Department of Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
Centre of Excellence for Fundamental Studies in Structural Engineering, Iran University of Science and Technology, Narmak, Tehran, P.O. Box 16846-13114, Iran
Changes in the dynamic properties of structures indicate an occurrence of damages in them. In this paper, the dynamic properties of damaged structures under different scenarios are obtained using suitable nite element modeling. An optimization technique 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 System Search Algorithm (CSS) is used for the optimization process. For enhancing the search algorithm, the input data is modied in a recursive process utilizing the results of previous iterations. Natural frequency and mode shapes are used in the objective function. A beam and two frames are used to evaluate the performance of the algorithm. Results show that this algorithm is eective in damage detection and its performance is better when a curvature mode shape is used in place of a displacement mode shape. Increasing the element or the number of damaged elements does not aect the eciency of the algorithm, and only increases the number of iterations.