Sir, when i mode any truss or portal frame in staad, the purlins are being modelled as members connected at the centre of the web part of the top chord member in the truss or in the centre of the web part of the rafter in case of portal frame. But in actual practise they rest on the top chord members. I have also seen many utube video tutorials doing the analysis of industrial sheds considering the purlins to be connected in he centre of the web of the top chord members. isn't there will be problem doing the analysis by considering the same?
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