A novel slip-critical blind bolt: Experimental studies on shear, tensile and combined tensile–shear resistances

Gao, Xing; Wang, Wei; Teh, Lip H.; Zhuang, Lijun

doi:10.1016/j.tws.2021.108630

Cited by 16 publications

(2 citation statements)

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“…By substituting Equations ( 3) and ( 5) into Equation ( 6), the loaded TOF can be calculated as Equation (7). Because As \\ 1, the equation can be estimated as Equation (8). Then the change of the travelling time caused by stress Dt(s) can be calculated as Equation (9).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…[2][3][4][5][6][7] Among the various blind bolting systems currently available, the slipcritical blind bolt (SCBB) is one of the very few that can achieve the same pre-tension as the conventional high strength bolts (Figure 1). 8 Appropriate pretension is critical for the safety of bolted joints with SCBBs, and even for the safety of whole structure. [9][10][11][12] For high strength bolts, especially the slip-critical type, preload plays an essential role in their mechanical 1 performance.…”

Section: Introductionmentioning

confidence: 99%

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Bolt load looseness measurement for slip-critical blind bolt by ultrasonic technique: a feasibility study with calibration and experimental verification

Gao

2023

Structural Health Monitoring

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Preload is important for the performance of bolted connections, especially for high strength bolt like slip-critical blind bolt (SCBB). There have been relatively few studies focused on detecting the looseness of blind bolts prior to this research. This article proposes a method based on the acoustoelastic effect to monitor the change in the preload in the bolt and detect the relaxation from the initial preload. The technique is suitable for such blind bolted connection because it only needs to connect with one side of bolted connection, unlike some other bolted connection monitoring methods. Considering that for SCBB, the traditional acoustoelastic technique cannot be applied because it needs the unstressed state of the bolt as baseline. The relationship between looseness of bolt load and change of travelling time is deduced. The measuring objective is then changed to the looseness of bolt load, instead of the bolt load itself. The practical processes of calibration, real-time monitoring and periodical detection are proposed, considering the application on real construction site. The tests on different configurations of SCBBs prove the reliability of the ultrasonic technique based on change in time-of-flight.

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Section: Theoretical Backgroundmentioning

confidence: 99%