Abstract
The influence of the uplift of building base on an earthquake response is studied, using a multi-degree-of-freedom system of which parameters are assumed to be equal to the characteristics of actual building. Based on a dynamic response analysis, the following conclusions are obtained. 1) Uplift occurrence can be judged simply by using the proposed chart with good accuracy. 2) The response base shear force coefficient decreases when the uplift occurs. In some cases, the coefficient decreases to about 20% of the uplift restraint case. 3) The reduction of the base shear force by the uplift tends to increase in the case that the uplift occurs easily. 4) The uplift displacement can be controlled with decreasing the story shear force by adding attenuation material to the uplift part.
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