Torsional Behavior of Multistory Plan Asymmetric RC Building Under Seismic Load
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Date
2018-04
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AAU
Abstract
Nowadays, it is highly impossible to plan with regular shapes; due to architectural and
functional requirements; thus, horizontal and/or vertical irregularity may be developed.
These irregularities are responsible for the structural collapse of buildings under the action
of dynamic loads. Past and recent earthquakes events demonstrate that plan asymmetric
buildings are very susceptible to earthquake-induced damage due to torsional effects in
addition to translational effects. So, it is essential to investigate the seismic response of
these structures in active seismic zones to reduce the potential seismic damages. The
objectives of this thesis are to study the torsional behavior of reinforced concrete buildings
with plan asymmetry under earthquake load through parameters reflect the torsional
effects and recommending the practical solution in order to reduce the torsional effects.
To carry out the study, both regular reference and L-shaped plan asymmetric thirteen story
buildings, three-dimensional finite element models have been developed and analysis is
performed by modal response spectrum method according to EBCS EN 1998 2015 in
ETABS 2016. The results prove that buildings with severe plan asymmetries are more
vulnerable than those with regular counterpart resulting from torsion behavior. Two ways
in order to reduce the torsional irregularity effects resulted from plan asymmetry are
recommended as the practical solutions; those are an equivalent shear wall and diagrid
system. From the study, those systems have provided considerable reduction in responses
demand; based on such results, those ways in similar plan asymmetric building are
suggested.
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Keywords
Asymmetric RC Building, Seismic Load, Torsional Behavior, Multistory Plan