抄録
This report considers the influence of initial tightening force which asks for axial force behavior of bolt to external load and is exerted on additional force and load factor (additional force / external force) when subjected to thermal load as external force about bolted joints which used the steel bolts products. In washer strength of the bolted joints, additional force and load factor by thermal external force are clarified. The thermal external force to maximum permission external force was clarified about the thermal load strength design of bolted joints.
