Rehabilitation of exposed-type column base in steel gymnasium
Exposed-type column base
Restoring force characteristics
The large damage to column bases of steel gymnasiums by the Hyogoken-nanbu Earthquake was occurred. The main damage to exposed-type column bases was the fracture of anchor bolts. The most column bases of existing steel structures constructed before 1981 were designed pinned-type ones. The experiments on fixed-type column bases have been carried out and the restoring force characteristics are known to be slip-type ones. In this paper, the column bases in existing K-elementary school gymnasium and normally pinned-type ones are experimented to obtain the restoring force characteristics. In addition, the new devices invented by authors are attached the anchor bolts to improve the slip-type restoring force characteristics. The experimental results are in good agreement with the analytical ones.