Your engineer can provide those details. A lot depends on the loads and how he designs the structure. If you are using teleposts you can bend the ears of the post end around the bottom flange (if the flange is not too wide) or clamp the flange and plate together. Sometimes small holes may be drilled through the flange and plate to allow a bolted connection (the engineer would need to design this connection).

Are you sure you are using WF16X30 and not a W16X31? I couldn't find the WF16X30 in my steel manual. The flange width of a W16X31 is 5.525" (so you can see if it is wider than the telepost plate and ears).

A common beam-to-beam connection is a bolted connection (or a welded & bolted connection) where one beam frames into the other beam and its web is bolted to angle iron that is bolted (or welded) to the web of the other beam. If the beams are the same size the flanges of the beam will need to be coped. Again, your engineer can provide these details.

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