Buckling of a thin concrete beam

[JStructsteel]

Whats a good check for a beam 21" D x 4" W that is 16' span. I feel that some sort of buckling check should be done?

 

[bugbus]

Why is it so thin?

 

[JStephen]

Roark's Formulas for Stress and Strain includes a design case for thin beams (Case 11, Table 34, P. 544 in the 5th Edition). Not sure how you'd apply to concrete.

 

[JStructsteel]

These are precast lintels supporting brick veneer. So the top will be restrained by tiebacks similar to brick.

Not alot of load either, about 4 feet of brick

 

[Brad805]

The problem for these will be handling. I found an article in ACI recently on this topic. That is on a different computer or I would include a snip of the abstract.

 

[JStructsteel]

they check for handling, Usually they rotate and lift from the top 4 pick points on these long ones.

 

[JAE]

If you are tied back to a back-up wall then buckling shouldn't really be a problem right?

ACI, for concrete beams, used to have a maximum span for beams at 50 x beam width.

 

[JStructsteel]

@ JAE, I am thinking that, would restrained at the very top. @ 50x width, I am ok.

Thanks

 

[Brad805]

4pt lift... It does not seem you have a problem lifting or in-situ.