Defallah, Haneen Mosbah Rateb
(2009)
Influence Of Excitation Angles Of Ground Motion With
Forward Directivity Effect On The Response Of Regular
And Symmetric Reinforced Concrete Buildings.
Masters thesis, Universiti Sains Malaysia.
Abstract
Existing procedure of seismic analysis was to apply ground motion components at
the principal axes, which may not produce a maximum structural response. In order
to ensure an acceptable level of reliability of analysis when performing a design, it is
important to find the critical excitation angle that produces the maximum structural
response. To investigate values of inter-story drift ratio, the current research applied
nonlinear inelastic dynamic analysis to a six story RC building with four different
fundamental periods, by adjusting the inertia value of the models without redesigning
the building. Seven sets of ground motions were applied at various angles (ranging
from 0° to 170°) to each building. These ground motions exhibiting the forward
directivity effect and the acceleration records were scaled up and down to account for
more or less severe ground motions from the same record. Incremental dynamic
analysis (IDA) curves were formed to study the effects of different excitation angles
on the structural responses and to specify the critical excitation angle.
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