Finite element analysis of the impact-echo testing at a concrete slab with complex boundary conditions

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Finite element analysis of the impact-echo testing at a concrete slab with complex boundary conditions

Cho, Mi Ra / Lee, Hyun Suk / Kim, Hyun Ho / Kim, Ki Bong

Impact-echo method has been used for the non-destructive integrity assessment of structure members. In the sound structure members with simple boundary conditions, the impact-echo method has been proved to be successful in evaluating structural integrity. However, complex boundary conditions or irregular shapes of the structure members cause complication in impact-echo measurements. In this study, a series of finite element analyses for the impact-echo testing was performed to obtain a priori information on the impact echo testing at the composite bridge deck with a steel girder. For this purpose, the numerical simulation of the impact-echo testing was performed in three different formats: 1, measurement of the horizontal response for the vertical impact, 2, measurement of the vertical response for the vertical impact, and 3, measurement of the horizontal response for the horizontal impact. The finite element modeling of the impact-echo testing confirmed the benefit of adopting the measurement of horizontal responses, and provided the fundamental frame for the structural integrity assessment of a composite bridge deck with a steel girder.