Modal analysis is the foundation of seismic analysis. The Uncoupled Modal Response History Analysis (UMRHA) method can efficiently extract complex nonlinear seismic responses into individual mode responses, providing valuable insights into the contribution from each mode. The computation time of UMRHA is also significantly less than the well-known Nonlinear Response History Analysis (NLRHA). The application of UMRHA could significantly reduce computational efforts when structures need to be analyzed with various ground motions. While UMRHA accurately estimates global and story-level responses, Authors: Jirapat,,Watchawong;Pennung,,Warnitchai. Presented at TSER2023.