چكيده به لاتين
Controlling and improving the behavior of structures subjected to external excitation such as strong winds and seismic ground motions is one of the biggest challenges structural engineers face today, and the large scale damage caused by these disturbances have underscored the importance of structural control systems.
In this study, an Adaptive Back Stepping Control method that in recent years has attracted great attention in various fields of engineering science is proposed to mitigate the detrimental effects of earthquakes on civil structures. Due to the difficulties in real-time measurement of ground motion acceleration; it is assumed that these data are not available for control purposes. First, these uncertain data are estimated by appropriate adaptive law. Then, an adaptive back stepping control strategy is used to propose a control law which only depends upon feedback measurements of displacement and velocity vectors; moreover, this study considers application of improved Capacity-Demand-Diagram method in control of structural system. In order to evaluate the efficiency of proposed control system, numerical example (5-story steel moment frame structure) is defined and studied. In comparison to the widely used Linear Quadratic Regulation (LQR), the Adaptive Back Stepping Control method was shown to be just as effective and better in the reduction of structural responses during large earthquakes.
