Table 3: Initial lateral stiffness, initial natural period/frequency, and damping coefficient of shear frames used for the time history analyses.

FrameInitial lateral stiffness (×106 N/m)Initial natural period (s) (rad/s) (kN·s/m)

SF-N1.2550.33518.762.67
SF-RCVF12.130.107758.3462.38
SF-RC12.130.107758.348.32
SF-VF1.2550.33518.7620.06