Real-Time Structural Health Monitoring and Damage Identification Using Frequency Response Functions along with Finite Element Model Updating Technique

Abstract

Throughout service, damage can arise in the structure of buildings; hence, their dynamic testing becomes essential to verify that such buildings possess sufficient strength to withstand disturbances, particularly in the event of an earthquake. Dynamic testing, being uneconomical, requires proof of concept; for this, a model of a structure can be dynamically tested, and the results are used to update its finite element model. This can be used for damage detection in the prototype and aids in predicting its behavior during an earthquake. In this instance, a wireless MEMS accelerometer was used, which can measure the vibration signals emanating from the building and transfer these signals to a remote workstation. The base of the structure is excited using a shaking table to induce an earthquake-like situation. Four natural frequencies have been considered and six different types of damage conditions have been identified in this work. For each damage condition, the experimental responses are measured and the finite element model is updated using the Berman and Nagy method. It is seen that the updated models can predict the dynamic responses of the building accurately. Thus, depending on these responses, the damage condition can be identified by using the updated finite element models.

Experimental Investigation on the Heat Dissipation and Postfire Structural Performance of a Reinforced Concrete Column with Biomimicked Geometry

“…Following the UPV and rebound hammer tests, another test was performed, which was similar to the nondestructive evaluation. The natural frequency was determined, and the effect of dynamic characteristics was evaluated for the fire-affected specimens [53][54][55]. The natural frequency relies on the geometry and modulus of elasticity of a specific material.…”

Development of Recursive Subspace Identification for Real-Time Structural Health Monitoring under Seismic Loading

“…One promising way to provide online or real-time SHM is to perform system identifcation of time-varying dynamic characteristics and damage detection of the structural system [7,8]. System identifcation involves analyzing the dynamic behavior of a structure under various loading and environmental conditions and using this information to develop models that can accurately predict its responses to future conditions.…”

Experimental Study of Bridge Expansion Joint Damage Based on Natural Frequency

“…The modal parameters can be used to diagnose the health condition of the structure. Natural frequency has commonly been used with the development of modal analysis techniques [ 33 , 34 ].…”

“…The modal parameters can be used to diagnose the health condition of the structure. Natural frequency has commonly been used with the development of modal analysis techniques [33,34]. A numerical method based on distributed spring damping element considering the contact surface between tire and road surface Analysis of the dynamic impact caused by heavy vehicles crossing modal bridge expansion joints and its effect on bridge response…”