Kaatsiz, KaanSucuoglu, Haluk2025-03-2120241363-2469https://hdl.handle.net/11727/12524Torsional status indicators of asymmetrical plan systems are evaluated. The ratio of two modal participation factors in a translational direction (lower to higher mode) is proved as a more accurate indicator than the ratio of translation and rotation dominant modal periods. Seismic responses of low-rise asymmetric-plan frames are then assessed through linear elastic and nonlinear response analysis of representative systems under bi-axial ground motion pairs. The results revealed that those systems that are initially identified as torsionally stiff exhibit a torsionally stiff nonlinear response, whereas those initially categorized as torsionally balanced or flexible evolve to a stiffer torsional performance.en-USAsymmetric systemsplan irregularitytorsional status indicatorstorsionally stifftorsionally flexibleaccidental eccentricityArticle0010234884000012-s2.0-85164605267