Prediction of the median IDA curve by employing a limited number of ground motion records

Abstract

A methodology has been proposed which can be used to reduce the number of ground motion records needed for the reliable prediction of the median seismic response of structures by means of incremental dynamic analysis (IDA). This methodology is presently limited to predictions of the median IDA curve only. The reduction in the number of ground motion records needed to predict the median IDA curve is achieved by introducing a precedence list of ground motion records. The determination of such a list is an optimization problem, which is solved in the paper by means of (1) a genetic algorithm and (2) a proposed simple procedure. The seismic response of a simple, computationally non-demanding structural model has been used as input data for the optimization problem. The presented example is a three-storey-reinforced concrete building, subjected to two sets of ground motion records, one a free-field set and the other a near-field set. It is shown that the median IDA curves can be predicted with acceptable accuracy by employing only four ground motion records instead of the 24 or 30 records, which are the total number of ground motion records for the free-field and near-field sets, respectively.

Incremental dynamic analysis with consideration of modeling uncertainties

“…It can be used to take into account the effect of the aleatory uncertainty (record-to-record variability) on the engineering 806 M. DOLSEK demand parameter (EDP) through the set of ground motion records (GMR), and is used for multiple purposes. For example, many researchers have used IDA for evaluation of the seismic performance of different types of structures [3][4][5] for studies related to advanced intensities measures [6,7] or damage measure [8], and for the validation of simplified procedures for the prediction of approximate IDA curves [9][10][11][12] or loss estimation methodologies [13].…”

Seismic assessment of steel frames with the endurance time method

“…The large number of nonlinear dynamic analyses needed for the IDA method and the large record-to-record variability of the responses are the main problems of this method. Researchers try to reduce the number of ground motion records needed for the reliable prediction of the seismic response of structures by means of IDA [15]. Others try to estimate IDA results by establishing a meaningful relationship between the pushover analysis and IDA results [16].…”

Seismic performance assessment of arch dams using incremental nonlinear dynamic analysis

“…the median IDA curve (Azarbakht & Dolšek, 2007). With this method, application of the IDA to three-dimensional (3D) large arch dams may still result in prohibitive computational cost.…”

“…The best representatives of the ground accelerations can be extracted from the selected records for the prediction of the IDA curves with sufficient accuracy (Azarbakht & Dolšek, 2007). Such an approach significantly decreases the number of ground motion records and reduces the computational effort.…”