Rigorous versus less-demanding fragility relations for RC high-rise buildings
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Rigorous versus less‑demanding fragility relations for RC high‑rise buildings Wael Alwaeli1 · Aman Mwafy2 · Kypros Pilakoutas1 · Maurizio Guadagnini1 Received: 1 October 2019 / Accepted: 22 July 2020 © Springer Nature B.V. 2020
Abstract Analytical seismic scenario-based probabilistic fragility relations form the spine of earthquake risk assessment and mitigation of RC high-rise wall buildings. In this study, a framework is proposed to develop both rigorous (refined) and less-demanding (cheaper) fragility relations for such structures. Multi-record incremental dynamic analysis is employed using a new scalar intensity measure and net inter-storey drift as a consistent global damage measure for varying heights of buildings. To illustrate the framework, a 30-storey wall building located in a multiple-scenario earthquake-prone region is analysed. The refined fragility sets are derived using 40 real earthquake records representing two seismic scenarios, while the proposed methodology to develop less-demanding seismic scenario-based fragility relations employs a considerably lower number of earthquake records. In this methodology, a new record selection criterion and a fragility curve tolerance factor are introduced. Finally, the two fragility relation sets for the reference structure are developed, assessed, and compared to provide insights into their features and accuracy. Using the proposed methodology, the study revealed that fairly reliable seismic scenario-based fragility sets can be developed for RC high-rise buildings with a significant reduction in computational time and efforts. The proposed framework is generic and can be implemented to deriving refined and less-demanding fragility relations for RC high-rise buildings of different configurations and structural systems. Keywords Fragility · Seismic scenario · High-rise · Wall buildings · Inelastic dynamic analysis
1 Introduction The number of RC high-rise buildings has substantially increased all over the world, with more large cities spreading over earthquake-prone regions. The trend to increasingly construct RC high-rise structures is likely to continue with the rapid advances in material and construction technologies (Ali and Moon 2007). This raises the exposure of RC high-rise buildings to * Aman Mwafy [email protected] 1
The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD, UK
2
United Arab Emirates University, PO Box 15551, Al‑Ain, United Arab Emirates
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Vol.:(0123456789)
Bulletin of Earthquake Engineering
seismic risk and, consequently, the concern for the seismic vulnerability of this class of structures, particularly under the effect of multiple-scenario earthquakes. High-rise buildings are also at most risk from earthquake events since they represent a high level of financial investments and population densities. Fragility relations form the driving engine of earthquake loss assessment and mitigation platforms. In high-rise buildings, even small errors in the derived fragility sets may have a
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