Relationship between seismic energy demand and inter story drift across floors in tall buildings

This study investigates the relationship between seismic energy demand and inter-story drift in tall buildings using a nonlinear fiber-based modeling approach. A ۲۰-story steel moment-resisting frame, designed based on AISC and ASCE standards, was subjected to ۴۴ far-field earthquake records from the FEMA P۶۹۵ database. A modified opensees framework, enhanced to compute time-dependent energy components, was employed to evaluate input, hysteretic, damping, and kinetic energy distributions throughout the structure. Results reveal a clear correlation between peak ground acceleration (PGA) and both roof drift and energy demand, with energy dissipation primarily occurring in the lower stories. Hysteretic energy in beams emerges as the dominant dissipation mechanism, especially at higher drift levels, while columns largely remain elastic. The analysis highlights the importance of beam plasticity and strong column integrity to ensure structural resilience. Furthermore, a strong alignment between energy profiles and drift patterns suggests inter-story drift is a reliable metric for assessing seismic energy distribution.

کلیدواژه ها:

Energy distribution ، Steel moment frame ، High-rise frame ، Story drift ، PGA