Research on damping performance and parameter influence of new frame-MRD-core tube composite structural system

Abstract

The position of the plastic hinge is uncertain due to the design and construction of the frame-core tube structural system, causing problems such as reduced collapse resistance and difficulty in repairing after an earthquake. To address these problems, this paper proposes a new type of frame-magnetorheologicaldamper (MRD)-core tube composite damping structural system. In this system, the frame and the core tube are two independent structures connected by MRD. Based on the instantaneous optimal control algorithm, the semi-active control strategy of MRD is designed. The relative motion between structures is used to provide damping force, and the vibration control equation is established. In this paper, a 10-story reinforced concrete frame-MRD-core tube composite structural system is taken as an example, and the El Centro (NS, 1940) ground motion with the peak acceleration of 220 cm· S-2 is used as the lateral load for horizontal seismic time-history analysis. MATLAB is employed to perform numerical simulation calculations to investigate its damping effect and related influence parameters. Compared with the traditional frame-core tube structural system, the new system can reduce the top floor displacement and the maximum interstory drift by more than 50% and reduce the top floor acceleration of the frame and core tube by 65% and 40%, respectively. Furthermore, reasonably optimizing the position of the control floor can reduce the number of dampers. When the interstory control is implemented, the total control force of dampers can be reduced by 18% compared to the full-story control. This article provides a new damping idea and theoretical reference basis for the engineering design and application of the frame-core tube composite structural system.