Composite HSS Sections 1

[DaveVikingPE]

I'm looking for section properties of concrete-filled HSS and other steel pipes. Is AISC Design Guide 6: Load and Resistance Factor Design of W-Shapes Encased in Concrete / Griffis (1992) applicable?

Any other info is appreciated.

 

[RiBeneke]

In the old days of allowable stress design, I used to obtain the section properties of multiple materials by converting in the 'modular ratio' (ratios of the typical elastic modulus).
I suspect that things get a bit more complicated if designing to the plastic yield or ultimate limit states.

 

[DaveVikingPE]

Thanks RiBeneke!

From a web search, I came across a British (I'm an American, working in the US of A) design manual, entitled "Design Manual for Concrete Columns" that has an excellent section on computing ultimate moments for concrete-filled pipes. Very interesting, indeed.

For my work, though, I started with allowable stress method, using modular ratio, etc. The British method, as explained in the manual (I think I got it off the Corus Construction web site, but alas, I can't remember nor do I have a record of the link...) is intuitive and jibes well with what I'd expect. It also, bless them, has an extensive table of ultimate moments as well as enough caclulated section property data to verify that my own calcs are correct.

I will, though, bite the bullet and pick up the AISC manual I mentioned, eventually...

 

[HochwaltPE]

Design Guide 6 only covers W shapes embedded in concrete. Concrete filled pipes and tubes are covered in the LRFD version of AISC's Manual of Steel Construction.

 

[cv]

In Europe the "Composite Design" is now ruled by EuroCode 4. If this subject is a matter of interest to you, visit the following adress

http://fp.rogerp.plus.com/.

CV

 

[DaveVikingPE]

HochwaltPE,

The HSS chapter of the LRFD manual didn't seem to provide enough theory regarding bending of filled HSS, nor did chapter 4. Mostly it's concerned with these members as columns. Though there are design flexural strengths shown for some filled HSS - but not the one I need to use in an unusual application.

 

[HochwaltPE]

If you're looking for more theoretical background, I've seen a fair amount of research published in this area, mostly in ASCE's Journal of Structural Engineering. You might start with their searchable database at

http://www.pubs.asce.org/cedbsrch.html

. One article that looked promising was:

Composite Action in Concrete Filled Tubes
by Roeder, Cameron, and Brown
Journal of Structural Engineering, Vol. 125, No. 5, May 1999, pp. 477-484

One acronym that might be helpful in your searching is CFT (concrete filled tube).