Passive and hybrid mitigation of potential near-fault inner pounding of a self-braking seismic isolator |
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| Institution: | 1. Structural Engineering Department, Zagazig University, 44519 Zagazig, Egypt;2. Department of Applied Mathematics III, Universitat Politècnica de Catalunya–BarcelonaTECH, 08034 Barcelona, Spain;1. Norwegian Geotechnical Institute, Oslo 0806, Norway;2. Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;1. National Fusion Research Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon 34144, Republic of Korea;2. Korea Atomic Energy Research Institute, 111, Daedeok-daero 989 beon-gil, Yusung-gu, Daejeon 34057, Republic of Korea;3. Korea Hydro & Nuclear Power Co, Ltd, 70, Yuseong-daero 1312 beon-gil, Yusung-gu, Daejeon 34101, Republic of Korea |
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| Abstract: | A seismic isolated structure is usually a long-period structural system, which may encounter a low-frequency resonance problem when subjected to a near-fault earthquake that usually has a long-period pulse-like waveform. This long-period wave component may result in an enlargement of the base displacement and a decrease of the isolation efficiency. To overcome this problem, a rolling-based seismic isolator, referred to as roll-n-cage (RNC) isolator, has been recently proposed. The RNC isolator has a built-in buffer (braking) mechanism that limits the peak isolator displacements under severe earthquakes and prevents adjacent structural pounding. This paper addresses the problem of passive and hybrid mitigation of the potential inner pounding of the self-braking RNC isolator under near-fault earthquakes. Numerical results show that the RNC isolator can intrinsically limit the isolator displacements under near-fault earthquakes with less severe inner pounding using additional hysteretic damping and active control forces. |
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| Keywords: | Base isolation Roll-n-cage isolator Near-fault earthquakes Hybrid structural control Pounding Buffer mechanism |
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