A Study on Initial Value Setting Method for Relaxation Tests in High Strength Bolted Joints

Minami, Kuniaki; Tamura, Hiroshi; Uchida, Daisuke; Shirahata, Hiromi; Yoshioka, Natsuki; Tsutsui, Kouhei; Fujino, Daichi

doi:10.2208/jscejseee.76.3_496

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…The two bolts at the fix side were tightened using the torque method by shear wrench until the bolt tip sheared, and before the slippage test increased the design bolt axial force by 20% (205 kN×1.2=246 kN) using the torque method. The initially introduced bolt axial force was measured 3 seconds after the peak of tightening [14] and the axial force was measured at 1 second interval until 1 hour after tightening, at intervals of 1 minute until 24 hours after tightening, and at intervals of 15 minutes thereafter.…”

Section: Bolt Axial Forcementioning

confidence: 99%

Effect of Surface Coating Condition on High‐friction Organic Zinc‐rich Paints for HSFB Joints

Zou,

Yamaguchi,

Ueno

et al. 2023

ce papers

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With the development of paints, high‐friction organic zinc‐rich paints with slip coefficients more than 0.45 have been advanced, making it possible to obtain more sophisticated and higher quality high strength bolted friction joints. Moreover, comparing to the inorganic zinc‐rich paints used at present, organic zinc‐rich paints are more appropriate for using in situ construction. However, since the application conditions of organic coatings have not been specified, it is recommended that a slip test should be carried out separately for each surface preparation to confirm the slip coefficient. In this study, slip tests were carried out on high strength bolted friction joint specimens to investigate the influence of high‐friction organic zinc rich paint film thickness and surface preparation on the slip coefficient. Furthermore, based on the experimental results, a surface preparation that can consistently produce a high slip coefficient is proposed.

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Section: Bolt Axial Forcementioning

confidence: 99%

Effect of Surface Coating Condition on High‐friction Organic Zinc‐rich Paints for HSFB Joints

Zou,

Yamaguchi,

Ueno

et al. 2023

ce papers

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Slipping Behavior and Relaxation Characteristics of Thin-Walled GFRP High-Strength Bolted Friction Joints for Sound Barriers on Bridge Viaducts

Sekimoto

Hayashi

Yamaguchi

et al. 2022

IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation

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<p>This study aimed to clarify the performance of high-strength bolted joints for thin-walled glass-fiber- reinforced polymer (GFRP) members by conducting slip tests and long-term relaxation tests. The parameters of the slip test were the FRP surface treatment, bolt axial force, and bolt hole diameter. Relaxation characteristics might also be affected by variations in fiber content based on differences in production lots. Hence, samples from different production lots were taken. However, in these tests, the influence of all parameters was relatively minimal. One year after tightening, the axial force reduction gradually subsided and tended toward convergence. However, because it is difficult to determine convergence based on temperature changes, long-term measurements will continue. In the slip tests, the highest slip coefficient was obtained when the GFRP was coated with fluoroplastic and the connecting plates were treated with phosphate. This study proposes a design slip coefficient for GFRP high-strength bolted friction joints.</p>

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A Study on Initial Value Setting Method for Relaxation Tests in High Strength Bolted Joints

Cited by 2 publications

References 8 publications

Effect of Surface Coating Condition on High‐friction Organic Zinc‐rich Paints for HSFB Joints

Effect of Surface Coating Condition on High‐friction Organic Zinc‐rich Paints for HSFB Joints

Slipping Behavior and Relaxation Characteristics of Thin-Walled GFRP High-Strength Bolted Friction Joints for Sound Barriers on Bridge Viaducts

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