Seismic Performance Analysis of High-Rise Structures Using Nonlinear Dynamic Methods

This study investigates the seismic performance of high-rise structures using nonlinear dynamic time-history analysis. The research integrates geometric, material, and seismic parameters to evaluate structural responses under varying Peak Ground Acceleration (PGA) levels. Nonlinear finite element modeling was employed to capture stiffness degradation, energy dissipation, and post-yield behavior during strong ground motions. Key response metrics such as interstory drift, base shear, roof displacement, and overturning moment were analyzed to classify performance levels based on FEMA-356 criteria. Results indicate that first-mode vibrations dominate the overall response, while higher modes influence local accelerations. As seismic intensity increases, structures transition from elastic to inelastic behavior, reaching Collapse Prevention limits at extreme PGA values. The study demonstrates that nonlinear dynamic analysis provides realistic insight into the true seismic resilience of tall buildings, supporting the development of performance-based seismic design strategies for safer and more reliable high-rise structures.