الفهرس 
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Abstract
Box girder configuration hc.s played n.n important role in structural applications for many years. The modern bridge structures, frequently, take the form of thin-walled box section with vertical axis of symmetry. The high torsional rigidity of this closed section make it suitable for highway bridges of medium and large spans~Transversally, non-uniform loading on box girder produces considerable stresses associated with warping and distorsion of cross section in addition to the conventional flexural stresses. The longitudincl stre¬sses caused by warping and distorsion of cross sectio~ are Greatly influenced by intermediate diaphragms. The conventional methods used for structural analysis could not describe the behaviour of box girder with inter¬mediate diaphragms with an accmacy adequate for design.The finite element method for the structural an.a,¬lysis is considered one of the’relatively accurate methods for the analysis of such structures. In this method, all factors affect the behaviour of box girder such as end ~ondi tions t types of loading and intermed¬ia:te diaphragms can be considered.