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The Neutral Axis as Damage Sensitive Feature

Speaker: Dorotea Sigurdardottir, Graduate Student
Series: MMS Brown Bag Seminars
Location: Engineering Quad E219
Date/Time: Tuesday, February 19, 2013, 12:30 p.m. - 1:30 p.m.


The most common bridge systems in the U.S. are based on beams, in fact, 60% of the U.S bridge network is based on beam systems. These typical bridges compose 70% of all deficient bridges in the U.S. In the road network, bridges are the essential links and critical hubs which connect regions across major obstacles, it can be vital to society to know if a bridge is safe to use or if it has experienced damage invisible to the human eye. The centroid of stiffness is a universal parameter and its position in a cross-section can be evaluated for any load-carrying beam structure as the position of the neutral axis under conveniently chosen loads. Thus, a change in the position of the neutral axis within a cross-section can indicate change in the position of the centroid of stiffness, i.e., unusual structural behaviors. The neutral axis has a potential to be used as a damage sensitive feature for the majority of bridges. In this study we use static and dynamic strain data to locate the neutral axis. The results show that the neutral axis location is varying even when damage is not present.