Structural health monitoring

About: Structural health monitoring is a research topic. Over the lifetime, 11727 publications have been published within this topic receiving 186231 citations.

Earthquake-Induced Damage Detection in a Monumental Masonry Bell-Tower Using Long-Term Dynamic Monitoring Data

Abstract: This work investigates the use of an advanced long-term vibration-based structural health monitoring tool to automatically detect earthquake-induced damages in heritage structures. Damage produced in a monumental bell-tower at increasing values of the Peak Ground Acceleration (PGA) of the seismic input is predicted by incremental nonlinear dynamic analysis, using a Finite Element model calibrated on the basis of experimentally identified natural modes. Then, predicted damage effects are artificially introduced in the monitoring data to check for their detectability. The results demonstrate that a very small damage, associated to a low intensity and low return period earthquake, is clearly detected by the monitoring system.

Guided-wave tomographic imaging of defects in pipe using a probabilistic reconstruction algorithm

Abstract: There has been much interest recently in monitoring the structural integrity of predetermined critical zones in pipeline using leave-in-place sensors. Ultrasonic guided waves have significant advantages over vibration and impedance methods for structural health monitoring. With guided waves it is possible to locate and size defect regions. The work presented here introduces a Reconstruction Algorithm for the Probabilistic Inspection of Damage (RAPID), which is used to construct tomographic images of multiple defects in a 16"-diameter schedule 30 steel pipe. Imaging is completed using an array of 16 low-cost transducers. It is shown that defect location and severity are accurately predicted by employing the RAPID algorithm with multifrequency data sets. A sparse array study is completed in which images are reconstructed using only eight of the 16 available transducers. It is found that damage can still be detected using the sparse array, though defect sizing and location accuracy suffer. It is shown that multiple defects can still be resolved using 13 of the original 16 transducers chosen at random.

Detection of Tension Loss in Cables of Cable-Stayed Bridges by Distributed Monitoring of Bridge Deck Strains

Abstract: Development of a simplified approach for monitoring the cables of cable-stayed bridges is described in this article. The method introduced in this paper uses the distributed measurement of strains along the bridge deck to detect the cables that have totally or partially lost their tensile force. The fundamental principle employed in formulating the method is the interrelationship between the individual cable forces and the bending moment along the bridge span. The proposed method was evaluated through an experimental program that involved fabrication and testing of a reduced scale model of a single plane cable-stayed bridge. Distributed strain along the span length was monitored by a Brillouin Optical (Neubrex, Hyogo, Japan) Time Domain Analysis fiber optic sensor system. Strain gauges, Fiber Bragg Grating sensors (Technica Optical Component, LLC, Beijing, China), and a finite element model of the bridge were employed for evaluating the efficiency of the proposed method. Several different damage c...