Detailing question

[newStruc]

This is my first wood job. I need some help.

I have a wood beam atop a steel beam w/ a 3X nailer. The beam is 6.75" wide and the nailer is about 8" wide. The total downward gravity load is abut 15 k.

Am I right in assuming the area to determine the crushing would be 6.75"x8" ?

Would a single Simpson H2.5A and Simpson A35 be sufficient to hold the beam on the nailer since there is no crushing. The beam is about 40' long and has a deflection of 1.25".

 

[civilperson]

Which beam is 6.75" wide, wood or steel? Are they at right angles to each other or aligned? What is the width of the other beam?

 

[jike]

Are you sure this is all downward load? If this is from a roof, then there is probably uplift.

 

[COEngineeer]

If i am not mistaken simpson H2.5 A is a hurricane tie for uplift. Just ask your boss. I am not sure what you are asking really. It is all depend on the finish look too.

Never, but never question engineer's judgement

 

[newStruc]

The beams are at right angles to each other. The beam on top of the steel beam (W12x50) is a wood beam (floor beam 6-3/4 x 27). There is no uplift on the wood beam.

 

[MiketheEngineer]

I am guessing there has to be some kind of horizontal loads - wind or seismic.

Figure those out and you can design a connection. One thought is to drill thru I-beam and use lag bolts?? Or weld brackets to I-beam and lag those.

 

[msquared48]

Weld a metal plate to the top of the flange of the steel beam at both sides of the steel beam and thru-bolt the wood beam.

Mike McCann
MMC Engineering

 

[OldPaperMaker]

newStruc,
You have two things to check on this connection:
1. The bearing stress at the bottom of the GLB and the 3x8 nailer vs Fc perpendicular. The area would be 7.5"x6.75".
2. The load and design of the connection as required in ASCE7-05 Sections 12.1.1, 12.1.2, 12.1.3 & 12.1.4

These Sections in ASCE7 apply to any materials like wood, steel, reinforced concrete, etc. that the structure is framed with.