عارفه اكبرزاده عبداللهي

Controlling the seismic behavior of irregular structures remains a key challenge in structural and earthquake engineering, as these structures inherently exhibit complex and nonlinear responses to seismic forces. Torsional irregular structures, particularly when inadequately designed or structurally damaged, experience torsional motions under dynamic loads such as earthquakes, which can lead to significant damage. Managing this torsion requires advanced control strategies. One effective approach is adaptive control, which utilizes learning algorithms to automatically adjust control parameters and adapt dynamically to changing conditions. In this study, a novel method called Modal Adaptive Control (MAC) is introduced and developed based on adaptive control principles. This method defines the desired modal coordinates and adjusts control forces in real-time based on structural feedback, ensuring that the structure’s modal coordinates gradually converge to predefined reference coordinates within the modal coordinate system. In addition to adapting to varying conditions, this method enables effective management of structural vibration modes through the modal coordinate framework, demonstrating its superiority over conventional adaptive control techniques. To eva‎luate the effectiveness of the proposed method, three-dimensional models of torsionally irregular structures were simulated and analyzed under multi-directional earthquake excitations. The dynamic response of the structures was obtained in both uncontrolled (linear) and controlled (nonlinear) conditions using MAC. The results indicate that this method significantly reduces torsional oscillations, decreases both absolute and relative roof displacements in all degrees of freedom, and enhances overall structural stability. Additionally, it effectively reduces base forces while ensuring a more uniform stress distribution at critical points, leading to improved structural resilience during seismic events. This research confirms the efficiency of Modal Adaptive Control in mitigating structural damage and enhancing the durability and stability of torsionally irregular structures under multi-directional seismic excitations.

نامنظمي پيچشي , كنترل تطبيقي , كنترل تطبيقي مودال

Torsional Irregularity , Adaptive Control , Modal Adaptive Control

Arefeh Akbarzadeh Abdolahi

Dr. Pedram Ghaderi