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Showing content with the highest reputation on 05/03/20 in Posts

  1. @abbaskhan2294 One book to reference on connection design is: Handbook of Structural Steelwork Connection Design and Details by Akbar R. Tamboli.
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  2. Full and Partial moment resistant connections in steel frame: First thing to note is that steel frame design is all about understanding and mastering joint behaviour and joint design!..... whilst selection of beam or column size is easy.... it’s the joints that determine how the frame will behave under vertical and later loading. Steel column to beam joints are characterised by "stiffness" (rigid joint, semi rigid or pinned) and "strength" (full, partial or pinned). For moment resisting frames the joints are MOSTLY "continuous or full moment resisting". As "semi-continuous or partial moment resisting" joints are discouraged as it relies on rotational stiffness of the joint. This is not easy to do, and thus most codes do not recommend it. I have previously in another post said that one connection that I may design for "partial fixity" is the column to foundation connection - only for lateral sway purposes. Please read that post. In such cases the column is provided with minimum of four bolts spread apart, to assist during erection of the column as first item of frame. With four bolts it will stand up under temporary case (as a cantilever till beams are fixed to it), and often the most onerous loading case. Here are pictorial examples of "full moment resistance connections in steel frames".... detail design of connection is an art. The connections require thick end plates, bolts with large lever arm, and cap and backing plates etc. Hope this helps the understanding the "moment resisting steel frame joint". By the way, I started my career as a structural steel welder, reinforcement steel fixer, then a draughtsman, then Engineer .... thus I have welded and erected many steel frames in my early years! The reason for mentioning this is that Structural Engineers, who have become engineers through gaining degrees and have missed out on practical skills, should make a habit of regularly visiting construction sites regularly, look at the details, talk to the trades men (or women) on site, and gain valuable experience from their see and hear….
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