Heat‐Straightening Prototype Damaged Bridge Girders

Avent, R. Richard; Fadous, George M

doi:10.1061/(asce)0733-9445(1989)115:7(1631)

Cited by 17 publications

(10 citation statements)

References 3 publications

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“…Hence, Avent et al suggested a limit of two damage-repair cycles for steel girders (7). Avent and Fadous subjected a composite W24×76 A36 steel beam to four damage-repair cycles (10). During the fourth cycle, a crack formed on the convex side of the web yield line.…”

Section: Effects Of Multiple Damage-heat Straightening Repairs On Steel Beamsmentioning

confidence: 99%

“…Current guidelines indicate that the same steel girder should not be subjected to more than two damage-heat straightening repairs. This recommendation is based on research conducted by Avent and others (7,10). DOTs have significant interest in developing rational guidelines for evaluating the acceptability of steel girders subjected to multiple damage-repair events (1).…”

mentioning

confidence: 99%

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Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Kowalkowski¹,

Varma

2007

Transportation Research Record: Journal of the Transportation R

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Experimental investigations were conducted to evaluate the effects of multiple cycles of damage followed by heat straightening repair on the structural properties and fracture toughness of steel bridge beams. Six W24×76 (or equivalent) beam specimens made from A7, A588, or A36 steel (two beam specimens of each steel type) were subjected to three cycles of damage followed by heat straightening repair. In each cycle, the beam specimens were damaged statically in weak axis bending and were repaired with several half-depth vee heats and an external restraining force. Material specimens were machined from the flanges of the damaged-repaired beam specimens and tested according to ASTM standards. The material test results indicated that multiple damage-repair cycles did not have a significant influence on the elastic modulus, ultimate stress, and surface hardness of the steels. Multiple damage-repair cycles generally increase the yield stress and reduce the ductility of the steels. The Charpy V-notch fracture toughness of A7 and A36 steel beams repaired with maximum heating temperature (Tmax) equal to 650°C was lower than the fracture toughness of the corresponding undamaged steels. The CVN fracture toughness of A588 steel beams repaired with Tmax equal to 650°C and the A36 steel beam repaired with Tmax equal to 760°C was higher than the fracture toughness of the corresponding undamaged steels. Material specimens that were removed from locations closer to the flange-web interface consistently had lower fracture toughness and ductility.

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Section: Effects Of Multiple Damage-heat Straightening Repairs On Steel Beamsmentioning

confidence: 99%

mentioning

confidence: 99%

Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Kowalkowski¹,

Varma

2007

Transportation Research Record: Journal of the Transportation R

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“…강재는 일반적으로 외부하중을 동반한 가열교정 시 다음과 같은 기계적특성의 변화를 갖는다 (Avent and Fadous, 1989;Varma and Kowalkowski, 2004;Hirohata and Kim, 2008). ① 초기 항복강도 대비 약 20% 강도 증가 ② 초기 인장강도 대비 약 10% 강도 증가 ③ 초기 연신율 대비 약 30% 변형능력 저감 ④ 가열교정 횟수 증가 시 상기 특성이 명확해 짐 Fig.…”

Section: 강재의 가열교정 시 특성unclassified

Variation Analysis of Material Characteristics of Steel through Mechanical Calibration

Kim¹,

Kim²,

Baek³

2020

J. Korean Soc. Hazard Mitig

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Steel elements exhibit varying characteristics during site installation after shop manufacturing. There may be a mix-up owing to unclear management methods for transport, and deformation might occur during field installation. Moreover, the technical basis for evaluating repair methods is narrow. In this study, variations in material properties after performing mechanical calibration were determined for widely used steel types, such as SS400 and SM490, in which thicknesses of 30 mm and less are frequently used on sites. The test results showed that the mechanical calibration in unheated and thermal heating cases increased the yield strength and tensile strength of steel, and the Korea Standard value was satisfied. A yield ratio of approximately 85% or less was obtained, indicating sufficient toughness. In addition, variations owing to thermal heating did not occur when temperatures below 650 °C were applied.

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“…Mechanical straightening is always employed to correct deformation of small structural parts, while flame correction is suitable for large components such as blocks and subassemblies [10]. Flame correction has been widely used due to its simple facility and flexibility [11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Flame correction is a procedure in which a limited amount of heat is provided through the torch to localized deformation areas of welded parts by repeating thermal cycles to cause a gradual deformation [11,12,13,14]. Since metallic materials expand when heated and contract when cooled, the metal plate undergoes shrinkage plastic deformation because the expansion is hindered by the relatively cold surrounding area.…”

Section: Introductionmentioning

confidence: 99%

Quenching Sensitivity of Al-Zn-Mg Alloy after Non-Isothermal Heat Treatment

Dong

Wang

et al. 2019

Materials

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Type Al-Zn-Mg alloy has a wide ranges of application in vehicles, but corrosion resistance and mechanical properties of this alloy after heat treatment or heat straightening limits its utilization. This paper investigates the effect of quenching condition during non-isothermal heat treatment on corrosion behavior and mechanical properties of Al-Zn-Mg alloy. The corrosion resistance of Al-Zn-Mg alloy decreases after non-isothermal heat treatment and the sample after air quenching has the lowest corrosion resistance, the specimens can get better corrosion resistance when suffered 5 min air cooling followed by water quenching process. The evolution of mechanical properties and corrosion resistance of heat-treated specimens is caused by the modification of distribution of precipitates at grain boundary and the microchemistry of precipitates at grain boundary, precipitate-free zones and the matrix.

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Heat‐Straightening Prototype Damaged Bridge Girders

Cited by 17 publications

References 3 publications

Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Effects of Multiple Damage-Heat Straightening Repairs on Steel Beams

Variation Analysis of Material Characteristics of Steel through Mechanical Calibration

Quenching Sensitivity of Al-Zn-Mg Alloy after Non-Isothermal Heat Treatment

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