Structural damage identification using enhanced charged system search algorithm

Changes in the dynamic properties of structures indicate an occurrence ofdamages in them. in this paper, the dynamic properties of damaged structures underdierent scenarios are obtained using suitable nite element modeling. an optimizationtechnique is then used to minimize the dierence between experimental and modeled data,i.e. to minimize the value of the objective function. in this paper, the charged systemsearch algorithm (css) is used for the optimization process. for enhancing the searchalgorithm, the input data is modied in a recursive process utilizing the results of previousiterations. natural frequency and mode shapes are used in the objective function. abeam and two frames are used to evaluate the performance of the algorithm. results showthat this algorithm is eective in damage detection and its performance is better whena curvature mode shape is used in place of a displacement mode shape. increasing theelement or the number of damaged elements does not aect the eciency of the algorithm,and only increases the number of iterations