Comparative Study on Noise Robusticity of Damage Locating Indices for Steel Box Girder of Long-span Cable-stayed Bridges

The full-scale dynamic characteristics and fine-scale local damage of steel box girder are studied by the substructuring method to realize structural multi-scale damage analysis with respect to Runyang Cable-stayed Bridge.The modal curvature index, modal strain energy index, modal flexibility index and cable tension index for damage localization of steel box girder are further comparatively studied with regard to noise resistance ability.The analysis results show that modal strain energy index and modal flexibility index are complementary to each other in damage location identification for steel box girder.