The swinging column itself is what negatively affects the stiffness of the structure.That is to say it has negative stiffness.It needs the system to provide it with stiffness to ensure its stability.Try to let the swing column to meet its own stability, if necessary, can use the wall corner bracing and other means to improve the stability of the swing column, if the stability of the swing column is not satisfied, the burden on the system is heavier.