Abstract :
Near-field ground motions are significantly
severely affected on seismic response of structure compared
with far-field ground motions, and the reason is that the nearsource
forward directivity ground motions contain pulselong
periods. Therefore, the cumulative effects of far-fault
records are minor. The damage and collapse of engineering
structures observed in the last decades’ earthquakes show the
potential of damage in existing structures under near-field
ground motions. One important subject studied by earthquake
engineers as part of a performance-based approach is
the determination of demand and collapse capacity under
near-field earthquake. Different methods for evaluating
seismic structural performance have been suggested along
with and as part of the development of performance-based
earthquake engineering. This study investigated the results
of illustrious characteristics of near-fault ground motions on
the seismic response of reinforced concrete (RC) structures,
by the use of Incremental Nonlinear Dynamic Analysis
(IDA) method. Due to the fact that various ground motions
result in different intensity-versus-response plots, this analysis
is done again under various ground motions in order to
achieve significant statistical averages. The OpenSees software
was used to conduct nonlinear structural evaluations.
Numerical modelling showed that near-source outcomes
cause most of the seismic energy from the rupture to arrive in
a single coherent long-period pulse of motion and permanent
ground displacements. Finally, a vulnerability of RC building
can be evaluated against pulse-like near-fault ground
motions effects.
