The Effects of Using Different Seismic Bearing on the Behavior and Seismic Response of High-Rise Building
Abstract: The effects of using
different seismic bearings were investigated to reduce the seismic response of
buildings by assuming the vulnerability of 20-story regular RC building in this
paper. The method of this study was that the studied building was studied in
three different models in terms of its connection to the foundation. In the
first model, the structures were placed on the rigid bearing and in the second
and third models; lead-rubber bearings and friction pendulum bearings were
placed at the counter between the structure and foundation, respectively. Then,
the dynamic analysis was used to assess the behaviour and seismic response of
the mentioned models. The results of the study showed that the structures in
the first model functioned like cantilever column that would become uniaxial
and biaxial bending under the effects of earthquake around the vertical axis of
structure. Due to the tensile (tension) weakness in concrete, seismic loads
caused major cracks in the tension part of the structures according to the
place of the neutral axis that could lead to the collapse of structure. In
addition, the use of mentioned seismic bearings under the earthquake caused the
structure like a semi-rigid box slid on this equipment that reduced the
structure's stiffness and increased the period of the structure in comparison
with the first model. Using the studied seismic bearings caused the
displacement of the roof of the first and twentieth stories of the structure
become approximately equal and prevented the creation of the bending moment in
the first model. The results of non-linear time history analysis showed that
using the studied seismic bearings caused the response of the structure reduced
significantly when the structure was placed on rigid bearings. It could be very
valuable regarding the limitation of the capacity of the structure's members.
Author: Saman Mansouri, Amin
Nazari
Journal Code: jptsipilgg170012
