Predicting the Integrity of Existing Prestressed Concrete Bridge Deck Using Sonic Method

音波法檢測既有預力混凝土橋面版之完整性

梁明德(Ming-Te Liang) ； 吳伋(Jyi Wu)

《Journal of Marine Science and Technology》 9卷1期 (2001/06) Pp. 45-52

https://doi.org/10.6119/JMST.200106_9(1).0006

摘要

本文主要目的係提供採用音波法非破壞檢測預力混凝土橋面版之完整性的概念性方式。採用一維波動方程式結合初始條件作爲控制方程式，以傅立葉轉换求控制方程式之解析解，由此解析解推導位移、速度、力量及應力波等波傳公式，若忽略混凝土材料内之黏滯性，則應力波就可視爲音波，利用音波的波傳公式即可預測既有預力混凝土橋面版之完整性，預測結果可供維修及補強之依據，研究結果顯示音波法或許能夠檢測預力混凝土橋面版的裂縫位置，及預力鋼鍵腐蝕或斷裂的位置，音波法之主要優點也許在於不僅攜帶方便且使用簡捷，建議實驗應證。

並列摘要

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 one- dimensional 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.

並列關鍵字

corrosion damage ； integrity evaluation ； reflection coefficient ； sonic wave