OPTIMUM SELECTION AND SCALING OF ACCELEROGRAMS REQUIRED IN TIME HISTORY ANALYSIS OF SPATIAL STRUCTURES

The main target of this study is to propose and compare three approaches about selection of a set of suitable accelerograms and corresponding scale factors required in time history analysis of the structures, according to Eurocode-8. These accelerograms should be selected so that satisfy the requirements in the desired seismic code. Since this selection and scaling process will affect on structural demands, therefore this procedure can beconsidered as an optimization problem. In this paper, charged system search (CSS), a meta-heuristic optimization method, which has beensuccessfully applied for several engineering problems, is applied to find optimum records selection and their scale factors. Effectiveness of each approach has been investigated by someexamples. The results show that while all approaches satisfy the corresponding code requirements with small violation, but the first and second approach are more reliable.

accelerograms; record scaling; time history analysis; charged system search; eurocode-8.