bridges. Many
practical recommendations have been concluded and submitted to the
practitioners for optimal design of minimum weight of orthotropic deck
bridges.
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