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concrete filled tube composite section

concrete filled tube composite section

concrete filled tube composite section

(OP)
I have a canopy for a walkway that cantilever's up from a single column, up over the sidewalk.  Because of the loads I cannot get a size the architect likes for the column.  Does anyone know a way to bond concrete that is filled inside a tube in order to increase the bending moment capacity?

RE: concrete filled tube composite section

(OP)
mjohan,
I downloaded the design tables, and a few more.  Thanks for the link.  But at the top of each table states that the loads in the tables are CONCENTRIC.  I have moment and axial load.  

RE: concrete filled tube composite section

I believe the tables will give you the values you will need to do a combined loading calculation on a column.  They do not give you the E composite value but you can back that number out by solving for it using equations E2-1 or E2-2 in section 5-42, chapter E of the AISC manual.  Then refer to chapter H to check for combined stresses.

Good Luck

RE: concrete filled tube composite section

(OP)
mjohan, I have a question about strain combatability, crack control & bonding of the concrete to the tube in bending.  Does anyone have any guidence?

RE: concrete filled tube composite section

dougantholz,

There is a paper by Bradford in ACI Structural Journal #93/2 March /April 1996 pp 229-235 using strain compatability approach for axial and moment strength of short rectangular CFT's. It references a paper by Tomii et al in Japan Concrete Institute proceedings on bond issues.

Unfortunately, I do not have the Tomii paper so I cannot comment on what are significant bond issues.

HTH a little.

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