Determination of Tuned Mass Damper Parameters and its performance in four-span Integral Bridge

In this paper, the performance of Tuned Mass Damper (TMD) control system in seismic response reduction of a four-span integral bridge is investigated. Two classic analytical methods and one optimization method are then employed to calculate TMD parameters. Then, the effect of selecting each of the three methods for calculating TMD parameters on the seismic response of the bridge is studied. Three objective functions are considered for optimization procedure in MATLAB. After calculating TMD parameters, nonlinear dynamic analysis of the bridge in transverse direction is carried out in OpenSees. The purpose of this study is to compare different methods in obtaining damper parameters and to introduce a method that calculates damper parameters in such a way that the damper has a better performance on the bridge. Numerical results indicate performance of the damper is affected by its parameters and selecting the objective function. It is recommended to use the optimization method for calculate the damper parameters with maximum lateral displacement of the deck midpoint objective function. Also the results show that the more reduction of the response is related to the response corresponding to the objective function. For the studied bridge, the maximum values of reduction of displacement and acceleration of the middle deck are equal to 22.4 and 17.7%, respectively, and for the base shear is 4.3%. Therefore, the lateral displacement of the deck midpoint objective function is introduced as the best goal function