angle bracket

[Buzzbromp]

I am supporting several beams along a concrete wall, with the heaviest load being 23 kips. It was recommended to attach an angle along the wall with one row of bolts. I felt that it would be better to have a support for each beam with 2 rows of bolts to reduce the pullout force, however, I am looking at this scenario for ease of installation.

Looking at an 8x8x3/4 angle with a row of high strength HILTIs 3" from the top, i took the 23 kip load and applied a moment arm of 4", and came up with a Pullout load of 23*4/5 = 17.5 kips (2 gusset plates at the center of the bolts stiffen the angle to pivot at its end). There are 3 bolts near each beam spread out 12" to get full concrete pullout strength, so that amounted to approximately 6 kips/bolt in Pullout and 8 kips/bolt in shear.

I am wondering on stress in the angle. I'm ok with the bending about the horizontal axis parallel the angle, since the stiffener acts as a stem and the plate of the angle as the flange. Do you typically look at bending of the connected leg about the vertical axis for instance? If so, a 6 kip tensile bolt load applied at a distance of 6 inches from the stiffener would be a 36 in-kip moment. Since the angle is only 3/4" thick, its section would be small and a high stress would result. I am wondering if this is extremely conservative as it is more of a 2 side supported plate (3 if two gussets surround bolt) or maybe deflection of this area would just put plate in some sort of tension mode?

Any input is appreciated.

 

[hokie66]

You have to consider all these stresses, but I think your connection works. The critical thing in these connections is the workmanship in installing the anchors.