Concrete tank axial tension in walla

[sidnum]

Hi,

Designing a concrete tank where shear forces in long walls equal direct tension in short walls and vice-versa. I am designing to British Standards or Eurocode preferably. I know I must add the reinforcement required for the direct tension to the reinforcement required for horizontal moments but I am struggling to figure how to find the area of steel required for DT. Is it simply Area required = Tension/0.87fyk and applying half the area obtained to each face? (fyk = strength of rebar 500N/mm2 and 0.87 is factor applied to rebar strength in calculating bennding steel required for all you non-Europeans)

Cheers

 

[a7x1984]

[URL unfurl="true"]http://www.scribd.com/doc/54823464/PCA-Rectangular-Concrete-Tanks[/url]

I use this reference for finding unit shears and moments in rectangular tanks. As far as resistance factors and load factors for Eurocode, I can not help. I am sure you use a rectangular compression stress block theory, so I am not sure what is complicated once you have performed the structural analysis.

If I got paid for every hour I worked, I'd be a wealthy man.

 

[a7x1984]

I didn't read your post correctly. Direct tension reduction factors aren't addressed in the American Concrete Code either. Is this element a pile or brace in tension?

If I got paid for every hour I worked, I'd be a wealthy man.

 

[sidnum]

No it's just a rectangular concrete tank, with horizontal tension in the walls

 

[ukengineer58]

You can generally divide the tension requirements by the two faces, if it is all tied and anchored sufficiently. You will then have one rc layer in direct tension and one in tension from tension and moment. You should verify uls strength and cracking caused by these effects.