Effect of variation in design acceleration spectrum on the seismic resilience of a building
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ORIGINAL PAPER
Effect of variation in design acceleration spectrum on the seismic resilience of a building S. Prasanth1 · Goutam Ghosh1 Received: 1 May 2020 / Accepted: 20 October 2020 © Springer Nature Switzerland AG 2020
Abstract Past studies have shown that the ground motion is of a highly random nature. It was found in past literature that there exist large variations in ground motion characteristics at other sites for the same earthquake, as well as for the same site from other earthquakes. These large variations in ground motion characteristics illustrate the difficulties in accurately predicting demands of future earthquakes which always leads us to the challenge in identifying the design ground motions that gives a reasonable probability of having credible design provisions. The present study is focused on finding the effect of variations in ground motions on an important design parameter, seismic resilience of a building. The change in ground motion characteristics has been considered through the design acceleration spectrum of the Indian Standard code IS:1893–2016 (Part-1) which depends on several factors viz. Zone factor (Z), importance factor (I) and response reduction factor (R). An existing reinforced concrete building of G + 10 storey with I = 1.5 and R = 5 was considered. The behavior of the building was examined for the six combinations of I/R ratio and corresponding drop down in the functionality and the seismic resilience was evaluated. The result shows the existing building has a significant increase in the demand displacement, demand ductility and loss in seismic resilience at the combination I = 1.5 and R = 3 with increase in the cumulative damage probability of exceedance corresponding to the “Extreme” and “Collapse” state. This was due to the sudden increase in future seismic acceleration (Ah) when compared with designed seismic acceleration. Keywords Vulnerability · Resilience · Ductility · Fragility · Recovery time
Introduction In recent years, the natural disaster has had a serious impact on human society. Recent advances in coping with disasters have become the principle of resilience-based design. This concept deals with society’s readiness to resolve the catastrophe incident in terms of "recovery" at an optimal rate. Factors such as recovery time and damage estimation play a crucial role in the structure’s resilience quantification. The effect of various ground motions on the seismic resilience/functionality of non-ductile and limited ductile reinforced concrete building was studied (Belejo et al. 2013; Javad Hashemi et al. 2019). As per Indian Standard * S. Prasanth [email protected] Goutam Ghosh [email protected] 1
Civil Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, India
(IS:1893–2016, Part-1), the response reduction factor (R) given is significantly higher compared to the actual scenario (Mondal et al. 2013). The corrected response redution factor (R) value with respect to the earthquake series was found. The outco
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