Eccentric Load on a Precast Wall

[otto_eng]

Hi all,

I have a condition where at one end clt slab is bearing on a glulam beam and at the other end on a steel angle which is bolted to the precast wall. This is a pretty common detail.
Normally I would not get worried about the eccentric load from the clt slab due to the steel angle connection if it was a cast-in wall.
I just would like to get your opinion on this matter.
My approach is to apply the eccentric load as a momeent by considering the rotational point/axis at the bottom left corner of the wall and resist that with the self weight of the wall .
The clt slab is sitting only at one side of the wall so there is no loading on the other side of the wall.

Would you guys do any additional checks ?

Thanks !

 

[KootK]

For the design of the wall, I'd probably take the moment as a concentrated, line moment applied at the level of the CLT slab with an eccentricity that reflects a triangular bearing stress distribution at the CLT support.

The design of the angle connection to the wall would depend on a number of factors including:

1) Whether the vertical angle leg faced up or done.

2) Whether the angle can be assumed to be flexurally continuous with the CLT (probably not).

3) The kind of anchors being used and the potential for prying effects.

 

[Greenalleycat]

My approach is usually to design the angle for a point load somewhere between 2/3 and 100% of the way to the end of the angle
Pretty conservative but gives you a number that helps you sleep at night without changing the design much
Resolving that moment into the bolts is usually where it gets a bit challenging though - I often use unequal angles so that I can get a taller vertical leg for a more favourable lever arm
It's worth considering the rotation of the the angle leg that supports the floor though - a 2-3mm rotation over a 75mm leg could lead to a lot of extra movement in the middle of the floor

I never really track the load further into the panel itself if I am being honest
The moment will generally resolve itself into a tiny shear couple between the connections to various floors or roofs