DAMAGE IDENTIFICATION AND ASSESSMENT IN RC STRUCTURES USING VIBRATION DATA: A REVIEW

Moatasem Mohammed Fayyadh,Hashim Abdul Razak

doi:10.3846/13923730.2012.744773

Moatasem Mohammed Fayyadh, Hashim Abdul Razak

Open Access

https://doi.org/10.3846/13923730.2012.744773

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Abstract

Inspection of structural components for damage is essential to decision-making for the maintenance of such structures. There have been many studies to assess the reinforced concrete (RC) structural elements. However, the experimental approach is still based on the conventional static test, which is time-consuming, costly, has intensive equipment and labour requirements and causes major disruptions to the existing use. Modal testing provides an integrated approach, i.e. both local and global characteristics can be ascertained for structural assessment. Depending on the accessibility to damage elements, little or no disruption to the existing use is incurred during testing works. The approach towards structural assessment work provides not only a viable but also a robust, less expensive and powerful alternative to conventional techniques. This paper presents the background of the behaviour of the RC material at different loading and unloading conditions, in order to understand its effect on the modal parameters. The use of modal testing for support stiffness deterioration is highlighted and studies on the use of modal testing for classification of damage source are presented. Studies on the use of modal testing for detection of damage severity and location algorithms and procedures are also presented.

Highlights

Many reinforced concrete (RC) structures, when exposed to various external loads such as earthquakes, traffic, blasts and vibrations, suffer damage and deterioration over the years
Modal testing is one of the vibration analysis tools providing measurements of dynamic characteristics that enable designing for optical dynamic behaviour or solving structural dynamic problems in existing designs
This paper presents the background of the behaviour of the RC material, i.e. concrete and steel, at different loading conditions, in order to understand the composite action of the RC structural elements at Corresponding author

Summary

Introduction

Many reinforced concrete (RC) structures, when exposed to various external loads such as earthquakes, traffic, blasts and vibrations, suffer damage and deterioration over the years. RC structures can be subjected to damage due to internal causes or material characteristics such as corrosion of reinforcement bars, segregation of concrete materials and alkali-aggregate reactions. Modal testing is one of the vibration analysis tools providing measurements of dynamic characteristics (natural frequency, mode shapes and modal damping) that enable designing for optical dynamic behaviour or solving structural dynamic problems in existing designs. The basic idea behind this approach is that modal parameters, i.e. natural frequency, mode shape and modal damping, are functions of physical properties of a structure, namely mass, damping and stiffness. Any change in the physical properties will cause detectable changes in the modal parameters. Studies on the detection of damage severity and location algorithms and procedures are presented

Composite actions of RC structures

Damage source classification

Findings

Future directions