Damage Detection of Simply Supported Beam by Residual Force Method
B.Malar Nivetha,  Dr. S.Parivallal,  Dr.D.Suji
Structural health monitoring (SHM) involves the observation of a structure or mechanical system over time using periodically spaced measurements, the extraction of damage-sensitive features from these measurements and the statistical analysis of these features to determine the current state of system health. Modal frequencies and mode shapes are the most popular parameters used in damage identification. The basic idea of these techniques is that modal parameters are functions of physical properties of structure (mass, damping and stiffness). Therefore, changes in physical properties will cause changes in modal properties. Structural damage identification based on residual force method is studied in this paper. Residual modal force is used as an indicator of structural damage. This residual modal force is caused by changes in structural parameters due to the occurrence of damage. A simulated simply supported beam with assumed damage scenario is used to demonstrate the approach.
Numerical study has been carried out on a beam of size 230mmx300mm and of length 3000mm. The beam is subjected to different simulated damage scenarios i.e., single damage, double damage and multi damage and degree of damage. If a structural member is cracked, the crack will decrease the stiffness and thereby decrease the eigen frequencies of the structure hence here, damage is introduced as the reduction in stiffness by altering the young’s modulus. The beam is modelled and dynamic characteristics such as frequency and mode shapes are calculated through finite element software ABAQUS. The stiffness for 3D finite element model is calculated by use of MATLAB. By using residual force vector the damage is identified.
Keywords- structural health monitoring, residual force method, eigen frequencies, dynamic characteristics
Unique Identification Number - IJEDR1602313Page Number(s) - 1784-1789Pubished in - Volume 4 | Issue 2 | June 2016DOI (Digital Object Identifier) -    Publisher - IJEDR (ISSN - 2321-9939)
Cite this Article
B.Malar Nivetha,  Dr. S.Parivallal,  Dr.D.Suji,   "Damage Detection of Simply Supported Beam by Residual Force Method"
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.4, Issue 2, pp.1784-1789, June 2016, Available at :http://www.ijedr.org/papers/IJEDR1602313.pdf