AISC allows the use of single angles as beam and columns, however, the check is more complicated than for other shapes, see the AISC spec included in the green handbook on page 5-309 also see some worked examples starting on page 3-55. The LRFD version of the spec is available for free download...
I have avoided it in the past, but when you start at a new company and they have "standards" which show these connections, just saying "I don't like it" is not enough, it seems to me the shear buckling equation applies, but every reference I have for the buckling contant value assumes at least...
I have been faced with this problem many times, designers specifying beam to beam connections for equal sized beams with both flanges of the incoming beam coped, with only the flat portion of the web extending to meet the web of the continuous beam, and connected with a double fillet.
I see two...
