Hollowcore plank edge bearing detail concept (sketch) 1

[TroyD]

I am working on a building addition project. Hollowcore plank will run parallel with the existing wall. Please see attached sketch. Is this an acceptable method of securing the new plank to the existing wall? Existing wall is NOT supporting the plank, but I am trying to pattern this detail after the Spancrete typical detail (also attached). Ideally the expansion anchor would be secured to a bond beam. I propose having the 6" CMU courses above grouted solid (if they are not already). Typically the plank edge is supported on the wall, but that does not seem feasible here. Any advice/input is appreciated.

 

[KootK]

1) I can't think of anything better.

2) Do it as intermittent clips rather than a continuous angle. It can be difficult to make a continuous angle follow the plank camber.

3) Like you, I harbour minor concern for the integrity of of the 6" soap pieces that straddle the existing deck. I can't see asking to have the new roof raised or lowered though.

4) I wouldn't do the vertical slip thing here. The slotted holes bind up and allowing for slip complicates the roofing detail.

 

[KootK]

Block wall is singly reinforced I assume? What's the spacing of the joist webs?

 

[TroyD]

KootK,
The double-tee joist webs are 4 ft o/c. I reviewed the original plans from 1968, but they do not indicate the vertical reinforcing size/spacing.

 

[KootK]

Thanks for the info TroyD. I'd like to say that it allowed me to devise a better mouse trap but, sadly, it hasn't.

I like the detail below mechanically but I suspect that you'd take a beating from your contractor for proposing it. You know how you can kinda feel when a detail is too much and you'll ultimately have to back away from it? I have that feeling about this detail. It's fun to talk about though.

 

[JLNJ]

Why connect it at all? No shear transfer?

Have a look at your live load deflections, they may be very small. If so, the flexibility of the roofing movement joint may suffice.

 

[dik]

Can you do something like the attached?

May be easier to fire rate @ about 6' o/c... also depending on the load conditions HC slabs often camber upwards with time. Strap anchor to the HC and round BAR stock for the adjustable 'loop'.

Dik

 

[dik]

This was from a six storey building I did 50 years back with 6" conc walls... just to provide lateral stability to the wall system...

I did the drafting for it, too.

Dik

 

[TroyD]

Thanks for the input. Some good detail options to consider. This project is a 30'x24' addition to a tornado shelter for a mobile/manuf. home community. Needs to be designed to ICC 500 requirements (250 mph wind speed). Basement shelter with a wood-framed community room and offices above. The shelter is below grade, with walk-out on back side, so shouldn't be difficult to satisfy the higher lateral forces on the block walls. But those lateral loads will drive the design of the anchorage into the existing wall.