Abstract
An anchor-bolt-yield-type exposed column-base is typically used in low to medium-rise steel buildings. These column-base details are generally designed to consider the semi-rigid rotation spring, that caused by elastic/plastic elongation of anchor bolts. Such semirigid rotation spring stiffness (rotational rigidity) of column-base have a large effect on the seismic behavior of the building.In this paper, the authors proposed new type of column-base, that hysteresis same to a restoring force characteristics of generally type exposed column-base. And more, the new type of column base can controlled rotational rigidity. An experimental study has been carried out on new type of column-base subjected to cyclic loadings, and the following conclusions were drawn.1) Rotational rigidity of column base changed by the adjusting of anchor bolt length & column-base detail. 2) The proposed models of the restoring force characteristics showed good agreement with the experimental results for all specimens. 3) New type of column base having repaired performance, that anchor bolt can changed after the earthquake.
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