عنوان مجله
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Journal of Earthquake and Tsunami
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چکیده
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To estimate seismic demand and capacity of structures, it has been suggested by researchers
that Incremental Dynamic Analysis (IDA) is one of the most accurate methods. Although this
method shows the most accurate response of the structure, some problems, such as di±culty in
modeling, time-consuming analysis and selection of the earthquake records, encourage
researchers to ¯nd some ways to estimate the dynamic response of structures by using static
nonlinear analysis. The simplicity of pushover analysis in evaluating structural nonlinear
response serves well as an alternative to the time-history analysis method. In this paper, based
on the concepts of the displacement-based adaptive pushover (DAP), a new approach is proposed to estimate the IDA curves. The performance of the proposed method has been investigated using 3- and 9-story moment-resisting frames. In addition, the results were compared with
exact IDA curves and IDA curves developed by the modal pushover analysis (MPA) based
method. For evaluation, IDA curves with 16%, 50% and 84% fractile were estimated. Using the
results, max capacities corresponding to Collapse Prevention (CP) limit state were calculated
and assessed. Finite element modeling of the structures has been carried out by using ZEUS-NL
software. Based on the achieved results, the proposed approach can estimate the capacity of the
structure accurately. The signi¯cant advantage of the applied approach is the low computational cost and desirable accuracy. The proposed approach can be used to develop the approximate IDA curves.
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