Beam loading for porch:19'6" span

[mrelet]

I am building a roof over a deck to screen-in. Due to the form of the deck, supports are to be 19'6" apart and a beam is required for that span. The beam will carry a distributed load and a point load from two different roofs. [Point load is from the support of another beam] At 30psf load for my area, I calculate that (3)2x12-20' will carry the load with a deflection=0.7 inch. [with L/240=0.975].

My questions are:
(1) will a point load be allowed?
(2) Can I add assurance with a King Post truss and metal tensile members? This type of truss appears simple to site-build. Any recommendations on truss details?

 

[ishvaaag]

If the wood beam has strength enough and small deflection, I don't see any need to go for a truss.

Respect the point load, the main issue is if the loading roof stabilizes enough both the loading and loaded beams, because otherwise separate specific bracing would be required. With a column loading in the beam that would be a necessity, but it is unlikely such is the case when what loads is a beam.

If you doubt, add X bracing in the plane of the roofs to inmovilize the point load point.