Strain influence line method for identifying damage of arch bridge suspender

The invention relates to the technical field of bridge damage detection, and relates to a strain influence line method for identifying arch bridge suspender damage, the method comprises a theoretical process and an implementation process, the theoretical process comprises: 1, establishing a three-suspender through tied-arch bridge structural mechanical model; 2, applying a moving unit load to the mechanical model of the three-suspender through tied-arch bridge, and performing quasi-static strain influence line data acquisition work at other suspender positions; 3, establishing a cubic statically indeterminate force normal equation; 4, calculating and analyzing a suspender strain influence line difference curve in the theoretical model, and performing damage identification; 5, proposing a strain influence line difference differential curve, and establishing a damage identification index of a strain influence line difference curvature; according to the method, data are read from a plurality of suspenders, so th