Abstract
In seismic design, it is important to consider uncertainties in structural response. Although experimental data of material variations has been accumulated, there is very few data of nonlinear dynamic structural response to be able to evaluate quantitatively. This paper presents 3D shake table experiments on 16 middle-scale reinforced concrete bridge column type specimens at E-Defense. Simultaneous excitation of specimens on the same shake table can guarantee the same dynamic inputs. As the results, the COV of the displacement response of the first nonlinear excitation was found to be not so large because the response on the skeleton curve was much more stable than the response in the hysteresis loops. This result can be the evidence to support validity of the current displacement-based seismic design.
