Program of experimental atmospheric corrosion tests of weathering steels

Křivý, Vít; Kreislová, Kateřina; Urban, Viktor; Vavrušová, Kristýna

doi:10.1515/kom-2015-0007

Cited by 1 publication

(3 citation statements)

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“…The average corrosion thicknesses range from 136.3 µm to 197.7 µm, with a mean value of 161.0 µm. Thus, the criterion reported in the literature, [41,42] defining a maximum average thickness of corrosion products of 400 µm for sufficiently protective patinas, is reliably fulfilled. The value of the coefficient of variation ranges from 0.17 to 0.29, with a mean value of 0.22.…”

Section: Development Of Corrosion Products On Leg Members and Diagonalsmentioning

confidence: 79%

“…It is possible to rehabilitate the connection without dismantling and replacing the splices and bolts with new ones. In order to ensure the longest possible working life of the connection rehabilitated by repair without removing the splices and bolts, it is recommended to use to the following repair procedure [42]:…”

Section: Recommended Methods Of Rehabilitation Of Bolt Joints Of the ...mentioning

confidence: 99%

“…The suitability of this design measure was also verified for operational transmission towers, where crevice sealing was one of the partial steps in the rehabilitation of bolted joints affected by the development of crevice corrosion (see Section 3.2.2). The use of sealants for the renovation of bolted joints is also recommended in the guidelines for the use of steels with increased resistance to atmospheric corrosion [42].…”

Section: Design Solutions For New Transmission Towersmentioning

confidence: 99%

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Corrosion Damage to Joints of Lattice Towers Designed from Weathering Steels

Křivý

2022

Materials

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The article dealt with the load-bearing capacity and durability of power line lattice towers designed from weathering steel. Attention was paid in particular to the bolted lap joints. The article evaluates the static and corrosion performance of bolted lap joints in long-term operating towers, and also presents and evaluates design measures that can be applied in the design of new lattice towers, or in the reconstruction of already operating structures. Power line lattice towers are the most extensive realization of weathering steel in the Czech Republic. On the basis of the inspections carried out to evaluate the working life of the transmission towers in operation, it can be stated that a sufficiently protective layer of corrosion products generally developed on the bearing elements of the transmission towers. However, the development of crevice corrosion at the bolted joints of the leg members is a significant problem. In this paper, the corrosion damage of bolted joints was evaluated considering two basic aspects: (1) the influence of crevice corrosion on the bearing capacity of the bolted joint was evaluated, using experimental testing and based on analytical and numerical calculations; (2) appropriate design measures applicable to the rehabilitation of developed crevice corrosion of in-service structures, or the elimination of crevice corrosion in newly designed lattice towers, was evaluated. Calculation analyses and destructive tests of bolted joints show that the development of corrosion products in the crevice does not have a significant effect on the bearing capacity of the joint, provided that there is no significant corrosion weakening of the structural elements, and bolts of class 8.8 or 10.9 are used. The results of the long-term experimental programme, and the experience from the rehabilitations carried out, show that, thanks to appropriate structural measures, specified in detail in the paper, the long-term reliable behaviour of the lattice towers structures is ensured.

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Section: Development Of Corrosion Products On Leg Members and Diagonalsmentioning

confidence: 79%

Section: Recommended Methods Of Rehabilitation Of Bolt Joints Of the ...mentioning

confidence: 99%

Section: Design Solutions For New Transmission Towersmentioning

confidence: 99%

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