Abstract
Abstract In a seismic evaluation of process equipment, anchor bolts for a component are required to resist against seismic conditions to support the component on the basement. Some components are directly fixed to the basement by anchor bolts, and anchor bolts of many cylindrical tanks or vessels are arranged on the circumference. Anchor bolts are basically designed in elastic base, but actual materials of them are confirmed to show plastic behavior by tensile testing. For rational evaluation for increasing seismic condition, an elastic-plastic analysis method has been studied to take account the condition that a few of the anchor bolts in circular arrangement become beyond elastic limit by seismic load. In this condition, even if yielding of a few bolts is occurred, it is expected that the other bolts within elastic limit bear against the seismic loads and keep equipment support function of the anchor bolts. To evaluate this condition, static loading tests using a reduced scale model of a cylindrical storage tank and static pushover analyses taking into account the elastic-plastic characteristics of the anchor bolt material were performed.
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