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dik said:I've used plastic design for most building type stuff (where applicable) for over 50 years. Still take it seriously.
I have no idea, I can only infer. I haven't spoken to the original engineer and will likely not do so, his calculations are not available. It is a recent build, but I only have the drawings. I'm dealing with the client and the client isn't happy with what has been constructed.dik said:Did the original engineer use plastic design for designing the portal (realising that large portals are not normally prescribed). Are the lateral loads taken by the portal? or by roof diaphragm and X-bracing?
Yeah. Our codes don't seem to be as explicit about the requirements for plastic design. For hot-rolled sections there is some requirements similar to requiring class 1 sections though possibly not as onerous. For cold-rolled I couldn't find any requirement nor any that forbid plastic design using cold rolled thin walled sections in plastic design. (Maybe because it is utter insanity.)dik said:The reason plastic design uses Class 1 sections (at least in Canada) is to prevent this very thing... Plastic design requires that hinges can form and the structure can remain stable until the final hinge occurs.