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Strengthening of Steel Slab-On-Girder Bridges by Increasing Torsional Stiffness, Case Study: Karkhe Bridge Original Article, B32 Gharighoran A, Rafizadeh A. Journal. Civil Eng. Urban. 2(5): 182-186. 2012. ABSTRACT:A field investigation is conducted to strengthening of Karkhe Bridge with type of steel slab-girder in Khouzestan, Iran that it was damaged due to unusual loading and had been extra vibration. In the first, two types of truck are assigned that one of them has loading of Iranian code (40-ton-truck), and other has unusual loading (90-ton-truck) that used in field for transportation of materials. In the next step, this bridge is analyzed by finite element method under these two types of loading, and load distribution factors for different modes are determined. According to these factors, flexural and torsional moment and also displacements of bridge are calculated. In order to strengthening of bridge, fin sections are used to increasing the flexural stiffness for girders, and lateral bracings are used to increasing the torsional stiffness. Finally, results of analysis after strengthening of structure are compared with results before strengthening, that it shows improving in distribution of load between girders and decrease of displacements for bridge deck. Keywords:Steel Bridge, Slab-on-girder, Torsional stiffness, Unusual load, Finite element method منبع: [Hidden Content] دانلود: [Hidden Content] JCEU---B 32 182-186.pdf