Vibration Control of Frame Structures Subjected to the Blast Loading by Active Control Proposed Algorithm

The blast loadings lead to serious damages in structures so that designers try to reduce these effects by special methods. In comparison with other threats such as earthquake and wind, the blast load has some unique characteristics i.e. the applied pressure to the structure, the situation of the blast source and small duration of blast loading. In this paper, a new approach is proposed for controlling the structural vibrations arising from the blast loads. The proposed active control method is based on structural dynamics theories in which multi actuators and sensors are utilized. Each actuator force ismodeled as an equivalent viscous damper so that several lower vibration modes are damped critically. This subject is achieved by simple mathematical formulation. The proposed method does not depend on the type of dynamic load and it could be applied to control structures with multiple degrees of freedom. For numerical verification of proposed method, several criterions such as maximum displacement, maximum kinetic energy and maximum drift are evaluated in a five story shear building, subjected to the blast load. The results show that the proposed method has suitable efficiency for reducing structural vibrations caused from blast loading.