Development of Absorbed Energy and Stiffness-Based Damage Index for Vertical Irregular Buildings

Development of Absorbed Energy and Stiffness-Based Damage Index for Vertical Irregular Buildings

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© 2022 by IJETT Journal
Volume-70 Issue-8
Year of Publication : 2022
Authors : Hemil M Chauhan, Kaushal B. Parikh
DOI : 10.14445/22315381/IJETT-V70I8P238

How to Cite?

Hemil M Chauhan, Kaushal B. Parikh, "Development of Absorbed Energy and Stiffness-Based Damage Index for Vertical Irregular Buildings," International Journal of Engineering Trends and Technology, vol. 70, no. 8, pp. 375-386, 2022. Crossref, https://doi.org/10.14445/22315381/IJETT-V70I8P238

Abstract
In the present study, the seismic damage of a building is estimated as damage indices based on absorbed energy and degraded stiffness by performing pushover analysis. A new stiffness-based damage index is proposed, considering the cumulative effects of increasing each lateral load or displacement for each step of nonlinear static analysis. A non-cumulative absorbed energy-based damage index is presented using the pushover curve's first maximum hysteretic cycle. The proposed methods are applied on 4, 6 and 9-storey regular and vertical irregular setback types of 3D buildings. Three regular and irregular buildings of varying heights, setback directions and monotonic loads are selected to estimate the capability of the proposed damage indices. Further, the proposed damage indices are calibrated with existing deformation and strength-based damage indices. Both damage indices can calculate damage index at any point of the pushover curve; however, the damage indices are computed on different performance levels during this study. The damage index studies demonstrated that two methods for evaluating damage to irregular buildings are simple and accurate; they could also help designers estimate the global damage index as a performance criterion in a short time using pushover analysis results.

Keywords
Energy-based damage index, Performance-based seismic design, Pushover analysis, Stiffness-based damage index, Vertical irregular buildings.

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