Seismic performance of steel moment frames considering the effects of column-base hysteretic behavior and gravity framing system

This paper presents a parametric study conducted on five Steel Moment Frames (SMFs) varying in height (2-, 4-, 8-, 12-, and 20- story) to assess the interactive effect of column base hysteretic behavior, continuous gravity columns partially restrained beam-column connections their seismic performance. The frame response is examined through sophisticated Nonlinear Time History (NTH) Static Pushover (NSP) analyses as per FEMAp695 methodology. For each SMF, range connection strengths (and corresponding rotational stiffnesses) accompanied by different levels rigidity are assigned, resulting total 80 model simulations. Two collapse/failure limit states formulated for assessment 1) sidesway collapse defined FEMAp695; 2) column-base failure, rotations exceeding 0.05 rad threshold. Results from simulations indicate that framing system profoundly affects behavior SMFs analyzed reducing probability collapse. In this manner, demands design can be reduced safely, incorporating high deformation capacity part energy dissipative mechanisms. Potential implications discussed, limitations, well lines future research, outlined.