Just started my first post here, an

[johndeng]

Just started my first post here, and found my answer quickly. here comes another.
When we anchor masonry walls to the spandrel beams, anchors only go between the mortar of the blocks so we wont break the blocks. Or we do need to break the block to anchor them? I know to anchor the ledger, we would need to break into the wall blocks for anchorage.

Thanks again!

 

[msquared48]

Normally drill into the block for either post-set or pre-set anchors. In either case the cell containing the anchor must be grouted, whether prior to or after the installation of the anchor, sometimes to the ground.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[johndeng]

Thanks msquared48 for your help.
I just feel all wall anchors from mfr manual insert into mortar only. I know all will be grouted (maybe better with a bond beam?), just not sure we need to break into blocks every 2 or 3 feet.

 

[frv]

Hilti HY20 may be used to post install anchors into hollow cells. Not saying it's necessarily a good idea, but it may be used.

M^2 is right, tough. Drill in.

 

[abusementpark]

When in doubt, drill and grout.

 

[BAretired]

There are several ways of anchoring masonry walls to spandrel beams without drilling or breaking blocks. Provide a cross section of the situation you are considering and someone may be able to suggest an adequate detail.

BA

 

[johndeng]

to BA,
Just a typical new masonry wall, we always tie them to spandrel. I feel when we build for new wall, we may not need to drill in. I know for existing block wall or for ledger on new block wall, I need to drill in.

 

[dik]

Can you use adjustable anchors?... a U embedded in the mortar joint and an L on it's side attached to the spandrel?

Dik

 

[BAretired]

Is the wall aligned with the beam or offset? Provide a sketch.

BA

 

[johndeng]

to BA,
we always have our wall 5" offset from center line of spandrel as sketched.

 

[BAretired]

You don't specify the anchor material, but I think your detail looks fine. I have seen it used before. The anchor is usually a 1.5"x3/16" steel strap but it could be heavier if required.

BA

 

[johndeng]

BA, thanks.
But I am not experienced for wall anchors. I know they are either straps or strings, but I am wondering they will be put into block first, and then weld to beam later. or otherwise. I feel it's hard to weld later, but it's impossible to put into block later too.
And also how usually you do, drill into block or insert to grout?

 

[BAretired]

The usual way is for the strap ties to be shop welded to the beam. They must be aligned with the block coursing. The mason builds the wall up to the bond beam, making sure that the wall ties will work with his coursing. He then places the bond beam reinforcement and pours concrete, thus tying the steel beam to the wall.

In your detail, the steel beam is prevented from deflecting after it is connected to the wall. I prefer an adjustable connection, permitting the beam to deflect relative to the wall. Various details have been proposed to accommodate this requirement.

In a fire, steel columns will expand much more rapidly than masonry walls, so vertical adjustment is desirable. This may be accomplished by slotted arrangements which allow wall ties to move relative to the steel.


BA