Minimum Steel in Flanged Concrete Beam

[BLMedcalf]

Anyone,

Seismic Design Manual, Vol 3. Page 293.

Why do they check Asmin for the negative moment on the section (bw = 24"), but not on the positive moment (bw = 52")?

ACI 21.3.2.1 says: At any section of a flexural member,

except as provided in 10.5.3, for top as well as for bottom

reinforcement, the amount of reinforcement shall

not be less than that given by Eq. (10-3) but not less

than 200bwd /fy, and the reinforcement ratio, ρ, shall

not exceed 0.025. At least two bars shall be provided

continuously both top and bottom.

Any thoughts? If they used the minimum steel, they would need 5.72 in2.

 

[MOOK]

When you check the min positive reft you should include the negative reft with you which is already more than Asmin.

I hope this helps.

BTW, Do you have any thoughts about my thread "Column Stability"?