Designing Masonry Lintels

[EngDM]

Hey all,

I'm trying to design a masonry lintel for a 4' window opening. It experiencing next to no moment and I'm trying to use a 1 course bond beam. Problem is, 1-10M bar is below pmin but 1-15M is above pbal. I'm designing to the Canadian standards.

Any solutions or references to some more comprehensive examples would be awesome.

Always appreciative.

-D

 

[strucbells]

https://ncma.org/resource/lintel-design-manual-concrete-masonry-and-precast-concrete-lintels/

It's by the US based NCMA but same principles would apply.

 

[MotorCity]

For such a small span, the effect of arching action will most likely support wall itself, leaving only a very small triangle of masonry to be supported by the lintel. I'd bet the lintel will work if unreinforced. If it makes you feel better use one bar.

 

[KootK]

Yeah, it's pretty common to just not worry about that for small scale stuff.

 

[SteveGregory]

The exception would be if there is a concentrated point load within the arching action triangle. For example, a bar joist could be bearing on the masonry wall above the window lintel.

 

[Lomarandil]

One way to have it calc out (for your own comfort or for others) is to design using the #10M bar and a smaller lintel cross section (depth), so that pmin is met. Then the rest of the bond beam is just considered 'along for the ride'.

----
just call me Lo.

 

[dik]

There used to be provisions for using less than min steel if the moment were increased by 1/3, if memory serves.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik