Design of Horizontal Leg for Steel Angle

[JC456]

When designing the horizontal leg of a shelf angle (hot rolled section) for a line load at the end with the vertical leg bolted to the edge of an RC slab, I would usually design for strength in bending based on the section modulus but could the plastic modulus be used?

 

[KootK]

The plastic modulus could be used. Be aware, however, that it's use implies greater deflection. When I design shelf angles for brick, I don't usually consider the whole length of the horizontal leg to be effective in bending. Instead, I'll assume that only a discrete length in front of the vertical leg bolt/weld is doing all of the work. 8-12" or so. This saves me the effort of looking at the angle in torsion and, in my opinion, is a better reflection of the true behaviour given masonry's tendency to arch over flexible things.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[KootK]

Here's a helpful article: Link

And this AISC design guide: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.