Sensitivity analysis of friction and creep deformation effects on preload relaxation in offshore wind turbine bolted connections

Braithwaite, Jarryd; Goenaga, Iñigo Gómez; Tafazzolimoghaddam, Behrooz; Mehmanparast, Ali

doi:10.1016/j.apor.2020.102225

Cited by 13 publications

(1 citation statement)

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“…In conventional design of a building, the PF-HSB is considered as constant in service. However, several factors (i.e., friction and creep deformation) can affect the stress relaxation of high-strength bolts, which is no negligible problem in engineering [11]. Previously, Shi et al [12,13] experimentally investigated the variation law of the PF-HSB and they found that the PF-HSB gradually decreased with the increase in time after the final screwing of bolts.…”

Section: Introductionmentioning

confidence: 99%

Degradation Behavior of the Preload Force of High-Strength Bolts after Corrosion

et al. 2022

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Corrosion significantly affects the structural behavior of members in a connection (i.e., the thickness of steel plates, the preload force of bolts, and the friction factor of steel plates). Safety assessment of corroded steel frames (i.e., beam-to-column connection, beams, or columns) has been a major concern in engineering. In this work, an experiment of accelerated corrosion testing is carried out to obtain corroded specimens connected with high-strength bolts, and the preload force of high-strength bolts (PF-HSB) is monitored throughout the whole stage of the corrosion testing. Before the corrosion testing, the PF-HSB caused by the stress relaxation is also recorded. The PF-HSB decreases rapidly in the first five hours after the final screwing of bolts and it keeps stable after 100 h. The PF-HSB is seriously affected by corrosion, which decreases by 30.0% of the original preload force when the corrosion rate of steel plate reaches 3.5%. A finite element method for predicting the PF-HSB after corrosion is proposed. An estimation model for the PF-HSB considering the stress relaxation is established. A degradation model for predicting the PF-HSB after corrosion is also suggested, and is in good agreement with experimental data. The results of this research are of great significance for the safety assessment of in-service steel structures.

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Section: Introductionmentioning

confidence: 99%