Institut für Geophysik und Geologie, Universität Leipzig, Talstraße 35, 04109 Leipzig, Germany.
J Acoust Soc Am. 2011 Apr;129(4):1945-52. doi: 10.1121/1.3553226.
Coda wave interferometry is a recent analysis method now widely used in seismology. It uses the increased sensitivity of multiply scattered elastic waves with long travel-times for monitoring weak changes in a medium. While its application for structural monitoring has been shown to work under laboratory conditions, the usability on a real structure with known material changes had yet to be proven. This article presents experiments on a concrete bridge during construction. The results show that small velocity perturbations induced by a changing stress state in the structure can be determined even under adverse conditions. Theoretical estimations based on the stress calculations by the structural engineers are in good agreement with the measured velocity variations.
尾波干涉测量是一种最近发展起来的分析方法，目前在地震学中得到了广泛应用。它利用多次散射弹性波的长传播时间的灵敏度来监测介质中的微弱变化。虽然已经证明该方法在实验室条件下对结构监测有效，但在具有已知材料变化的实际结构上的可用性尚未得到证明。本文介绍了在施工过程中的混凝土桥梁上进行的实验。结果表明，即使在不利条件下，也可以确定由结构中应力状态变化引起的小速度扰动。基于结构工程师的应力计算的理论估计与测量的速度变化吻合良好。
