Cable-stayed arch-truss is susceptible to interference or even suffering from misjudgment when using the diagnosis method of single damage index for damage identification. In order to solve this problem,a damage identification method,using recognition results of data fusion of the curvature modal difference and the modal flexibility difference curvature,is presented in this study. Based on two fusion criterions of D-S evidence matrix and the weighted average of the two criteria,the single-stage fusion and two-stage fusion methods are constructed. An analytical model is established using ANSYS and the rod damage is simulated by reducing sectional area of rods. Non-fusion,single-stage and two-stage fusion method are used to identify the rod damage separately. Results show that non-fusion single index has worst anti-interference ability,especially for the bottom chord near supports. The damage identification accuracy is effectively improved by using data fusion. Compared with weighted average criterion,D-S evidence matrix criterion is more effective in reducing the interference of non-damage locations and has better identification effect. Two-stage fusion method is more effective than single-stage fusion method,with the damage probability closer to 1 at damage locations and 0 at non-damage locations. Finally,a damage identification test of cable-stayed arch-truss model is carried out. Test results show that the present method is robust enough in identifying the damage of the actual structure,even under the influence of environmental or measurement noises. However,for the curvature modal difference and the modal flexibility difference curvature,it is difficult to identify the damage degree. Therefore,the method proposed here can only improve the recognition accuracy of the damage location.
