Computational Efficiency of Progressive Incremental Dynamic Analysis

Abstract eng:
Progressive incremental dynamic analysis involves precedence list of ground motion records aiming of selecting the most representative ground motions from a set of ground motions. The precedence list of ground motion records provides the advantage of a simple mathematical model, which is not computationally demanding, and it is defined as an optimization problem, which can be solved with sufficient accuracy by means of a simple procedure. Therefore, the seismic response parameters are computed progressively, starting from the first ground motion record in the precedence list. After an acceptable tolerance is achieved, the analysis can be terminated. Such approach facilitates practical application of incremental dynamic analysis (IDA), especially, if the number of ground motions in a set of ground motions is large, and its computational efficiency is higher than ordinary IDA. In the paper the precedence list of ground motion records is determined for three reinforced concrete frame structures in order to evaluate computational efficiency of the progressive IDA. The results indicate that 16th, 50th and 84th fractiles of seismic response parameters of frame structures can be determined with sufficient accuracy if about 12 to 15 records out of 30 are used in the analysis, this indicating that progressive IDA requires much less computational time than IDA.

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