STEEL ARCHED LINTEL

[RareBugTX]

Hi all, I would appreciate your input on recommended resource reading for the design of an arched steel lintel.This is for a residential application and small span, 6-8 feet. but it is pretty shallow the arch curvature.


Thanks in advance.

 

[dgkhan]

If it is pretty shallow then horizontal component of load will be less and will not generate enough axial force in arch. Then you may treat it as beam.

 

[RareBugTX]

DGKHAN:

Thanks a lot, now, have you used a threshold figure beyond which you would take into consideration axial?

Thanks.

Rarebug

 

[apsix]

Actually for shallow arches the horizontal component increases, up to the point where it's not practical to resist the compression and flexure is more efficient.

I don't know of a threshold figure, but guess that it would be conservative to design as a beam.

 

[kelowna]

Designing it as a beam would be a good approach as long as you take care of a coupleof issues. First allow lateral movement, the piece does not know it has to behave in a certain way, and if it has lateral support to pick up the thrust, it will push.
Second, deflections have to be OK.

 

[paddingtongreen]

As long as one support is allowed to move laterally, the Bending Moment is that of a beam. I would suggest that the limit is stability, the tendency to buckle out of plane if it gets too high.

Adding to apsix's post, the higher the arch, the smaller the lateral component of the reaction and the greater the movement of the roller needed to relieve it.

Michael.
Timing has a lot to do with the outcome of a rain dance.

 

[apsix]

End supports for lintels in masonry often aren't able to move longitudinally.
My instinct for flat arches is that designing as a beam only will be conservative, as any compressive force due to arching will also be resisted by the masonry.
The safest method would be to design the lintel for both axial force and bending, if a movement joint isn't possible.

 

[asixth]

the lintel will only develop compression if there is sufficient restraint at the ends of the lintel. I would imagine a small movement at the ends of the lintel would be enough transfer from arch action to flexure.

Are you using an angle section.