1.绪言最近,伴随着结构件的合理化和大型化,可以看到用螺栓将结构件连接成整体的情况是很多的。为了确保这些构件的可靠性,在进行正确设计的同时,采用能够正确指示螺栓设计中所要求的紧固力的装置,对于螺栓紧固是重要之点。特别是构件承受交变载荷时,考虑到螺栓的疲劳、控制其使之有适当的预紧力是有 1. INTRODUCTION Recently, with the rationalization and enlargement of structural parts, it can be seen that there are many cases in which structural members are bolted together. In order to ensure the reliability of these components, it is important for the bolting to use the device that correctly indicates the required tightening force in the bolt design while properly designing. In particular, the components to withstand alternating loads, taking into account the fatigue of the bolt, it is controlled so that the appropriate preload there