Abstract
To make the design process, simplified; worldwide seismic codes incorporate response reduction factor (R), to account for the nonlinear response of structures using static linear analysis procedure. In general, seismic codes identify structures as ‘Regular’ or ‘Irregular’, based on their geometry or distribution of mass/stiffness/strength in plan/elevation. It is crucial, as identifying a particular building as regular, permits designers to use basic static linear analysis methodology without going for rigorous dynamic analysis. Thus, the focus of this work is to investigate the actual value of R for a structure at its Regularity Limit. The current study uses the Indian seismic code for seismic design and compares its recommended ‘R’ value with the actual ‘R’ value derived by the performance-based evaluation process for perfectly regular buildings and buildings at vertical geometric Regularity Limit (i.e., with maximum permissible vertical geometric irregularities prescribed by IS 1893). Static nonlinear analysis has been used to investigate the actual R value. The actual value of R is evaluated on two performance levels obtained for pushover analysis. The evaluated value of response reduction factor depends upon the height of building and geometry of the structure. The range of actual value of response reduction factor varies from 4.65 to 7.34. The outcome of the study shows that, for certain types of buildings, the recommended R values of the seismic code are higher than the actual one, thus these buildings can be identified as vulnerable for future seismic events.
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The authors would like to acknowledge and thank everyone who supported the entire research work. The authors are grateful to SGGSIE &T for providing licensed software’s to carry out research and the author will also like to appreciate Mr. Mayank Gupta for his valuable contribution at the time of submission of manuscript.
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Hazuria, K.H., Hashmi, A.K. & Patil, L.G. Performance-based evaluation of reinforced concrete buildings at vertical geometric regularity limit. Innov. Infrastruct. Solut. 8, 311 (2023). https://doi.org/10.1007/s41062-023-01266-8
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DOI: https://doi.org/10.1007/s41062-023-01266-8