Single Angle Hanger

[missstructures]

Let me get an opinion on this... I've gotten different answers from different colleagues..

Single angle hanger, connected to the underside of concrete member with post-installed anchor bolts (yikes I know) - hanger steel bar welded to vertical leg of the angle applying tension to the vertical leg

What loads do the bolts need to designed for?

My initial thought was T(bolt) = T + (Tg)/e (tension due to load + added tension due to eccentrically applied load, resolved into a tension/compression)

after talking with other engineers and researching some.. AISC prying action could apply?

So in summary, my questions:
1. What are the resulting loads in the bolts?
2. When using the AISC Prying Action equation, if t > treq, does the tension in the bolts = T/n (no added tension from any eccentricity to be considered)?
3. PCI also has a method in chapter 6, which is slightly different than the 2 above, would this be acceptable for the described condition?
4. Should the angle be checked for bi-axial bending - strong axis bending (angle spanning between the bolts) + torsion (due to load applied at the vertical leg, thus eccentric to the centroid)

TIA for the help.

 

[chicopee]

Show a sketch.

 

[JoshPlumSE]

I could be wrong (because I don't have the reference in front of me). But, I believe the CISC (Canadian steel) handbook has some single angle formulas in their section on prying action.

 

[missstructures]

Here is a simplified sketch.

 

[KootK]

Definitely consider prying. AISC methods are intended for steel on steel so their applicability is limited. If PCI's method is steel on concrete, that sound promising. I would't apply torsion and biaxial provisions. The length of the angle is too short for that stuff to apply.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[manstrom]

Definitely prying. In lieu of AISC equations, you can just dumb it down to a cantilevered beam using statics.

When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.

-R. Buckminster Fuller