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Alternative Method to Estimate IDA Curves

Reza Karami Mohammadi 1, Homayoon Shahryari 1, and Mona Hemmati 2
1. Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran
2. Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, USA

Abstract—The conventional Incremental Dynamic Analysis (IDA), which is a series of nonlinear dynamic analysis, has been developed to study structural performance under earthquakes. Based on the methodology, a structural model is subjected to an earthquake record which is scaled to several seismic levels. These analyses are presented through one or more curves, the Damage Measure (DM) of the structure against the Intensity Measure (IM) of the earthquake record, known as IDA curves. By considering the high volume of computational efforts in the conventional incremental dynamic analysis, this paper presents a methodology to estimate IDA curves using capacity curves. For this purpose, the accuracy of the suggested method was investigated for 3-story SAC SEATTLE model under 20 different earthquake records by OpenSees. The results have revealed a reasonable accordance between two methods. The run time of the new suggested approach proved that the method is fast and computationally beneficial to be applied for estimating IDA curves. 

Index Terms—capacity curve, incremental dynamic analysis, IDA curves, performance based design

Cite: Reza Karami Mohammadi, Homayoon Shahryari, and Mona Hemmati, "Alternative Method to Estimate IDA Curves," International Journal of Structural and Civil Engineering Research, Vol. 9, No. 1, pp. 64-71, February 2020. doi: 10.18178/ijscer.9.1.64-71