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RE: Steel Beam Reinforcing

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Harold,

Since I do not design for steel to yield, I worry very much about what 
the stress is in each part of a built-up beam at each stage of loading.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Harold Sprague wrote:

>>Roger,

You might want to review "Reinforcing Steel Members and the Effects of
Welding", by R. H. R. Tide, AISC Engineering Journal 4th Quarter 1990, and
some of the other works by Tide and Spraragen (referenced in Tide's paper).

Tide discusses at length reinforcing members both unloaded and loaded.  He
also presents several listed references.  After discussing reinforcing
issues with Mr. Tide several years ago and reading various references, my
practice has been to not worry too much about which component of a
reinforced element is stressed to yield and which ones are not stressed as
much.  I look more at the average stresses of the composite member.  As a
result, the initial stress in the parent member is not as important.  It
can't be totally ignored (like buckling), but it is not all that important.

When it comes to anticipated deflections, that is a different issue.

All of these issues came to a head several years ago when I had to reinforce
several trusses and beams that were highly stressed.  I did have occasion to
shore and relieve stress on some elements, but for the most part it was a
non-issue. 

The papers by Tide are much better than this meager synopsis.<<

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