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A study is carried out to evaluate the stresses for steel box girder support diaphragm using finite elements method. This study includes the stress characteristic compared with experimental method for diaphragm design. The results from the finite elements method are compare with the results from experimental investigations and shown to give good agreement. The shear stresses wre generally uniformed in the outer plane. increased rapidly above the bearing. The horizontal direct stresses were generally low except in the vicinity of the bearing and opening corner where a local increase in compressive stresses occured.