2. INCREMENTAL DYNAMIC ANALYSIS
Incremental Dynamic Analysis is a parametric method where a structure is subjected to a series
of non-linear ground motion time-histories of increasing intensity [4], with the objective of
attaining an accurate indication of the actual dynamic response of a structure subjected to
earthquake action. Comparison between results of incremental dynamic analysis and pushover
analysis can be made, for instance, in terms of a base shear-top displacement relationship. Each
IDA point is evaluated by selecting maximum top displacement reached during each dynamic
analysis and corresponding maximum base shear inside a temporal interval of ±0.5 seconds.
Although mean value curve obtained from points corresponding to different dynamic analyses is
not a base shear-top displacement relations, it can be considered a significant statistic trend, that
pushover analysis wants to reproduce. In the present study, The input for dynamic analyses are
four spectrum-compatible artificial accelerograms (results are indicated as AR-1, AR-2, AR-3,
AR-4). The response spectrum from [5], has been employed, considering seismic zone class 2 and
ground type B.