Abstract
Slip-resistant shear connections with preloaded bolts have traditionally been used in steel structures exposed to cyclic / fatigue loading or in cases when bolt slipping or connection deformations should be restricted. Hence, shear load is transferred through friction surfaces rather than through contact between the bolt surface and the hole. The main influencing parameters determining slip resistance of the connection are the friction between contact surfaces and the bolt preload level. This paper presents an experimental study of preloaded bolted connections under cyclic load, the main objective being to investigate the influence of cyclic load on the losses of preload force in high strength bolts and lock bolts.
Highlights
Bolted preloaded slip-resistant connections are often used in steel structures when slip between connected members should be restricted. and in cases when the structure is subjected to variable loads or high stress ranges, which may lead to fatigue damage
The results for HV and HBT bolts considering each reference time point are respectively tabulated in Table 8 and Table 9, where Fp,C,max is the maximum high strength bolt preload achieved during installation; Fp,C,ti is the bolt preload measured in Specimen label / installation method Bolt label
The impact the cyclic loading has on the loss of preload forces in the high strength bolt (HV) and Lockbolt (HBT) was assessed using an experimental procedure based on the assumption that limiting the stress range in the specimen corresponds to 75 % of the value defined as the limit for detail class 112 [33]
Summary
Bolted preloaded slip-resistant connections are often used in steel structures when slip between connected members should be restricted. and in cases when the structure is subjected to variable loads or high stress ranges, which may lead to fatigue damage. If the contact pressure on the contact surface is high enough to cause the corrosion protection layer to creep, a loss of preload will occur in the bolt and, in the connection as well, leading to a decrease in slip resistance of the connection [6]. Research has shown that the total preload loss in high strength bolts is highly dependent on the type and thickness of the corrosion protection applied to friction surfaces[7,8,9]. The overall thickness of the corrosion protection increases with an increase in the number of plates in the friction connection, leading to lower axial stiffness (Young’s modulus) of the materials and, to a significant loss of preload in high strength bolts [10].
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