Abstract
The chapter explores the experimental research on tightening sequences and strain relaxation of high-strength bolts in end-plate connections. More and more high-strength bolts have been used in steel structures in recent years because bolted connections have the advantages of fast construction and easy quality control. End-plate connection is one type of joint often used in steel structures. Usually there are many bolts in an end-plate connection, so it becomes a problem by which sequence the bolts should be tightened. In order to study influences of tightening sequences of high-strength bolts in end-plate connections on the pretension force of the bolts, various sequences are adopted during the tightening of the high-strength bolts in eight specimens. Based on the comparison and analysis of this problem, the American specification presents a solution that both the initial phase of compacting the joint and the subsequent phase of pretensioning should begin at the most rigidly fixed point or the stiffest point, and the Chinese specification presents a solution that the high-strength bolts should be tightened from the middle part of the bolts group to the outside. Proposals for the construction pretension force and the pretension force design value of high strength bolts in end-plate connections are presented in the chapter.
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