Available records of recent earthquakes show that near-field earthquakes have different characteristics than far-field
earthquakes. In general, most of these unique characteristics of near-fault records can be attributed to their forward directivity. This
phenomenon causes the records of ground motion normal to the fault to entail pulses with long periods in the velocity time history.
The energy of the earthquake is almost accumulated in these pulses causing large displacements and, accordingly, severe damages
in the building. Damage to structures caused by past earthquakes raises the need to assess the chance of future earthquake damage.
There are a variety of methods to evaluate building seismic vulnerabilities with different computational cost and accuracy. In the
meantime, fragility curves, which defines the possibility of structural damage as a function of ground motion characteristics and
design parameters, are more common. These curves express the percentage of probability that the structural response will exceed the
allowable performance limit at different seismic intensities. This study aims to obtain the fragility curve for low- and mid-rise
structures of reinforced concrete moment frames by incremental dynamic analysis (IDA). These frames were exposed to an
ensemble of 18 ground motions (nine records near-faults and nine records far-faults). Finally, after the analysis, their fragility curves
are obtained using the limit states provided by HAZUS-MH 2.1. The result shows the near-fault earthquakes can drastically
influence the fragility curves of the 6-story building while it has a minimal impact on those of the 3-story building.
پیوند مجله / همایش