Reducing the Seismic Responses in Two Adjacent Connected Structures by Using a Seismic Isolation System for One of the Structures

Subject Areas : Analysis of Structure and Earthquake

Fatemeh Shafaghnia ¹ , Reza Milanchian ² , رضا سجودی زاده ³ , Omid Hadad ⁴

1 - Department of civil engineering Management, Mahabad Branch, Islamic Azad University, Mahabad, Iran
2 - Department of civil engineering Management, Mahabad Branch, Islamic Azad University, Mahabad, Iran
3 -
4 - Department of civil engineering Management, Mahabad Branch, Islamic Azad University, Mahabad, Iran

Received: 2023-12-15 Accepted : 2024-04-02 Published : 2025-03-10

Keywords: Structural Vibration Control, Seismic Isolator, Passive Control, Connected Structures, Earthquake.. ,

Abstract :

The inevitable occurrence of earthquakes and the resulting significant human and financial losses emphasize the necessity of finding an appropriate and reliable solution to counter this natural phenomenon. The experience of recent earthquakes shows that structures designed according to modern codes and executed correctly generally perform well during seismic events. This study examines the impact of physically connecting two adjacent structures using dampers and implementing a seismic isolation system in one of them, along with its effect on the behavior of the other structure. In other words, it investigates two connected structures, one in a controlled state and the other in an uncontrolled state. The primary objective of this article is to analyze the interaction between the controlled and uncontrolled structures, evaluating how the controlled structure influences the improvement of the uncontrolled structure’s behavior through their connection. In this regard, two five-story building structures are initially designed and connected at the floor levels. Subsequently, a base isolation system is implemented in one of the buildings. By formulating the equations of motion for the structural system, the uncontrolled and controlled responses of the structures are calculated. The controlled response of the structure equipped with the base isolation system and the affected response of the adjacent uncontrolled structure are computed, with results indicating the effectiveness of the implemented control system in improving the performance of the adjacent structural system by reducing structural responses. According to the results, if Building 1 is solely equipped with vibration control measures, its response under the Tabas earthquake record is reduced by up to 54%. However, if Building 1 is connected to Building 2 and only Building 1 employs the control system, the effectiveness increases to 63%, demonstrating the suitable performance of the additional dampers installed at the floor levels connecting the two structures. Controlling Building 1 also leads to significant changes in the behavior of Building 2, which, in the case of the Loma Prieta earthquake, results in an approximately 33% reduction in response

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