PSI - Issue 61

Adil Ziraoui et al. / Procedia Structural Integrity 61 (2024) 171–179 Adil Ziraoui et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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2. The LRB isolator demonstrates equal effectiveness in decreasing both storey displacement and inter-storey drift, achieving a reduction of nearly 50% or more when compared to a fixed-base reinforced concrete building. 3. The LRB isolation system offers a significant reduction in base shear, reaching nearly more than 60% compared with conventionally reinforced concrete buildings. 4. A substantial reduction in moments is also observed, reaching more than 70% thanks to the use of a base isolation system.

A particularly interesting observation is that the isolated base version of the reinforced concrete building initially has a lower seismic response than the fixed-base reinforced concrete building. However, when the base isolation is integrated into the reinforced concrete building, the latter's overall seismic response decreases extremely significantly. In fact, this seismic reduction reaches remarkable levels, typically ranging from 50 to 70% compared to the fixed-base reinforced concrete building. This finding highlights the considerable potential of base isolation to significantly improve the seismic resilience of reinforced concrete buildings. When properly implemented, this strategy can substantially reduce the response to seismic shocks, thus protecting the structure itself and its occupants. This drastic reduction in seismic response underlines the importance of earthquake engineering in the design of buildings to cope with seismic threats and improve their performance in the event of an earthquake. It also shows that reinforced concrete buildings can benefit considerably from isolation at the base to enhance their ability to withstand earthquakes and minimize potential damage. References Bhandari, M., Bharti, S.D., Shrimali, M.K., Datta, T.K., Assessment of proposed lateral load patterns in pushover analysis for base-isolated frames, Eng. Struct. 175 (2018) 531 – 548. Chen, C.; Yeh, K.; Liu, F. Adaptive fuzzy sliding model control for seismically excited bridges with lead rubber bearing isolation. Int. J. Uncertain. Fuzz. 2009, 17, 705 – 727. Deierlein, G., Krawinkler, G.H., Cornell, C.A.,Blume, J.A. 2003. A Framework for Performance-Based Earthquake Engineering. Hu, J., 2014. Response of Seismically Isolated Steel Frame Buildings with Sustainable Lead-Rubber Bearing (LRB) Isolator Devices Subjected to Near-Fault (NF) Ground Motions. Sustainability 7, 111 – 137. https://doi.org/10.3390/su7010111 Jangid, R.S. Optimum lead-rubber isolation bearings for near-fault motions. Eng. Struct. 2007, 29, 2503 – 2513. Kelly, T.E, Skinner, R.I, Robinson, W.H, Seismic isolation for designers and structural engineers, NICEE, 2010 Mazza, F.; Vulcano, A. Nonlinear response of RC framed buildings with isolation and supplemental damping at the base subjected to near-fault earthquakes. J. Earthq. Eng. 2009, 13, 690 – 715. Moehle, J., Deierlein, G.G. 2004. A Framework Methodology for Performance-Based Earthquake Engineering. Mollaioli, F; Lucchini, A; Cheng, Y.; Monti, G. Intensity measures for the seismic response prediction of base-isolated buildings. Bull. Earthq. Eng. 2013, 11, 1841 – 1866. Skinner, R.I., Robinson, W.H., G.H McVerry. 1993. An Introduction to Seismic Isolation. John Wiley & Sons Ltd, West Sussex. Smerzini, C., Galasso,C., Iervolino, I., Paolucci, R. 2014. Ground Motion Record Selection Based on Broadband Spectral Compatibility. Earthquake Spectra 30 (4): 1427 – 48. https://doi.org/10.1193/052312EQS197M. Spacone, E., El-Tawil, S., Nonlinear analysis of steel-concrete composite structures: state of the art, J. Struct. Eng. 130 (2) (2004) 159 – 168. Ziraoui, A., Kissi, B., Aaya, H., Azdine, I., 2023. Techno-Economic Study of Seismic Vulnerability in Reinforced Concrete Structures by Composite Materials. Int. Rev. Civ. Eng. IRECE 14, 561. https://doi.org/10.15866/irece.v14i6.22940 Ziraoui, A., Kissi, B., Aaya, H., mezriahi, Y., Haimoud, A., 2023. Seismic Retrofitting: Analyzing the Effectiveness of RC Shear Walls and CFRP Reinforcement for RC Structures. pp. 203 – 214. https://doi.org/10.1007/978-3-031-49345-4_21 Ziraoui, A., Kissi, B., Aaya, H., 2024. Probabilistic Analysis of FRP Efficacy in Seismic Risk Reduction. Forces Mech. 100259. https://doi.org/10.1016/j.finmec.2024.100259