The Engineering Projects

sir,
I need to know the length of anchor rod or triangular steel rod which is to be weld on the base plate and which will get inside the concrete columns. we are making an industrial shed 30ft*40ft on 4in steel pipes. please suggest me sir.the fabricator is telling that the clamp/anchor rod should be 2ft i.e four pieces of steel angle/clamp/anchor rod each 2ft length.please suggest me economically and not be compromising with the strength of the shed. please suggest.
thANK YOU

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