The Effect of Structural Rigidity Uncertainties on ATMD Controlled Structures

Abstract

For efficiency of active control systems for seismically excited structures, and optimization process in need. This optimum design is defined according to the certain properties of structures, whereas the structural properties are found via several assumptions done in material strengths calculations and variable loading. These factors affect the mass and stiffness of the structure, but it is known that the main factor in the optimum design of control systems is the frequency that is related to mass and stiffness, generally. In this study, the stiffness of multiple degrees of freedom structure was reduced and increased to investigate the effect of the robustness of optimum active control systems for uncertainties. The numerical examination is done for a structure with an active tuned mass damper (ATMD) that is positioned on the top of the structure. For ±20 stiffness change of structure, the efficiency of ATMD is between 0.99% and 12.63% for the reduction of maximum displacement.