Connection for CMU wall to existing hollow core plank

[Struct_Dre]

Hello All!

I'm working on a wall replacement (someone drove into the side of a building and the wall needs to be replaced). The existing roof is hollow core plank and I need to determine the roof to wall connection. Is it possible to dowel into the existing hollow core? Does anyone have another idea for this connection or a standard detail they can provide for this?

Also, I found that the existing wall does not have vertical bars so I need to add some. Would this require calcs? It seems that providing rebar where there was none wouldn't require lateral analysis, but I'm not sure.

I'm a new engineer so any help is appreciated!

 

[mark_1155]

Bent #4 dowels grouted into hollow core and block is a good detail.

 

[GC_Hopi]

PCI has a handbook for design of hollowcore which has a bunch of typical details. You can find a pdf of the handbook online or try searching precasters websites as they also provide typical details. Of course you should run calc for your specific case but seeing some typical details will let you know what is normally used in these cases

 

[mark_1155]

Here's a good visual. It shows a good way to connect with rebar with your current situation and also shows the plank bearing pads which is used to help distribute the load.

http://www.saramac.com/corporate5540/corporateFiles/243/B-07Layout1(1).pdf?width=640

 

[KootK]

Some questions to help you get the most bang for your buck here:

1) Is your wall running parallel to the planks or perpendicular to them?

2) Will your planks lap over the wall or will the wall bypass the planks?

3) If plank will bear on the wall, what is the plan for temporary shoring etc during wall construction?

4) Can you tell us, or better yet, show us anything about the existing connection between the planks and the wall?

5) Is there existing roofing on the planks that would be expensive to demolish and reinstate locally at this connection?

#5 is probably the most important because, if it would be cost prohibitive to mess with the existing roofing, as it often is, this will preclude many of the common plank to wall connection typologies as most require access to the top of the plank to install rebar, grout cells etc. If this is the case, I'd recommend something like what I've shown below.

HELP! I'd like your help with a thread that I was forced to move to the business issues section where it will surely be seen by next to nobody that matters to me:

http://www.eng-tips.com/viewthread.cfm?qid=456235

 

[jike]

Before developing any kind of detail, you must calculate the loads that need to be transferred. For example: lateral wind load on wall, seismic load on wall, load being transferred from hollow core plank to shear wall, etc.

If loads are small then don't forget to apply minimum requirements.

Once you have the design loads then you can develop an appropriate detail. Don't get the cart before the horse.