Research and Application of Attached Load Method on Bridge Test

In view of the advantage of the dynamic attached load nondestructive testing technique, the quantificational relationship of structure natural frequency and attached loads on common sections simple-supported beam-bridge is researched based on finite element method and numerical analysis method, including T-beam or hollow slab. The work will simplify the process of model building and datum analysis. Furthermore, to improve the application scope of the relationship, effects of the section form and the material density on the natural frequency are discussed. Results showed that the average error of different ratio of section height-to-span is less than 8%. And effects of density on structures frequencies of different sections beams and bridges are uniform.