Arch bridge damage detection method based on catenary hinge-free arch strain influence line curvature

The invention discloses an arch bridge damage detection method based on catenary hinge-free arch strain influence line curvature, and belongs to the technical field of arch bridge damage detection. The method is combined with unhinged single-arch finite element instance analysis, is used for damage identification research of the unhinged arch structure, studies the influence of the influence line measuring point position, the local damage position and degree and the test noise on the identification result, and establishes the influence line difference curvature amplitude curve under different damage working conditions, and fits the damage degree-amplitude relation formula to identify the damage of the unhinged arch structure. Inverting the damage degree to realize accurate quantification of the damage; in combination with verification of a steel truss railway arch bridge structure model example, the damage detection method can accurately position the damage position of the arch structure, quantify the damage