the connection with a long slotted hole together and a thick cover plate FE-analysis of the preliminary experiments was used to endorse conclusions from the experiments. Keywords:bolted connection, friction connection, weathering steel, slotted hole, Tension Control Bolt. 1. Introduction Corus Construction & Industrial - NPL2 Weathering steel bridges Contents 3 Introduction 5 Weathering steel 6 Benefits of weathering steel 8 Limitations on use 13 Availability 14 Appearance 16 Design and detailing 19 Fabrication and installation 21 Inspection, monitoring and maintenance 22 Remedial measures 23 References 1. Above:Slochd Beag Bridge Inverness, Scotland 2. Left
crevice effects on HSFG bolted connections can be minimised by limiting the bolt spacing and edge distance, using flexible cover plates, and sealing the edges of the joint. Crevices at the intersections of cross bracings should be avoided by using a packing plate the same thickness as the web stiffener, and a single HSFG bolt through all three pieces. Dissimilar Metals American Galvanizers AssociationWhen connecting hot-dip galvanized steel to weathering steel, for instance using galvanized bolts on weathering steel beams, the zinc will initially sacrifice itself to protect the weathering material until the protective layer of rust patina develops. Once the rust patina is in place, it will prevent further sacrificial action from the zinc. Preferred Practices for Steel Bridge Design, Fabrication If it is acceptable for the location, use weathering steel (A 709 Grades 50W and HPS 70W) left unpainted. FHWA Technical Advisory T 5140.22 and Section . 188.8.131.52. of this document provide guidelines on acceptable locations. Some TxDOT districts object to the use of weathering steel, so obtain district approval before using weathering steel in a
Lark, R J, 2004, HSFG bolted connections using weathering steel materials, Proceedings of the Institution of Civil Engineers, Bridge Engineering 157 (BE2). NHSS 20:National Highways Sector Schemes for Quality Management in Highway Works, 20. The Execution of Steelwork in Transportation Infrastructure Assets, Issue 5 (9001:2015), 30 Structural Bolts Feb-26-09 DONE - FastenalBolt X has a material cross sectional area of 0.417 square inches. Structural bolts are specifically designed for use with heavy hex nuts in the connection of structural members (as opposed to tapped holes). weathering steel that offers atmospheric corrosion The improved and complete Instruction Manual for High Strength Friction Grip (HSFG) bolts are well established as economical and efficient devices for connecting structural steel. The basic rules for their use are laid out in BS 4604 and BS 5950, by The Steel Construction Institute (SCI) and the British Constructional Steelwork Association (BCSA), and the developing European Structural Standards.
P. Lambert, in Sustainability of Construction Materials (Second Edition), 2016 6.4.1 Optimising and accelerating patination. The surface patina formed on weathering steel in atmospheric conditions provides protection against further corrosion, a benefit which the corrosion products formed on carbon steel do not provide. The corrosion protection provided by the weathering steel patina is due to Weathering steel - SteelConstructionfo HSFG bolted connections using weathering steel materials, R.J.Lark, Bridge Engineering 157 Issue BE2, Thomas Telford, London, June 2004. NA+A1:2012 to BS EN 1993-2:2006, UK National Annex to Eurocode 3:Design of structures. Steel Bridges. BSI What bolts should I specify with Weathering Steel?For structural applications (in the US), the most common bolt for weathering steel is ASTM A 325 Type 3. Type 1 is a plain steel bolt that can be galvanized, but in this situation the zinc in the galvanizing will quickly be used trying to protect the rest of the structure. Update for British bolts
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