Abstract
To investigate the dynamic increase factor (DIF) for nonlinear static (NS) alternate path analysis, the nonlinear dynamic (ND) and static analysis of a 6-storey reinforced concrete (RC) frame with specially shaped columns are carried out by utilizing OpenSees after the corner, side or inner column is removed respectively. Using the vertical displacement of removal column top node and axial force of adjacent column as control, reasonable value of DIF in the NS analysis are estimated according to the analysis results. A DIF about 1.8, 1.2 and 1.4 could capture the dynamic responses in corner, side or inner column removal scenario respectively when a static analysis is performed. The DIF in corner column removal scenario increases with the increasing of the floor on which the failure column locates and reaches the peak value at the top floor, while the DIF in inner or side column removal scenario decrease slightly. The DIF of inner or side column removal scenario increases linearly with the elongation of the beam span. The reinforcement of frame with specially shaped columns has little effect on the DIF.
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