Evaluation of characteristic peak ground acceleration (CPGA) as a ground motion intensity measure to reduce the dispersion of IDA curves

The intensity measure (IM), as an index of ground motion record, is one of the most important issues to reduce the dispersion of incremental dynamic analysis (IDA) curves. In this study, a modified version of peak ground acceleration (PGA) of ground motion record called characteristic PGA (CPGA) is proposed as a new ground motion IM to reduce the dispersion of IDA curves. To obtain CPGA, a ground motion is decomposed into several frequency …