Relaxation in High-Strength Bolted Connections Using Galvanized Steel

Yang, Jun; DeWolf, John T.

doi:10.1061/(asce)1084-0702(2000)5:2(99)

Cited by 19 publications

(16 citation statements)

References 4 publications

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“…The existing research in which pretension force in high strength bolts is measured either by strain gauges glued to the bolt shank [16] or by strain gauges fitted inside the shank can be divided into those explorations in which no bolt calibration has ever been carried out [17], into explorations in which a force is additionally controlled by strain gauges in a few bolts [11] and explorations in which calibration of every bolt has been performed separately [10], [9]. Experimental research [8] performed on 126 bolts showed that the only thing that was right and acceptable was to calibrate each bolt separately given a big difference in rigidity of bolts that are of various lengths and rigidities in some parts of the bolt, all of which leads to a deviation from measured strains in the bolt compared to nominal ones.…”

Section: Eksperimentalna Kalibracija Sile Prednaprezanja U Visokovredmentioning

confidence: 99%

“…Postojeća istraživanja u kojima se sila prednaprezanja u visokovrednim zavrtnjevima meri pomoću mernih traka zalepljenih na telo zavrtnja [16] ili ugrađenih u njega, mogu se podeliti na: istraživanja u kojima nije vršena kalibracija zavrtnjeva [17], istraživanja u kojima se na malom broju zavrtnjeva sila dodatno kontroliše pomoću mernih ćelija [11] i istraživanja u kojima je izvršena kalibracija svakog zavrtnja ponaosob [10], [9]. Eksperimentalnim istraživanjem [8] na 126 zavrtnjeva, pokazano je da je jedino ispravno i prihvatljivo vršiti kalibraciju svakog zavrtnja, s obzirom na velike razlike u krutosti zavrtnjeva različite dužine, kao i u krutosti delova zavrtnja, što dovodi do odstupanja merenih od nominalnih dilatacija zavrtnja.…”

Section: Introductionunclassified

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Calibration of the bolt pretension by strain gauges vs. FEA

Fric¹,

Pavlović²,

Budjevac³

et al. 2016

Gra mat konstru

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Section: Eksperimentalna Kalibracija Sile Prednaprezanja U Visokovredmentioning

confidence: 99%

Section: Introductionunclassified

Calibration of the bolt pretension by strain gauges vs. FEA

Fric¹,

Pavlović²,

Budjevac³

et al. 2016

Gra mat konstru

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“…). 500시간 정도 경과 후에는 축력저하 현상이 멈추어 일정축력을 유지하고, 도장표면의 경우에는 1,000 시간까지 축력저하 현상이 멈춘다 (Frank,1981;Yang, 2000;Kulak, 2001). 볼트 접합표면에 도장이 도포되었을 경우 강재의 탄성계수와 비교할 때 상대적으로 도장재료의 탄성계수가 결정적인 요인이기 때문에, 다른 외적 요인보다 훨씬 빠르게 도막 크리프가 진행되며 볼트 축력저하의 지배 적인 요인이 된다 (Frank,1981;Kulak, 2001;AIJ 2003).…”

Section: 서 론unclassified

Evaluation on Clamping Force of High Strength Bolts By Coating Parameters of Faying Surfaces

Nah¹,

Lee²

2012

Corrosion Science and Technology

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Clamping force of a high strength bolt is reduced by a certain period of time after the initial setup. In case of special treatments on faying surfaces such as protective coating, clamping force is relaxed more severely. Tests for slip critical joints subject to various faying surface parameters were conducted. Five different surface treatments were tested including mill scale surface, blast surface, rust surface and coated surfaces. Each specimen was composed of F10T M20 of high strength bolts and steel plates. Based on the result of slip coefficient test, blast treatment surface showed 0.59, rust treatment surface showed 0.54 and inorganic zinc treatment surface exhibited 0.44. Clean mill treatment surface and red lead paint treatment surface were 0.23, 0.21 respectively. It is identified that the slip coefficient in Korean structural design guide should be determined for various surface conditions. Subsequently from long term relaxation test of ASTM A 490 high strength bolts, relaxation of no-coated surfaces such as blast, clean mill, rust treatment, the loss of initial clamping load was 10.5%, 13.6% and 7.9% for 1,000 hours, while the loss of initial clamping force was reached as 15.0%, 18.7% more than the required redundancy 10% in case of inorganic zinc and red lead painted treatment. It is required that the limit of relaxation on coated faying surface should be established separately for various surfaces.

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“…The working mechanism of the high-quality bolt joint used on steel bridges is the slipcritical mechanism [1], [2], [3]. This mechanism relies on the clamping force of high-quality bolt pretensioning, which causes friction between the surface of the jointed steel plates so that forces on steel bridge elements will be held by the friction force [4], [5].…”

Section: Introductionmentioning

confidence: 99%

The Response of The Friction High Strength Bolt Connection for Steel Truss Bridge

Rosyidah¹,

Irawan²,

Sukarno³

et al. 2019

Proceedings of the Proceedings of the 1st International Conference on Engineering, Science, and Commerce, ICESC 2019, 18-19 Oct

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High strength bolt joints used on the steel truss bridge are the mechanism of slip-critical. This mechanism relies on the clamping force of high strength bolt pretension led to friction between the surface of the tied steel plates, so the forces acting on the elements of the steel bridge held by the friction. In order to get the ratio of the pretensioning and observe the mode of failure, then the experiments in the laboratory and the simulation using software were carried out. The method used in this experiment was trial and error so that the value of the pretensioning of high strength bolts needed to reach the maximum axial load press was retrieved. There are four types of the surface coating of the tied steel; milling, grit-blast cleaning, coat of primer paint by grit-blast cleaning and coat of hot-dip galvanized given chromate treatment. The results obtained show that the ratio of the pretensioning on high strength bolt between the simulation and the experiments do not look different; the range is 0.97. The pattern of failure that occurs in the simulation tends to be more regular and quite small in comparison with the experimental results.

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Relaxation in High-Strength Bolted Connections Using Galvanized Steel

Cited by 19 publications

References 4 publications

Calibration of the bolt pretension by strain gauges vs. FEA

Calibration of the bolt pretension by strain gauges vs. FEA

Evaluation on Clamping Force of High Strength Bolts By Coating Parameters of Faying Surfaces

The Response of The Friction High Strength Bolt Connection for Steel Truss Bridge

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