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Smart Structures and Systems Volume 22, Number 4, October 2018 , pages 383-397 DOI: https://doi.org/10.12989/sss.2018.22.4.383 |
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Seismic performance of a resilient low-damage base isolation system under combined vertical and horizontal excitations |
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Ehsan Noroozinejad Farsangi, Abbas Ali Tasnimi, T.Y. Yang,
Izuru Takewaki and Mohammad Mohammadhasani
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| Abstract | ||
| Traditional base isolation systems focus on isolating the seismic response of a structure in the horizontal direction. However, in regions where the vertical earthquake excitation is significant (such as near-fault region), a traditional base-isolated building exhibits a significant vertical vibration. To eliminate this shortcoming, a rocking-isolated system named Telescopic Column (TC) is proposed in this paper. Detailed rocking and isolation mechanism of the TC system is presented. The seismic performance of the TC is compared with the traditional elastomeric bearing (EB) and friction pendulum (FP) base-isolated systems. A 4-storey reinforced concrete moment-resisting frame (RC-MRF) is selected as the reference superstructure. The seismic response of the reference superstructure in terms of column axial forces, base shears, floor accelerations, inter-storey drift ratios (IDR) and collapse margin ratios (CMRs) are evaluated using OpenSees. The results of the nonlinear dynamic analysis subjected to multi-directional earthquake excitations show that the superstructure equipped with the newly proposed TC is more resilient and exhibits a superior response with higher margin of safety against collapse when compared with the same superstructure with the traditional base-isolation (BI) system. | ||
| Key Words | ||
| base Isolation; structural fuse; repairable structure; resilience; fragility curve; collapse margin; multi-components excitation; near-field; OpenSees | ||
| Address | ||
| Ehsan Noroozinejad Farsangi: Department of Earthquake Engineering, Graduate University of Advanced Technology (KGUT), Kerman, Iran Abbas Ali Tasnimi: Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran T.Y. Yang: International Joint Research Laboratory of Earthquake Engineering, Tongji University, Shanghai, China; Department of Civil Engineering, University of British Columbia, Vancouver, Canada Izuru Takewaki: Department of Architecture and Architectural Engineering, Kyoto University, Kyoto, Japan Mohammad Mohammadhasani: Seismology Engineering & Risk Department, Road, Housing & Urban Development Research Center (BHRC), Tehran, Iran | ||