ACI 318-08 Code Minimum Bars at Column for Two-Way PT Slab are Detailed at Top and Bottom (Not Tension Face only)

Hi,

I am designing a two-way PT slab with ACI 318-08. "CS Code Min. Reinforcement Location" is set to "tension face."

However, when I look at the "Code Minimum Design Top/Bottom Reinforcement" plans, I see the same code minimum bars detailed at the top and bottom in many locations (whereas I would expect to see minimum bars only pver the top of columns). An example is shown below. All code minimum bars in this region are controlled by ACI 318-08 18.9.3.3 (shown below) which only specifies top bars.

I took a look at top/bottom stresses for service level design (shown below), and it does not seem these bars are applied to the tension face only. 

  • Is there a different design envelope used by code minimum design I need to look at?
  • If so, how could I check those top/bottom stress levels to see which face Code Minimum Design uses as the tension face? What plan can show this?
  • If I am looking at the correct stress diagrams, why am I seeing code minimum bars detailed at top and bottom of slab at columns?

 

20191014 L2-L5_grids 5-9_class u_flat slab_EWD.cpt

Top/Bottom Reinforcement

Top/Bottom Stresses (Service Design)

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