Modal Based Structural Damage Detection Using Genetic Algorithm

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					            Modal Based Structural Damage Detection Using Genetic
                                 Algorithm
                                   V. Srinivas and K. Ramanjaneyulu
   Scientist, Bridge Engineering Group, Software Building, Structural Engineering Research Centre,
                                                 Taramani,
                                          Chennai 600 113, India
                                  srinivas@sercm.org; rams@sercm.org
Abstract
The area of damage detection and localization using measured vibration data has attracted considerable
attention in recent years. In damage detection of structures using genetic algorithm, the aim is to
formulate an objective function in terms of parameters related to the physical properties and state of the
structure. In the present work, the objective function has been formulated using the changes in
frequencies and mode shapes and damage detection process has been carried out using genetic search
algorithm. Stiffness reduction factors have been used as the parameters for identification of the damage
and its localization. The present methodology has been verified for beam and truss structures for single
and multiple damage scenarios. It is observed that the present methodology of damage detection based
on genetic search procedure using frequency and MAC values is capable of identifying the damage
with good accuracy.
Keywords: Vibration; Damage detection; Frequencies; Modal assurance criteria; Objective function; Genetic
Algorithm