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Publication - Professor Anastasios Sextos

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

    Citation

    Cross, T, Lombardi, L, De Luca, F, De Risi, R, Beardsley, J, Podesta, Md, Clark, R, Rushton, J, Alexander, NA & Sextos, A, 2019, ‘Performance comparison of lead rubber bearing and friction pendulum isolation systems on a school in Kathmandu’. in: Performance comparison of lead rubber bearing and friction pendulum isolation systems on a school in Kathmandu. National Technical University of Athens

    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.

    Full details in the University publications repository