Performance comparison of lead rubber bearing and friction pendulum isolation systems on a school in Kathmandu

Ted Cross, Luca Lombardi, Flavia De Luca, Raffaele De Risi, Joe Beardsley, Maxwell de Podesta, Reggie Clark, Jack Rushton, Nicholas A Alexander, Anastasios Sextos

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Abstract

Relative performances of a lead rubber bearing (LRB) and a friction pendulum isolation system (FPS), for a school in Kathmandu are assessed. As a result of the 2015 Gorkha earthquake, the feasibility of implementing seismic isolation on schools in Kathmandu is investigated. Kathmandu is situated in a lacustrine basin, which results in the amplification of longer period spectral ordinates. This was clearly observed in ground motion waveforms recorded during the 2015 event in the Kathmandu basin. A school is designed in the area of Bhaktapur (in the Kathmandu basin) in accordance with local and international regulations and practices. Two isolation systems are designed and compared (i.e., LRB and FPS). The two isolation systems are nonlinearly modelled in the structural analysis opensource software OpenSees and time-history analyses (THA) are carried out considering different ground motions. Two sets of ground motions are considered: (i) a code-conforming ground motion selection and (ii) a number of recordings from the Kathmandu Valley. Both isolation techniques reduce the seismic demand of the structure and make it compliant to international standards. The interaction between the typical long period basin amplification in the Kathmandu valley and the fundamental periods of the isolated structures is the key point of comparison, leading to quantitative comparisons on the applicability of base isolation techniques in basin contexts and near-source regions such as Kathmandu Valley.
Original languageEnglish
Title of host publicationICONHIC2019 Proceedings
PublisherNational Technical University of Athens
Number of pages11
Publication statusPublished - 23 Jun 2019
Event2nd International Conference on Natural Hazards & Infrastructure | 23 – 26 June 2019 | Chania, GREECE - Chania, Greece
Duration: 23 Jun 201926 Jun 2019
https://iconhic.com/2019/

Publication series

Name
PublisherNational Technical University of Athens
ISSN (Print)2623-4513

Conference

Conference2nd International Conference on Natural Hazards & Infrastructure | 23 – 26 June 2019 | Chania, GREECE
Abbreviated titleICONHIC 2019
CountryGreece
CityChania
Period23/06/1926/06/19
Internet address

Keywords

  • Seismic Isolation
  • Lead Rubber Bearing
  • Friction Pendulum System
  • Nepal
  • Kathmandu Valley

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