Pole placement algorithm for control of civil structures subjected to earthquake excitation

In this paper the control algorithm for controlled civil structures subjected to earthquake excitation is thoroughly investigated. The structural control consists of monitoring and analyzing the incoming excitation signal and the response of structure, applying the control algorithm for the calculation of the required control action, and, finally, implementing this action to the structure. The objective of this work is the control of structures by means of the pole placement algorithm, in order to improve their responseagainst earthquake actions. The pole placement or pole assignment algorithm is a well-known, classical control algorithm that estimates the feedback matrix so that the system will have poles (eigenvalues) that are pre-decided by the designer. Successful application of the algorithm requires judicious placement of the closed-loop eigenvalues from the part of the designer. The pole placement algorithm was widely applied to control mechanical systems. In this paper, a modification in the mathematical background of the algorithm in order to be suitable for civil fixed structures is primarily presented. The proposed approach is demonstrated by numerical simulations for the control of both single and multi-degree of freedom systems subjected to seismic actions. Numerical results have shown that the control algorithm is efficient in reducing the response of building structures, with small amount of required control forces

Keywords:

Structural control , Pole placement , Structural Dynamics , Earthquake Engineering