Torsional Behavior of Multistory Plan Asymmetric RC Building Under Seismic Load

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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.



Asymmetric RC Building, Seismic Load, Torsional Behavior, Multistory Plan