Abstract
The objective of this study is to examine the effect of uplift of spread foundations on seismic response of bridges with viscous dampers used as seismic response control dampers based on the results of seismic response analysis. It is found that when damping force of viscous dampers, which are connected to abutments, becomes larger, the maximum value of curvature that occurs in plastic hinges of bridge piers becomes smaller, even if uplift occurs. It is also found that uplift reduces curvature when curvature becomes significantly larger than the yield curvature of the plastic hinges if uplift doesn't occur. On the other hand, it is found that when damping force of viscous dampers, which are connected to bridge piers, becomes larger than a prescribed value, maximum value of curvature, which occurs in plastic hinges of bridge piers, becomes larger even if uplift occurs.
