Nonlinear Behavior of Irregularly Shaped Reinforced Concrete Buildings with Different X-Bracing Positions

Abstract

Horizontally irregular structures are popular in modern urban design due to aesthetics and the limited availability of land. Horizontal irregularities may improve the structure's architectural appeal but might substantially impact its performance. Previous research has demonstrated that buildings with irregular configurations are destroyed by significant ground motion. Bracings are a common method for ensuring structural safety during significant earthquake occurrences. These bracings can be placed in different positions in a structure. In this context, the present study aims to determine the most effective position of X-bracing configuration which can be used to minimize the damage of horizontal irregular shape structures. In this study, irregularly shaped RC structures are investigated with and without steel bracings in different positions in frames. The nonlinear static analysis is performed for all the models. All the modeling, design, and analysis are performed in ETABS. The results are reported in terms of Maximum story displacements, inter-story drifts, base shear, Fundamental time periods, story stiffness, torsional irregularity, capacity curves, and plastic hinge formations. The results indicate that, if the position of the bracing in the frames is properly considered, the steel bracing is effectively used as retrofitting process in buildings of irregular shapes.