This investigation examined the influence of inclined viscous damper on column axial force in a simple one-story frame building for harinonic loading and earthquake ground motion. It is shown that the peak column axial force in a system with inclined damper can be several times that in a system with horizontal damper, both having the same damping ratio. The amplification factor increases with increasing ratio of the forcing frequency to the system's natural frequency for harmonic loading, and with increasing system's natural vibration period for earthquake loading; the amplification also increases with increasing damping ratio. Furthermore, the peak column axial force lags the peak displacement-related elastic forces significantly. A proper consideration of this phase lag may be important for accurate estimation of the design actions in columns.


Civil and Environmental Engineering



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