Performance-based durability design of weathering steel bridge

The first steel with improved resistance towards atmospheric corrosion, the so-called weathering steel, was patented in the USA in 1933 and was initially used for coal railway cars, and after that, in building and bridge engineering. Weathering steels show higher corrosion resistance than carbon steels in many types of atmosphere due to their ability to form a compact, stable, adherent and protective patina during the time of exposure. Morphological evaluation of the appearance of the corrosion product layer, together with phase analysis of its components, can enable determination of the type of patina and the degree of protection of the steel. To support the visual assessment of a patina, a check based on the qualitative and quantitative phase analysis of its components may be carried out, and the PAI (Protective Ability Index) can be calculated. The estimation of the corrosion processes on original Polish-made weathering steel (12HNNbA) was carried out on a 30-year-old bridge in Poland. There are some structural problems within the deck derived not only from corrosion but also steel cracking, both inside and outside the boxes, at different heights. Fourteen representative samples of patina were analysed and their phase structures were determined by the X-ray powder diffraction method. The PAIs were determined and analysed.

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A STUDY OF PARTIAL REPAIR PAINTING FOR WEATHERING STEEL BRIDGE

Journal of Japan Society of Civil Engineers Ser A1 (Structural Engineering & Earthquake Engineering (SE/EE)) ◽

10.2208/jscejseee.68.347 ◽

2012 ◽

Vol 68 (2) ◽

pp. 347-355

Keyword(s):

Weathering Steel ◽

Steel Bridge ◽

Partial Repair

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Design Challenges of the Horotiu Paa Bridge - Maximising Structural Efficiency and Economy

IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment ◽

10.2749/stockholm.2016.0814 ◽

2016 ◽

Author(s):

Liam Edwards

Keyword(s):

New Zealand ◽

Weathering Steel ◽

Steel Bridge ◽

Design Development ◽

Economic Prosperity ◽

Total Length ◽

The Government ◽

National Significance ◽

Bridge Spans ◽

Design Challenges

The Horotiu Paa Bridge, also known as the Karapiro Gully Bridge is the largest weathering steel bridge in New Zealand. Construction of the bridge was recently completed in November 2015. The bridge is part of the Cambridge section of the Waikato Expressway in New Zealand. The Waikato Expressway is one of the seven state highways, named the Roads of National Significance, identified by the government as essential to New Zealand's economic prosperity. The bridge spans over the Karapiro Gully with a total length of 200m, consisting of four 50m long equal spans and is 24m wide, servicing 4 lanes of traffic.<p> This paper discusses the design development, key design aspects, innovations and technical challenges for the design of the Horotiu Paa Bridge.

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Development of a Structural Integrity Non-destructive Inspection System for Bridges Made of Weathering Steel

MATEC Web of Conferences ◽

10.1051/matecconf/201927803006 ◽

2019 ◽

Vol 278 ◽

pp. 03006

Author(s):

Björn Torsten Salmen ◽

Marina Knyazeva ◽

Frank Walther

Keyword(s):

Structural Steel ◽

Crack Detection ◽

Structural Integrity ◽

Test Methods ◽

Point Of View ◽

Inspection System ◽

Weathering Steel ◽

Steel Bridge ◽

Electro Magnetic ◽

Non Destructive

Due to the increasing volume of traffic, bridges are exposed to higher loads as it was considered during the planning phase. Therefore, a regular inspection is necessary in order to detect cracks at very early stages. The use of weathering structural steel in bridges, as well as in composite bridge constructions is an alternative to conventional bridges, not only from an economic but also from an ecological point of view, since it is not necessary to apply a corrosion protection layer and renew it during the lifetime of the bridge. Unfortunately, conventional visual inspection or magnetic particle inspection on the weathering steel bridge are hindered by the protective patina and requires development of new test methods. Within the framework of this project, a combined crack detection technique using non-destructive inspection by means of Active Thermography and by Electro-Magnetic Acoustic Transducer (EMAT) were evaluated in laboratory environments and in real conditions on bridge structures made of weathering structural steel.

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118 A Study of Practical Corrosion Diagnosis and Partial Repair Painting of Weathering Steel Bridge

The Proceedings of the Symposium on Evaluation and Diagnosis ◽

10.1299/jsmesed.2011.10.77 ◽

2011 ◽

Vol 2011.10 (0) ◽

pp. 77-80

Author(s):

Takehide AIGA ◽

Atsumi IMAI

Keyword(s):

Weathering Steel ◽

Steel Bridge ◽

Partial Repair

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THE ANTI-CORROSIVE REPAIR METHODS FOR DEGRADED WEATHERING STEEL BRIDGES

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.2020.7(2).str-15 ◽

2020 ◽

Vol 7 (2) ◽

Author(s):

Makoto Ohya ◽

Masamichi Takebe ◽

Nozomu Hirose ◽

Atsumi Imai ◽

Keishi Ochibe

Keyword(s):

Surface Preparation ◽

Steel Bridges ◽

Life Extension ◽

Weathering Steel ◽

Coating Film ◽

Steel Bridge ◽

Repair Method ◽

Good State ◽

Coating Methods ◽

Simple Repair

The existing rust with heavy amounts of salinity or anti-freezing agents on the weathering steel bridge surface can lead to serious durability issues. In the event that the anticorrosion functions of weathering steel bridges do not perform satisfactorily, it is necessary to eliminate the cause or to consider the repair coating and the life extension process. In order to achieve the expected life of the repair coating, it is important to perform the correct surface treatment, appropriate surface preparation (near-white blast cleaning, ISO standard Sa2 1/2 equivalent), and the certain removal of rust containing salinity (50 mg/m2 or below). This study provides state-of-the-art techniques on repair method, which is two repair coating methods and one simple repair method for weathering steel bridges. In 2015, some repair methods, with considerable effectiveness, were carried out to actual weathering steel bridges with undesired rust generation. The investigation of three years after repair coating shows that both repair coating film is confirmed to exhibit good corrosion resistance. The weathering steel surface repaired by simple repair method is also in a good state.

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