Axle Load Identification of Moving Vehicles Based on Influence Lines of Bridge Bending Moment

[摘要] This research aims at the identification of time varying axle load of moving vehicles though the determinations of influence lines of bridge bending moment.With the approach of this research, based on the theorem of modal superposition, the modal acceleration of the bridge subjected to moving loads is determined by the responding acceleration data of the sections. At any given time, the dynamic moment at a section is considered as a static moment due to the distributed inertia force and moving loads on the bridge. By using the bending moment influence line of the bridge, the relationship between the moments and the moving load is established. A method for identifying the moving loads though the bending moment influence lines is thus developed.With the application of the matrix singularity, there is no need to solve for dynamic equations and ill-conditioned matrix, and thus the proposed method is highly effcient for engineering applications.

[关键词] load identification;influence line;moving loads;modal superposition;bridge loading