Semi-active control of structures with MR and Orifice dampers subjected to underground blast-induced vibration

Using the control tools is an efficient method to decreasing the responses of the structure under the external excitations. In this regard, this study investigates the performance of two structures equipped with MR dampers and Orifice dampers under the blast-induced vibration. In addition to stimulating the underground blast induced vibration (Due to the different nature of these loads), seismic excitation has also been used to evaluate the efficiency of these dampers. These dampers are semi-active devices, which change the output force of the damper by changing the input voltage and magnetic field of dampers. Also, in this paper, clipped-optimal algorithm was used. This algorithm can generate optimal damper force by changing the voltage at each time step based on the input forces. In this research, structural responses based on optimal and maximum voltage are considered. Also, Numerical results of structure are compared with LQR algorithm. LQR algorithm is considered as a criterion for reducing structural responses to the blast-induced vibration. The results indicate that the proposed method (the different locations and types of dampers) is efficient for decreasing the responses of structure.