Performance Evaluation of the Novel Passive Hybrid System Incorporating with Vertical Seismic Isolator and Tuned Mass Damper
Subject Areas : Analysis of Structure and Earthquake
Mohammad Amin Fadaie
1
,
مسعود نکویی
2
,
Mohammadreza Mansouri
3
1 - lecturer
2 -
3 - Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Keywords: Hybrid seismic control, Vertical mass isolation, stiffness subsystem, mass subsystem, Tune mass damper, isolation factor. ,
Abstract :
Vertical Mass Isolation (VMI) is a novel and rapidly developing approach in the seismic control of structures. In this method, the structure is separated into two subsystems—mass and stiffness—which are connected through a damper. The application of a Tuned Mass Damper (TMD) between these subsystems leads to effective vibration control under lateral loads. The hybrid passive control system proposed in this study combines the VMI and TMD mechanisms. Key parameters of the system, including the isolator stiffness, and the frequency and damping ratio of the TMD, are examined under various conditions to achieve optimal performance. The investigated models consist of 5 and 15 story steel structures analyzed under both seismic and harmonic excitations. The results indicate that the proposed hybrid system significantly improves the structural response compared to both the uncontrolled case and the case equipped with VMI alone. Specifically, reductions of 35% in peak mass displacement, 45% in peak base shear, and 30% in peak roof acceleration were observed relative to the uncontrolled structure. Moreover, in comparison with the structure equipped solely with VMI, the corresponding reductions were estimated to be 30%, 26%, and 27.4%, respectively. The proposed system demonstrates notable effectiveness under both seismic and harmonic loading, leading to considerable reductions in roof displacement, base shear, peak drift, and acceleration in both subsystems. Additionally, the overall performance level of the structure is improved, with its behavior remaining predominantly linear, thereby reducing structural responses and potential damage under lateral loads.
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