Evaluating the nonlinear behavior of tall buildings with end shear walls through chaos theory

This study aimed to evaluate the behavior of the end shear wall under earthquake excitations, considering its chaotic behavior in the structure. The end shear wall decreased tensions and improved structural performance in lateral excitations of tall buildings by connecting the end of shear walls in all stories due to more tensions at the end flanges of shear walls. This study investigated the structural efficiency of end shear walls using nonlinear time history analysis in two 30-story buildings under far-field records. The two 30-story structures included reinforced concrete frames and shear walls with and without end shear walls, modeled for designing sections. The simulation was performed for nonlinear time history analysis. Also, investigations were conducted using chaos theory. The results indicated a 51% reduction in maximum drift ratio in 30 stories with end shear walls. In addition, the 30-story structure with end shear walls prevented the increasing chaos behavior in graphs such as Chebyshev, Gaussian, and logistic mapping, notably. The end shear walls played an influential role in the lateral load systems of a tall building.