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[I-336] Analytical study on simple vibration characteristics evaluation of small-scale bridge using small FWD

〇Daiki Yaegashi¹, Hiroshi Onishi², Shoji Iwasaki¹, Yoko Chiba³ (1.Showa Civic Design Corporation, 2.Iwate University, 3.Yamagata College of Industry and Technology)

Keywords:Impact vibration test, 3D FEM analysis, health dgree

In Japan, to perform appropriate maintenance is required to extend the life span of existing bridges. The vibration charactoristics of bridges are mainly used for evaluating the health degrees of them. In this study, the authors aim to establish a quantitative and simple method for evaluating the soundness of bridges through an impact vibration test using a small FWD. We applying FFT to the response acceleration waveform obtained by the test. The natural frequencies of the target bridge and its floor slab were obtained. Next, eigenvalue analysis was performed on the 3D FEM superstructure model of the target bridge, and the slab stiffness value was confirmed.