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Smart Structures and Systems Volume 20, Number 3, September 2017 , pages 303-309 DOI: https://doi.org/10.12989/sss.2017.20.3.303 |
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Design approach of high damping rubber bearing for seismic isolation |
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Patrick L.Y. Tiong, James M. Kelly and Tan T. Or
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| Abstract | ||
| Structural control through seismic isolation using elastomeric rubber bearing, which is also known as High Damping Rubber Bearing (HDRB), has seen an increase in use to provide protective from earthquake, especially for new buildings in earthquake zones. Besides, HDRB has also been used in structural rehabilitation of older yet significant buildings, such as museums and palaces. However, the present design approach applied in normal practice has often resulted in dissimilar HDRB dimension requirement between structural designers and bearing manufacturers mainly due to ineffective communication. Therefore, in order to ease the design process, most HDRB manufacturers have come up with catalogs that list all necessary and relevant product lines specifically for structural engineers to choose from. In fact, these catalogs contain physical dimension, compression property, shear characteristic, and most importantly, the total rubber thickness. Nonetheless, other complicated issues, such as the relationship between target isolation period and displacement demand (which determines the total rubber thickness), are omitted due to cul-de-sac fixing of these values in the catalogs. As such, this paper presents a formula, which is derived and extended from the present design approach, in order to offer a simple guideline for engineers to estimate the required HDRB size. This improved design formula successfully minimizes the discrepancies stumbled upon among structural designers, builders, and rubber bearing manufacturers in terms of variation order issue at the designing stage because manufacturer of isolator is always the last to be appointed in most projects. | ||
| Key Words | ||
| structural control; seismic mitigation; base isolation; seismic bearing; bearing design | ||
| Address | ||
| Patrick L.Y. Tiong: Research and Development Division, Base Isolation Technology (Asia) Sdn Bhd, Lot PT 34252, Jalan Sekolah, Rantau Panjang, 42100 Klang, Selangor Darul Ehsan, Malaysia James M. Kelly: Department of Civil and Environmental Engineering, 782 Davis Hall, University of California, 94720-1710 Berkeley, United States of America Tan T. Or: Doshin Rubber Products (M) Sdn Bhd, Lot PT 34252, Jalan Sekolah, Rantau Panjang, 42100 Klang, Selangor Darul Ehsan, Malaysia | ||