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Seismic response evaluation of base-isolated reinforced concrete buildings under bidirectional excitation

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Abstract

This paper reports on an investigation of the seismic response of base-isolated reinforced concrete buildings, which considers various isolation system parameters under bidirectional near-fault and far-fault motions. Three-dimensional models of 4-, 8-, and 12-story base-isolated buildings with nonlinear effects in the isolation system and the superstructure are investigated, and nonlinear response history analysis is carried out. The bounding values of isolation system properties that incorporate the aging effect of isolators are also taken into account, as is the current state of practice in the design and analysis of base-isolated buildings. The response indicators of the buildings are studied for near-fault and far-fault motions weight-scaled to represent the design earthquake (DE) level and the risk-targeted maximum considered earthquake (MCER) level. Results of the nonlinear response history analyses indicate no structural damage under DE-level motions for near-fault and far-fault motions and for MCER-level far-fault motions, whereas minor structural damage is observed under MCER-level near-fault motions. Results of the base-isolated buildings are compared with their fixed-base counterparts. Significant reduction of the superstructure response of the 12-story base-isolated building compared to the fixed-base condition indicates that base isolation can be effectively used in taller buildings to enhance performance. Additionally, the applicability of a rigid superstructure to predict the isolator displacement demand is also investigated. It is found that the isolator displacements can be estimated accurately using a rigid body model for the superstructure for the buildings considered.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Tokyo, 152-8552, Japan

    Satish Bhagat & Anil C. Wijeyewickrema

  2. Department of Civil Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan

    Anil C. Wijeyewickrema

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  1. Satish Bhagat
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  2. Anil C. Wijeyewickrema
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Correspondence to Anil C. Wijeyewickrema.

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Bhagat, S., Wijeyewickrema, A.C. Seismic response evaluation of base-isolated reinforced concrete buildings under bidirectional excitation. Earthq. Eng. Eng. Vib. 16, 365–382 (2017). https://doi.org/10.1007/s11803-017-0387-8

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  • DOI: https://doi.org/10.1007/s11803-017-0387-8

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