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.

Real-Time Dynamic Model Updating of a Hysteretic Structural System

Abstract: Linear model updating techniques have been successfully applied in structural health monitoring (SHM) for assessing structural conditions. However, civil structures generally exhibit nonlinear hysteretic behavior under damaging loading conditions. Updating nonlinear models is necessary to represent a structure’s deteriorating behaviors. Here, an approach is proposed to update a hysteretic model in real time. An experimental study is conducted to demonstrate the use of this nonlinear updating technique on a lab-sized shear building. A recently proposed modified Bouc-Wen model is used. A numerical study is performed to demonstrate the capabilities of the model updating technique in identifying the nonlinear model. The need for deionizing filters is also emphasized. The experimental study considers quasistatic cyclic tests to characterize the nonlinear behavior of the structure, and two shake table tests for demonstrating the proposed approach in the prediction of future responses. Comparison of the error indexes shows that the real-time updated model can be used to predict the response of the tested building structure during strong motion inputs. The real-time testbed developed in this study has the potential to enable rapid structural diagnosis and prognosis, and will facilitate many other engineering applications, such as rapid risk assessment and structural control design.

Truly Distributed Optical Fiber Sensors for Structural Health Monitoring: From the Telecommunication Optical Fiber Drawling Tower to Water Leakage Detection in Dikes and Concrete Structure Strain Monitoring

Abstract: Although optical fiber sensors have been developed for 30 years, there is a gap between lab experiments and field applications. This article focuses on specific methods developed to evaluate the whole sensing chain, with an emphasis on (i) commercially-available optoelectronic instruments and (ii) sensing cable. A number of additional considerations for a successful pairing of these two must be taken into account for successful field applications. These considerations are further developed within this article and illustrated with practical applications of water leakage detection in dikes and concrete structures monitoring, making use of distributed temperature and strain sensing based on Rayleigh, Raman, and Brillouin scattering in optical fibers. They include an adequate choice of working wavelengths, dedicated localization processes, choices of connector type, and further include a useful selection of traditional reference sensors to be installed nearby the optical fiber sensors, as well as temperature compensation in case of strain sensing.

Convolutional Neural Network Approach for Robust Structural Damage Detection and Localization

Abstract: Damage diagnosis has been a challenging inverse problem in structural health monitoring. The main difficulty is characterizing the unknown relation between the measurements and damage patte...