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Abstract

The principal objective of this paper was provided a general idea for predicting the integrity of existing prestressed concrete bridge decks by using sonic method. The governing equation is a onedimensional wave equation with initial conditions. The method of Fourier transform was adopted for seeking D'Alembert's solution which is an analytical solution of the governing equation. Furthermore, the wave formulae such as displacement, velocity, force and stress waves were derived from the analytical solution. If the viscosity effect of material was neglected, then the elastic wave can be reduced as the sonic wave. Through these sonic wave formulae, the damage position of the existing prestressed concrete bridge deck may be predicted by using the sonic testing method. The predicted results can be offered as a basis of repair, reinforcement and demolition in service. The results of the present conception indicate that the sonic method may be really to predict the cracked position of the existing prestressed concrete bridge decks and the position of corrosion or failure of steel tendon. The advantage of the sonic method may be not only portable but also convenient.

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