Research purposes ： The orthogonal cross beam is benefit to the load transferring and construction assembling for the skew continuous steel - box girder bridge. In order to optimize this diaphragm arrangement further by simplifying the structure of the support point，a novel diaphragm arrangement idea was presented in this paper through canceling the inclined diaphragm at the support points of the middle pier. Then the feasibility of this idea was studied and verified.
Research conclusions ： (1) Taking a (30 + 35 ) m skew continuous steel - box girder as the engineering background，the finite shell element models of whole bridge were established. The calculated results show that this novel diaphragm arrangement can meet the design requirement both in the two aspects of the structure global mechanical behavior and local stress. (2) Compared with the oblique crossing diaphragm arrangement，the structure mechanical behavior has little difference regardless of the diaphragm arrangement is adopted when the skew angle is less. (3) By optimizing the structure details of the novel diaphragm arrangement further， its adaptability in the skew continuous steel - box girder bridge with large hollow box section and large skew angle was discussed. (4) The conclusions could provide some theoretical reference for the diaphragm design of the skew continuous steel - box girder bridge.