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Adaptive Passive Seismic Isolation System for Mitigating the Acceleration Response of Floor-Mounted Equipment
| 题名： | Adaptive Passive Seismic Isolation System for Mitigating the Acceleration Response of Floor-Mounted Equipment |
| 正文语种： | eng |
| 作者： | Kenneth K. Walsh;Claudia Marin-Artieda;Keanu McElroy |
| 作者单位： | Ohio Univ.;Howard Univ.;Ohio Univ. |
| 摘要： | Abstract Protecting critical equipment in seismically excited buildings is essential to ensure functionality after an earthquake. Individual equipment or equipment sets can be seismically isolated from the building motion. Special isolators can be employed to mitigate the most severe accelerations that occur in the horizontal direction of a building. This paper presents the results of an investigation of the performance of an uncoupled bidirectional isolation system for horizontal isolation using a novel adaptive restoring force (ARF) device. The device changes the structural response transmitted to floor-mounted equipment by filtering the most intense portions of input floor acceleration histories to minimize the acceleration of the equipment and the stress demands imposed by the supporting structures. The ARF device utilizes restoring and damping elements to generate restoring forces that vary nonlinearly with displacement, resulting in a force–displacement curve with varying slopes and loading and unloading paths. The force–displacement relationship of the ARF device is characterized by high stiffness at small and large displacements, and low stiffness in between. A small-scale prototype was constructed to validate the ARF concept, and its force–displacement properties were observed for cyclic loading. A numerical model was developed that accurately predicted the relationship between the device force and displacement. The system’s performance was evaluated through numerical analysis of equipment installed on different levels of multistory buildings subjected to measured floor accelerations. The results showed that the horizontal isolation system effectively limited the transmission of the floor accelerations to the equipment. Furthermore, the results showed that the isolation system transformed the seismic acceleration profile from a high-amplitude and -frequency signal to one with a low quasi-constant amplitude and low frequency, acting as a low-pass filter under the most intense time window of the floor acceleration. |
| 出版年： | 2024 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 150 |
| 期： | 1 |
| 页码： | 1.1-1.12 |
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